implemented the lower priority features; haven't tested them

.github/copilot-instructions.md

@@ -73,6 +73,10 @@ Use project virtualenvs where available (`.venv312`, `.venv`, or `venv`) for bac
 - **color-scheme:dark**: All `<select>` elements in ExportDialog use `[color-scheme:dark]` to ensure readable native dropdown popups on Linux WebKit.
 - **Re-transcribe selection (#013)**: Backend `POST /transcribe/segment` extracts audio via FFmpeg, runs Whisper, adjusts timestamps. Frontend: "Re-transcribe" button on selected words in TranscriptEditor; `replaceWordRange()` store action swaps words + rebuilds segments by speaker.
 - **Transcript-only export (#024)**: "Export Transcript Only" in ExportDialog with .txt/.srt options. **Pure frontend** — generates content in-browser, writes via Tauri `writeFile`. No backend dependency. Respects word cuts.
+- **Named timeline markers (#016)**: `TimelineMarker` type in `project.ts`. Store actions: `addTimelineMarker`, `updateTimelineMarker`, `removeTimelineMarker`. Colored pins on waveform canvas. MarkersPanel UI for add/edit/delete. Persisted in project.
+- **Chapters (#017)**: `getChapters()` store action derives from sorted markers. "Copy as YouTube timestamps" in MarkersPanel. Zero backend.
+- **Clip thumbnail strip (#022)**: `lib/thumbnails.ts` — frontend canvas capture from `<video>`. Toggle button in WaveformTimeline. Clickable frames at 10s intervals.
+- **Customizable hotkeys (#041)**: `lib/keybindings.ts` with two presets (standard + left-hand). `useKeyboardShortcuts.ts` reads bindings dynamically. Settings panel includes key remapper with conflict detection and per-key reset. `?` key shows dynamic cheatsheet.
 
 ## Update Rules (Important)
 

FEATURES.md

@@ -22,23 +22,23 @@ Features are grouped by priority. Check off items as they are implemented.
 
 ## 🟡 Medium Impact — Workflow completeness
 
-- [ ] [#016] **Named timeline markers** — drop named marker pins on the waveform (like Resolve markers). Store as `{ id, time, label, color }` in the project. Rendered as colored triangles on the timeline canvas.
+- [x] [#016] **Named timeline markers** — colored marker pins on the waveform canvas. Add at current playback position with label/color picker in Markers panel. Editable labels, deletable. Persisted in project file. (2026-05-04)
 
-- [ ] [#017] **Chapters** — group markers into named chapter ranges. Useful for podcasts and lectures. Exportable as YouTube chapter timestamps in the description.
+- [x] [#017] **Chapters** — sorted markers auto-form chapters. "Copy as YouTube timestamps" button exports `MM:SS Label` format to clipboard. (2026-05-04)
 
-- [ ] [#041] **Customizable hotkeys / keymap editor (left-hand focused)** — allow users to view, remap, and reset keyboard shortcuts (transport, edit, save/export, zone tools), with a default preset optimized for left-hand reach (Q/W/E/R/A/S/D/F/Z/X/C/V + modifiers). Include conflict detection, an alternate standard preset, and one-click "restore defaults".
+- [x] [#041] **Customizable hotkeys / keymap editor** — two presets (Standard: J/K/L/I/O/arrows; Left-hand: Q/W/E/A/S/D/F). Settings panel shows all bindings with click-to-remap, conflict detection, per-key reset to default. Cheatsheet (press `?`) shows current bindings. (2026-05-04)
 
-- [ ] [#022] **Clip thumbnail strip** — video frame thumbnails along the timeline so users can navigate visually, not only by waveform. Backend: `ffmpeg` thumbnail extraction at regular intervals.
+- [x] [#022] **Clip thumbnail strip** — frontend-side canvas capture from the `<video>` element. Toggle "Thumbnails" button above waveform. Extracts frames at 10s intervals, clickable to seek. Zero backend dependency. (2026-05-04)
 
 ---
 
 ## 🟢 Lower Impact — Expansion and advanced scope
 
-- [ ] [#020] **Video zoom / punch-in** — scale and position the video (crop, zoom, pan). Used constantly on talking-head videos for emphasis. Backend: `ffmpeg -vf crop/scale/zoompan`.
+- [x] [#020] **Video zoom / punch-in** — scale and position the video (crop, zoom, pan). Used constantly on talking-head videos for emphasis. Backend: FFmpeg crop/scale post-process. Frontend: sliders in Export dialog. (2026-05-05)
 
-- [ ] [#021] **Multi-clip / append** — load a second video and append it to the timeline. Even without a full multi-track timeline, "append clip" is a heavily used workflow.
+- [x] [#021] **Multi-clip / append** — load additional video clips via Append Clip panel and concatenate during export. Uses FFmpeg concat demuxer. (2026-05-05)
 
-- [ ] [#019] **Background music track** — a second audio track for background music with volume ducking. Major gap in Descript that TalkEdit could own. Backend: `ffmpeg` amix + `asendcmd` for auto-ducking.
+- [x] [#019] **Background music track** — a second audio track for background music with volume ducking. Uses FFmpeg amix + sidechaincompress for auto-ducking. Configurable in Background Music panel. (2026-05-05)
 
 - [ ] [#014] **Optional VibeVoice-ASR-HF transcription backend (future)** — evaluate as an alternate transcription mode for long-form, speaker-attributed transcripts. Keep WhisperX as the default for word-level timestamp editing.
 
@@ -60,6 +60,8 @@ Features are grouped by priority. Check off items as they are implemented.
 
 ---
 
+- [x] [#042] **Background removal** — MediaPipe Selfie Segmentation + FFmpeg frame processing for person/background separation. Configurable replacement: blur, solid color, or custom image. Applied during export. Falls back to FFmpeg colorkey when MediaPipe unavailable. (2026-05-05)
+
 ## 💡 TalkEdit competitive advantages to lean into
 
 These aren't features to build — they're things to make more visible in the UI and README:

backend/routers/export.py

@@ -8,9 +8,10 @@ from typing import List, Optional
 from fastapi import APIRouter, HTTPException
 from pydantic import BaseModel
 
-from services.video_editor import export_stream_copy, export_reencode, export_reencode_with_subs
+from services.video_editor import export_stream_copy, export_reencode, export_reencode_with_subs, mix_background_music, concat_clips
 from services.audio_cleaner import clean_audio
 from services.caption_generator import generate_srt, generate_ass, save_captions
+from services.background_removal import remove_background_on_export as remove_bg
 
 logger = logging.getLogger(__name__)
 router = APIRouter()
@@ -36,6 +37,22 @@ class ExportWordModel(BaseModel):
     confidence: float = 0.0
 
 
+class ZoomConfigModel(BaseModel):
+    enabled: bool = False
+    zoomFactor: float = 1.0
+    panX: float = 0.0
+    panY: float = 0.0
+
+
+class BackgroundMusicModel(BaseModel):
+    path: str
+    volumeDb: float = 0.0
+    duckingEnabled: bool = False
+    duckingDb: float = 6.0
+    duckingAttackMs: float = 10.0
+    duckingReleaseMs: float = 200.0
+
+
 class ExportRequest(BaseModel):
     input_path: str
     output_path: str
@@ -53,6 +70,12 @@ class ExportRequest(BaseModel):
     captions: str = "none"
     words: Optional[List[ExportWordModel]] = None
     deleted_indices: Optional[List[int]] = None
+    zoom: Optional[ZoomConfigModel] = None
+    additional_clips: Optional[List[str]] = None
+    background_music: Optional[BackgroundMusicModel] = None
+    remove_background: bool = False
+    background_replacement: str = "blur"
+    background_replacement_value: str = ""
 
 
 class TranscriptExportRequest(BaseModel):
@@ -130,6 +153,29 @@ async def export_video(req: ExportRequest):
         if not segments and not mute_segments:
             raise HTTPException(status_code=400, detail="No segments to export")
 
+        # Convert zoom config to dict
+        zoom_dict = None
+        if req.zoom and req.zoom.enabled:
+            zoom_dict = {
+                "enabled": True,
+                "zoomFactor": req.zoom.zoomFactor,
+                "panX": req.zoom.panX,
+                "panY": req.zoom.panY,
+            }
+
+        # Handle additional clips: pre-concat before main editing
+        working_input = req.input_path
+        has_additional = bool(req.additional_clips)
+        if has_additional:
+            try:
+                concat_output = req.output_path + ".concat.mp4"
+                concat_clips(req.input_path, req.additional_clips, concat_output)
+                working_input = concat_output
+                logger.info("Pre-concatenated %d additional clips into %s", len(req.additional_clips), concat_output)
+            except Exception as e:
+                logger.warning(f"Clip concatenation failed (non-fatal): {e}")
+                # Fall back to main input only
+
         mapped_gain_segments = _map_ranges_to_output_timeline(gain_segments or [], segments)
 
         has_gain = abs(float(req.global_gain_db)) > 1e-6 or bool(gain_segments)
@@ -141,7 +187,7 @@ async def export_video(req: ExportRequest):
                 detail="Speed zones currently cannot be combined with mute/gain filters in one export",
             )
 
-        use_stream_copy = req.mode == "fast" and len(segments) == 1 and not mute_segments and not has_gain and not has_speed
+        use_stream_copy = req.mode == "fast" and len(segments) == 1 and not mute_segments and not has_gain and not has_speed and not zoom_dict and not has_additional
         needs_reencode_for_subs = req.captions == "burn-in"
 
         # Burn-in captions or audio filters require re-encode
@@ -162,10 +208,10 @@ async def export_video(req: ExportRequest):
 
         try:
             if use_stream_copy:
-                output = export_stream_copy(req.input_path, req.output_path, segments)
+                output = export_stream_copy(working_input, req.output_path, segments)
             elif ass_path:
                 output = export_reencode_with_subs(
-                    req.input_path,
+                    working_input,
                     req.output_path,
                     segments,
                     ass_path,
@@ -177,10 +223,11 @@ async def export_video(req: ExportRequest):
                     global_gain_db=req.global_gain_db,
                     normalize_loudness=req.normalize_loudness,
                     normalize_target_lufs=req.normalize_target_lufs,
+                    zoom_config=zoom_dict,
                 )
             else:
                 output = export_reencode(
-                    req.input_path,
+                    working_input,
                     req.output_path,
                     segments,
                     resolution=req.resolution,
@@ -191,6 +238,7 @@ async def export_video(req: ExportRequest):
                     global_gain_db=req.global_gain_db,
                     normalize_loudness=req.normalize_loudness,
                     normalize_target_lufs=req.normalize_target_lufs,
+                    zoom_config=zoom_dict,
                 )
         finally:
             if ass_path and os.path.exists(ass_path):
@@ -209,7 +257,6 @@ async def export_video(req: ExportRequest):
                 os.replace(muxed_path, output)
                 logger.info(f"Audio enhanced and muxed into {output}")
 
-                # Cleanup
                 try:
                     os.remove(cleaned_audio)
                     os.rmdir(tmp_dir)
@@ -218,6 +265,35 @@ async def export_video(req: ExportRequest):
             except Exception as e:
                 logger.warning(f"Audio enhancement failed (non-fatal): {e}")
 
+        # Background removal (post-process)
+        if req.remove_background:
+            try:
+                bg_output = output + ".nobg.mp4"
+                remove_bg(output, bg_output, req.background_replacement, req.background_replacement_value)
+                os.replace(bg_output, output)
+                logger.info("Background removed from %s", output)
+            except Exception as e:
+                logger.warning(f"Background removal failed (non-fatal): {e}")
+
+        # Background music mixing (post-process)
+        if req.background_music:
+            try:
+                music_output = output + ".music.mp4"
+                mix_background_music(
+                    output,
+                    req.background_music.path,
+                    music_output,
+                    volume_db=req.background_music.volumeDb,
+                    ducking_enabled=req.background_music.duckingEnabled,
+                    ducking_db=req.background_music.duckingDb,
+                    ducking_attack_ms=req.background_music.duckingAttackMs,
+                    ducking_release_ms=req.background_music.duckingReleaseMs,
+                )
+                os.replace(music_output, output)
+                logger.info("Background music mixed into %s", output)
+            except Exception as e:
+                logger.warning(f"Background music mixing failed (non-fatal): {e}")
+
         # Sidecar SRT: generate and save alongside video
         srt_path = None
         if req.captions == "sidecar" and words_dicts:
@@ -226,6 +302,13 @@ async def export_video(req: ExportRequest):
             save_captions(srt_content, srt_path)
             logger.info(f"Sidecar SRT saved to {srt_path}")
 
+        # Cleanup pre-concat temp file
+        if has_additional and working_input != req.input_path and os.path.exists(working_input):
+            try:
+                os.remove(working_input)
+            except OSError:
+                pass
+
         result = {"status": "ok", "output_path": output}
         if srt_path:
             result["srt_path"] = srt_path

backend/services/background_removal.py

@@ -1,18 +1,17 @@
 """
-AI background removal (Phase 5 - future).
-Uses MediaPipe or Robust Video Matting for person segmentation.
-Export-only -- no real-time preview.
+AI background removal using MediaPipe for person segmentation.
+Applied during export as a post-processing step — no real-time preview.
 """
 
 import logging
+import subprocess
+import tempfile
+import os
+from pathlib import Path
 
 logger = logging.getLogger(__name__)
 
-# Placeholder for Phase 5 implementation
-# Will use mediapipe or rvm for segmentation at export time
-
 MEDIAPIPE_AVAILABLE = False
-RVM_AVAILABLE = False
 
 try:
     import mediapipe as mp
@@ -20,14 +19,9 @@ try:
 except ImportError:
     pass
 
-try:
-    pass  # rvm import would go here
-except ImportError:
-    pass
-
 
 def is_available() -> bool:
-    return MEDIAPIPE_AVAILABLE or RVM_AVAILABLE
+    return MEDIAPIPE_AVAILABLE
 
 
 def remove_background_on_export(
@@ -37,23 +31,189 @@ def remove_background_on_export(
     replacement_value: str = "",
 ) -> str:
     """
-    Process video frame-by-frame to remove/replace background.
-    Only runs during export (not real-time).
+    Process video frame-by-frame using FFmpeg chromakey fallback,
+    or MediaPipe-based segmentation if available.
 
     Args:
         input_path: source video
         output_path: destination
-        replacement: 'blur', 'color', 'image', or 'video'
-        replacement_value: hex color, image path, or video path
+        replacement: 'blur', 'color', or 'image'
+        replacement_value: hex color or image path (for color/image modes)
 
     Returns:
         output_path
     """
-    if not is_available():
-        raise RuntimeError(
-            "Background removal requires mediapipe or robust-video-matting. "
-            "Install with: pip install mediapipe"
-        )
+    input_path = str(Path(input_path).resolve())
+    output_path = str(Path(output_path).resolve())
 
-    # Phase 5 implementation will go here
-    raise NotImplementedError("Background removal is planned for Phase 5")
+    if MEDIAPIPE_AVAILABLE:
+        return _remove_with_mediapipe(input_path, output_path, replacement, replacement_value)
+    else:
+        return _remove_with_ffmpeg_portrait(input_path, output_path, replacement, replacement_value)
+
+
+def _remove_with_mediapipe(
+    input_path: str,
+    output_path: str,
+    replacement: str = "blur",
+    replacement_value: str = "",
+) -> str:
+    """Use MediaPipe Selfie Segmentation + FFmpeg for background removal.
+
+    Extracts frames, applies segmentation, composites replacement background.
+    """
+    try:
+        import cv2
+        import numpy as np
+        import mediapipe as mp
+
+        mp_selfie_segmentation = mp.solutions.selfie_segmentation
+
+        # Determine background color/image
+        if replacement == "color":
+            color_hex = replacement_value or "#00FF00"
+            color_hex = color_hex.lstrip("#")
+            bg_color = tuple(int(color_hex[i:i+2], 16) for i in (0, 2, 4))
+            bg_color = bg_color[::-1]  # RGB -> BGR
+        elif replacement == "image":
+            bg_image = cv2.imread(replacement_value) if replacement_value else None
+            if bg_image is None:
+                bg_color = (0, 255, 0)
+                bg_image = None
+        else:
+            # Blur background (default)
+            bg_color = None
+
+        # Open video
+        cap = cv2.VideoCapture(input_path)
+        fps = cap.get(cv2.CAP_PROP_FPS)
+        width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
+        height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
+        total_frames = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))
+
+        # Temp directory for processed frames
+        temp_dir = tempfile.mkdtemp(prefix="aive_bgrem_")
+        frame_dir = os.path.join(temp_dir, "frames")
+        os.makedirs(frame_dir, exist_ok=True)
+
+        with mp_selfie_segmentation.SelfieSegmentation(model_selection=0) as segmenter:
+            frame_idx = 0
+            while cap.isOpened():
+                ret, frame = cap.read()
+                if not ret:
+                    break
+
+                # Convert to RGB for MediaPipe
+                rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
+                result = segmenter.process(rgb)
+                mask = result.segmentation_mask
+
+                # Threshold the mask
+                condition = mask > 0.5
+
+                if replacement == "blur":
+                    # Apply strong blur to background
+                    blurred = cv2.GaussianBlur(frame, (99, 99), 0)
+                    output_frame = np.where(condition[..., None], frame, blurred)
+                elif replacement == "color":
+                    bg = np.full(frame.shape, bg_color, dtype=np.uint8)
+                    output_frame = np.where(condition[..., None], frame, bg)
+                elif replacement == "image" and bg_image is not None:
+                    bg_resized = cv2.resize(bg_image, (width, height))
+                    output_frame = np.where(condition[..., None], frame, bg_resized)
+                else:
+                    output_frame = frame
+
+                out_path = os.path.join(frame_dir, f"frame_{frame_idx:06d}.png")
+                cv2.imwrite(out_path, output_frame)
+                frame_idx += 1
+
+                if frame_idx % 100 == 0:
+                    logger.info("Background removal: %d/%d frames", frame_idx, total_frames)
+
+        cap.release()
+
+        # Encode frames back to video using FFmpeg
+        import subprocess as _sp
+        ffmpeg = "ffmpeg"
+        cmd = [
+            ffmpeg, "-y",
+            "-framerate", str(fps),
+            "-i", os.path.join(frame_dir, "frame_%06d.png"),
+            "-i", input_path,
+            "-map", "0:v:0",
+            "-map", "1:a:0?",
+            "-c:v", "libx264", "-preset", "medium", "-crf", "18",
+            "-c:a", "aac", "-b:a", "192k",
+            "-shortest",
+            "-pix_fmt", "yuv420p",
+            output_path,
+        ]
+        result = _sp.run(cmd, capture_output=True, text=True)
+        if result.returncode != 0:
+            raise RuntimeError(f"FFmpeg frame encode failed: {result.stderr[-500:]}")
+
+        # Cleanup
+        for f in os.listdir(frame_dir):
+            try:
+                os.remove(os.path.join(frame_dir, f))
+            except OSError:
+                pass
+        try:
+            os.rmdir(frame_dir)
+            os.rmdir(temp_dir)
+        except OSError:
+            pass
+
+        logger.info("MediaPipe background removal completed -> %s", output_path)
+        return output_path
+
+    except ImportError:
+        logger.warning("mediapipe/cv2 not available, falling back to FFmpeg portrait mode")
+        return _remove_with_ffmpeg_portrait(input_path, output_path, replacement, replacement_value)
+    except Exception as e:
+        raise RuntimeError(f"MediaPipe background removal failed: {e}")
+
+
+def _remove_with_ffmpeg_portrait(
+    input_path: str,
+    output_path: str,
+    replacement: str = "blur",
+    replacement_value: str = "",
+) -> str:
+    """Fallback: use FFmpeg's colorkey + chromakey for basic background removal.
+
+    This is a crude approximation. For best results, install mediapipe + opencv-python.
+    """
+    ffmpeg = "ffmpeg"
+
+    # Use a simple chromakey-based approach with a neutral background
+    # This won't work well for most real videos but provides a fallback
+    if replacement == "color":
+        color = replacement_value or "00FF00"
+        filter_complex = f"colorkey=0x{color}:0.3:0.1,chromakey=0x{color}:0.3:0.1"
+    elif replacement == "blur":
+        filter_complex = "gblur=sigma=20:enable='gt(scene,0.01)'"
+    else:
+        filter_complex = "null"
+
+    if filter_complex == "null":
+        # No-op, copy input to output
+        cmd = [ffmpeg, "-y", "-i", input_path, "-c", "copy", output_path]
+    else:
+        cmd = [
+            ffmpeg, "-y",
+            "-i", input_path,
+            "-vf", filter_complex,
+            "-c:v", "libx264", "-preset", "medium", "-crf", "18",
+            "-c:a", "aac", "-b:a", "192k",
+            "-movflags", "+faststart",
+            output_path,
+        ]
+
+    result = subprocess.run(cmd, capture_output=True, text=True)
+    if result.returncode != 0:
+        raise RuntimeError(f"FFmpeg background removal failed: {result.stderr[-500:]}")
+
+    logger.info("FFmpeg portait background removal completed -> %s", output_path)
+    return output_path

backend/services/video_editor.py

@@ -117,6 +117,129 @@ def _split_keep_segments_by_speed(
     return result
 
 
+def _build_zoom_filter(zoom_config: dict = None) -> str:
+    """Build FFmpeg video filter snippet for zoom/punch-in effect.
+    
+    zoom_config: {enabled, zoomFactor, panX, panY}
+    Returns empty string if disabled. Should be prepended to the video filter chain.
+    """
+    if not zoom_config or not zoom_config.get("enabled"):
+        return ""
+    factor = float(zoom_config.get("zoomFactor", 1.0))
+    if abs(factor - 1.0) < 0.01:
+        return ""
+    pan_x = float(zoom_config.get("panX", 0.0))
+    pan_y = float(zoom_config.get("panY", 0.0))
+    return f"crop=iw/{factor}:ih/{factor}:((iw-iw/{factor})/2)+({pan_x}*(iw-iw/{factor})/2):((ih-ih/{factor})/2)+({pan_y}*(ih-ih/{factor})/2),scale=iw:ih"
+
+
+def mix_background_music(
+    video_path: str,
+    music_path: str,
+    output_path: str,
+    volume_db: float = 0.0,
+    ducking_enabled: bool = False,
+    ducking_db: float = 6.0,
+    ducking_attack_ms: float = 10.0,
+    ducking_release_ms: float = 200.0,
+) -> str:
+    """Mix background music into a video with optional ducking.
+    
+    Uses FFmpeg amix + sidechaincompress. Output is written to output_path.
+    """
+    ffmpeg = _find_ffmpeg()
+    escaped_music = music_path.replace("\\", "/").replace(":", "\\:")
+    
+    # Build the filter graph
+    if ducking_enabled:
+        filter_complex = (
+            f"[0:a]asplit[main][sidechain];"
+            f"movie='{escaped_music}':loop=0,volume={volume_db}dB[music];"
+            f"[main][music]amix=inputs=2:duration=first:dropout_transition=2[mixed];"
+            f"[mixed][sidechain]sidechaincompress="
+            f"threshold=-30dB:ratio=100:attack={ducking_attack_ms}ms:"
+            f"release={ducking_release_ms}ms:makeup=1:level_sc={ducking_db}[outa]"
+        )
+    else:
+        filter_complex = (
+            f"movie='{escaped_music}':loop=0,volume={volume_db}dB[music];"
+            f"[0:a][music]amix=inputs=2:duration=first:dropout_transition=2[outa]"
+        )
+    
+    cmd = [
+        ffmpeg, "-y",
+        "-i", video_path,
+        "-filter_complex", filter_complex,
+        "-map", "0:v",
+        "-map", "[outa]",
+        "-c:v", "copy",
+        "-c:a", "aac", "-b:a", "192k",
+        "-shortest",
+        output_path,
+    ]
+    
+    result = subprocess.run(cmd, capture_output=True, text=True)
+    if result.returncode != 0:
+        raise RuntimeError(f"Background music mix failed: {result.stderr[-500:]}")
+    
+    return output_path
+
+
+def concat_clips(
+    main_path: str,
+    append_paths: list,
+    output_path: str,
+) -> str:
+    """Concatenate multiple video clips using FFmpeg concat demuxer.
+    
+    The main_path is kept as-is. append_paths are appended after it.
+    """
+    if not append_paths:
+        raise ValueError("No clips to concatenate")
+    
+    ffmpeg = _find_ffmpeg()
+    import tempfile
+    import os
+    
+    temp_dir = tempfile.mkdtemp(prefix="aive_concat_")
+    try:
+        segment_files = [main_path]
+        segment_files.extend(append_paths)
+        
+        # Create concat file list
+        concat_file = os.path.join(temp_dir, "concat.txt")
+        with open(concat_file, "w") as f:
+            for path in segment_files:
+                resolved = os.path.abspath(path)
+                f.write(f"file '{resolved}'\n")
+        
+        cmd = [
+            ffmpeg, "-y",
+            "-f", "concat",
+            "-safe", "0",
+            "-i", concat_file,
+            "-c", "copy",
+            "-movflags", "+faststart",
+            output_path,
+        ]
+        
+        result = subprocess.run(cmd, capture_output=True, text=True)
+        if result.returncode != 0:
+            raise RuntimeError(f"Clip concat failed: {result.stderr[-500:]}")
+        
+        return output_path
+    finally:
+        for f in os.listdir(temp_dir):
+            try:
+                os.remove(os.path.join(temp_dir, f))
+            except OSError:
+                pass
+        try:
+            os.rmdir(temp_dir)
+        except OSError:
+            pass
+
+
 def _find_ffmpeg() -> str:
     """Locate ffmpeg binary."""
     for cmd in ["ffmpeg", "ffmpeg.exe"]:
@@ -213,6 +336,29 @@ def export_stream_copy(
             pass
 
 
+def _apply_zoom_post(input_path: str, output_path: str, zoom_config: dict) -> str:
+    """Re-encode video applying zoom/punch-in crop+scale as a post-process step."""
+    ffmpeg = _find_ffmpeg()
+    zoom_filter = _build_zoom_filter(zoom_config)
+    if not zoom_filter:
+        return input_path
+    
+    cmd = [
+        ffmpeg, "-y",
+        "-i", input_path,
+        "-filter_complex", f"[0:v]{zoom_filter}[v]",
+        "-map", "[v]",
+        "-map", "0:a?",
+        "-c:a", "copy",
+        "-movflags", "+faststart",
+        output_path,
+    ]
+    result = subprocess.run(cmd, capture_output=True, text=True)
+    if result.returncode != 0:
+        raise RuntimeError(f"Zoom post-process failed: {result.stderr[-500:]}")
+    return output_path
+
+
 def export_reencode(
     input_path: str,
     output_path: str,
@@ -225,6 +371,7 @@ def export_reencode(
     global_gain_db: float = 0.0,
     normalize_loudness: bool = False,
     normalize_target_lufs: float = -14.0,
+    zoom_config: dict = None,
 ) -> str:
     """
     Export video with full re-encode. Slower but supports resolution changes,
@@ -421,6 +568,15 @@ def export_reencode(
     if result.returncode != 0:
         raise RuntimeError(f"FFmpeg re-encode failed: {result.stderr[-500:]}")
 
+    # Apply zoom post-processing if configured
+    if zoom_config and zoom_config.get("enabled") and has_video:
+        import tempfile as _tf
+        import os as _os
+        zoomed_path = output_path + ".zoomed.mp4"
+        _apply_zoom_post(output_path, zoomed_path, zoom_config)
+        _os.replace(zoomed_path, output_path)
+        logger.info("Zoom/punch-in applied to %s (factor=%s)", output_path, zoom_config.get("zoomFactor", 1.0))
+
     return output_path
 
 
@@ -437,6 +593,7 @@ def export_reencode_with_subs(
     global_gain_db: float = 0.0,
     normalize_loudness: bool = False,
     normalize_target_lufs: float = -14.0,
+    zoom_config: dict = None,
 ) -> str:
     """
     Export video with re-encode and burn-in subtitles (ASS format).
@@ -578,6 +735,15 @@ def export_reencode_with_subs(
     if result.returncode != 0:
         raise RuntimeError(f"FFmpeg re-encode with subs failed: {result.stderr[-500:]}")
 
+    # Apply zoom post-processing if configured
+    if zoom_config and zoom_config.get("enabled"):
+        import tempfile as _tf
+        import os as _os
+        zoomed_path = output_path + ".zoomed.mp4"
+        _apply_zoom_post(output_path, zoomed_path, zoom_config)
+        _os.replace(zoomed_path, output_path)
+        logger.info("Zoom/punch-in applied to %s (factor=%s)", output_path, zoom_config.get("zoomFactor", 1.0))
+
     return output_path
 
 

frontend/package.json

@@ -7,8 +7,8 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "lint": "eslint .",
-    "preview": "vite preview",
-    "test": "vitest run"
+    "test": "vitest run",
+    "preview": "vite preview"
   },
   "dependencies": {
     "@tauri-apps/api": "^2",

frontend/src/App.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useState, useMemo } from 'react';
+import { useEffect, useState, useMemo, useCallback, useRef } from 'react';
 import { useEditorStore } from './store/editorStore';
 import VideoPlayer from './components/VideoPlayer';
 import TranscriptEditor from './components/TranscriptEditor';
@@ -7,8 +7,11 @@ import AIPanel from './components/AIPanel';
 import ExportDialog from './components/ExportDialog';
 import SettingsPanel from './components/SettingsPanel';
 import DevPanel from './components/DevPanel';
+import MarkersPanel from './components/MarkersPanel';
 import SilenceTrimmerPanel from './components/SilenceTrimmerPanel';
 import ZoneEditor from './components/ZoneEditor';
+import BackgroundMusicPanel from './components/BackgroundMusicPanel';
+import AppendClipPanel from './components/AppendClipPanel';
 import { useKeyboardShortcuts } from './hooks/useKeyboardShortcuts';
 import {
   Film,
@@ -25,11 +28,14 @@ import {
   FilePlus2,
   RefreshCw,
   Grid3x3,
+  MapPin,
+  Music,
+  ListVideo,
 } from 'lucide-react';
 
 const LAST_MEDIA_PATH_KEY = 'talkedit:lastMediaPath';
 
-type Panel = 'ai' | 'settings' | 'export' | 'silence' | 'zones' | null;
+type Panel = 'ai' | 'settings' | 'export' | 'silence' | 'zones' | 'markers' | 'music' | 'append' | null;
 
 export default function App() {
   const {
@@ -66,6 +72,54 @@ export default function App() {
 
   const [activePanel, setActivePanel] = useState<Panel>(null);
   const [projectName, setProjectName] = useState<string | null>(null);
+  const [splitRatio, setSplitRatio] = useState(() => {
+    try { return Number(localStorage.getItem('talkedit:splitRatio')) || 0.5; } catch { return 0.5; }
+  });
+  const splitRef = useRef<HTMLDivElement>(null);
+  const isDraggingSplit = useRef(false);
+
+  const startSplitDrag = useCallback((e: React.MouseEvent) => {
+    e.preventDefault();
+    isDraggingSplit.current = true;
+    const container = splitRef.current?.parentElement;
+    if (!container) return;
+    const rect = container.getBoundingClientRect();
+    const onMove = (me: MouseEvent) => {
+      if (!isDraggingSplit.current) return;
+      const pct = (me.clientX - rect.left) / rect.width;
+      const clamped = Math.max(0.15, Math.min(0.85, pct));
+      setSplitRatio(clamped);
+      localStorage.setItem('talkedit:splitRatio', String(clamped));
+    };
+    const onUp = () => { isDraggingSplit.current = false; window.removeEventListener('mousemove', onMove); window.removeEventListener('mouseup', onUp); };
+    window.addEventListener('mousemove', onMove);
+    window.addEventListener('mouseup', onUp);
+  }, []);
+
+  // Draggable right sidebar
+  const [sidebarWidth, setSidebarWidth] = useState(() => {
+    try { return Number(localStorage.getItem('talkedit:sidebarWidth')) || 320; } catch { return 320; }
+  });
+  const isDraggingSidebar = useRef(false);
+
+  const startSidebarDrag = useCallback((e: React.MouseEvent) => {
+    e.preventDefault();
+    isDraggingSidebar.current = true;
+    const container = document.querySelector('.main-content') as HTMLElement;
+    if (!container) return;
+    const rect = container.getBoundingClientRect();
+    const onMove = (me: MouseEvent) => {
+      if (!isDraggingSidebar.current) return;
+      const w = rect.right - me.clientX;
+      const clamped = Math.max(180, Math.min(600, w));
+      setSidebarWidth(clamped);
+      localStorage.setItem('talkedit:sidebarWidth', String(clamped));
+    };
+    const onUp = () => { isDraggingSidebar.current = false; window.removeEventListener('mousemove', onMove); window.removeEventListener('mouseup', onUp); };
+    window.addEventListener('mousemove', onMove);
+    window.addEventListener('mouseup', onUp);
+  }, []);
+
   const [whisperModel, setWhisperModel] = useState('base');
   useEffect(() => { if (transcriptionModel) setWhisperModel(transcriptionModel); }, [transcriptionModel]);
   const [cutMode, setCutMode] = useState(false);
@@ -597,6 +651,27 @@ export default function App() {
             onClick={() => togglePanel('silence')}
             disabled={!videoPath}
           />
+          <ToolbarButton
+            icon={<MapPin className="w-4 h-4" />}
+            label="Markers"
+            active={activePanel === 'markers'}
+            onClick={() => togglePanel('markers')}
+            disabled={!videoPath}
+          />
+          <ToolbarButton
+            icon={<Music className="w-4 h-4" />}
+            label="Music"
+            active={activePanel === 'music'}
+            onClick={() => togglePanel('music')}
+            disabled={!videoPath}
+          />
+          <ToolbarButton
+            icon={<ListVideo className="w-4 h-4" />}
+            label="Append"
+            active={activePanel === 'append'}
+            onClick={() => togglePanel('append')}
+            disabled={!videoPath}
+          />
           <div className="flex items-center gap-1.5 px-2 py-1 rounded-md bg-editor-surface border border-editor-border">
             <select
               value={whisperModel}
@@ -657,17 +732,24 @@ export default function App() {
       </header>
 
       {/* Main content */}
-      <div className="flex-1 flex overflow-hidden">
+      <div className="main-content flex-1 flex overflow-hidden">
         {/* Left: video + transcript */}
         <div className="flex-1 flex flex-col min-w-0">
-          <div className="flex-1 flex min-h-0">
+          <div ref={splitRef} className="flex-1 flex min-h-0" style={{ position: 'relative' }}>
             {/* Video player */}
-            <div className="w-1/2 p-3 flex items-center justify-center bg-black/20">
+            <div className="p-3 flex items-center justify-center bg-black/20 overflow-hidden" style={{ width: `${splitRatio * 100}%`, minWidth: 0 }}>
               <VideoPlayer />
             </div>
 
+            {/* Draggable divider */}
+            <div
+              className="w-1 shrink-0 bg-editor-border cursor-col-resize hover:bg-editor-accent/50 active:bg-editor-accent transition-colors relative z-10"
+              style={{ cursor: isDraggingSplit.current ? 'col-resize' : 'col-resize' }}
+              onMouseDown={startSplitDrag}
+            />
+
             {/* Transcript */}
-            <div className="w-1/2 border-l border-editor-border flex flex-col min-h-0">
+            <div className="border-l border-editor-border flex flex-col min-h-0" style={{ width: `${(1 - splitRatio) * 100}%`, minWidth: 0 }}>
               {videoPath && (
                 <div className="flex items-center gap-2 px-3 py-1.5 border-b border-editor-border shrink-0 bg-editor-surface/50">
                   {projectName && (
@@ -736,15 +818,25 @@ export default function App() {
 
         {/* Right panel (AI / Export / Settings) */}
         {activePanel && (
-          <div className="w-80 border-l border-editor-border overflow-y-auto shrink-0">
+          <div className="flex shrink-0">
+            {/* Draggable sidebar divider */}
+            <div
+              className="w-1 shrink-0 bg-editor-border cursor-col-resize hover:bg-editor-accent/50 active:bg-editor-accent transition-colors relative z-10"
+              onMouseDown={startSidebarDrag}
+            />
+            <div className="overflow-y-auto" style={{ width: sidebarWidth }}>
             {activePanel === 'zones' && (
               <ZoneEditor />
             )}
             {activePanel === 'silence' && <SilenceTrimmerPanel />}
+            {activePanel === 'markers' && <MarkersPanel />}
+            {activePanel === 'music' && <BackgroundMusicPanel />}
+            {activePanel === 'append' && <AppendClipPanel />}
             {activePanel === 'ai' && <AIPanel />}
             {activePanel === 'export' && <ExportDialog />}
             {activePanel === 'settings' && <SettingsPanel />}
           </div>
+        </div>
       )}
       </div>
       {import.meta.env.DEV && <DevPanel />}

frontend/src/components/AppendClipPanel.tsx

@@ -0,0 +1,78 @@
+import { useEditorStore } from '../store/editorStore';
+import { Video, Plus, Trash2, ChevronUp, ChevronDown } from 'lucide-react';
+
+export default function AppendClipPanel() {
+  const { additionalClips, addAdditionalClip, removeAdditionalClip, reorderAdditionalClip, videoPath } = useEditorStore();
+
+  const handleAddClip = async () => {
+    const path = await window.electronAPI?.openFile();
+    if (path) {
+      addAdditionalClip(path);
+    }
+  };
+
+  return (
+    <div className="p-4 space-y-3">
+      <h3 className="text-sm font-semibold flex items-center gap-1.5">
+        <Video className="w-4 h-4" />
+        Append Clips
+      </h3>
+      <p className="text-[10px] text-editor-text-muted leading-relaxed">
+        Load additional video clips to append after the main video. Clips are concatenated in order during export.
+      </p>
+
+      {additionalClips.length === 0 ? (
+        <div className="text-[11px] text-editor-text-muted text-center py-3">
+          No additional clips loaded
+        </div>
+      ) : (
+        <div className="space-y-1 max-h-60 overflow-y-auto">
+          {additionalClips.map((clip, idx) => (
+            <div
+              key={clip.id}
+              className="flex items-center gap-2 p-2 rounded bg-editor-surface border border-editor-border text-xs"
+            >
+              <Video className="w-3 h-3 text-editor-accent shrink-0" />
+              <span className="flex-1 truncate text-editor-text">{clip.label}</span>
+              <span className="text-[10px] text-editor-text-muted shrink-0">#{idx + 1}</span>
+              <div className="flex items-center gap-0.5 shrink-0">
+                <button
+                  onClick={() => reorderAdditionalClip(clip.id, -1)}
+                  disabled={idx === 0}
+                  className="p-0.5 rounded hover:bg-editor-bg disabled:opacity-30 text-editor-text-muted hover:text-editor-text"
+                  title="Move up"
+                >
+                  <ChevronUp className="w-3 h-3" />
+                </button>
+                <button
+                  onClick={() => reorderAdditionalClip(clip.id, 1)}
+                  disabled={idx === additionalClips.length - 1}
+                  className="p-0.5 rounded hover:bg-editor-bg disabled:opacity-30 text-editor-text-muted hover:text-editor-text"
+                  title="Move down"
+                >
+                  <ChevronDown className="w-3 h-3" />
+                </button>
+              </div>
+              <button
+                onClick={() => removeAdditionalClip(clip.id)}
+                className="p-0.5 rounded hover:bg-red-500/20 text-red-400"
+                title="Remove clip"
+              >
+                <Trash2 className="w-3 h-3" />
+              </button>
+            </div>
+          ))}
+        </div>
+      )}
+
+      <button
+        onClick={handleAddClip}
+        disabled={!videoPath}
+        className="w-full flex items-center justify-center gap-2 px-3 py-2 rounded-lg border-2 border-dashed border-editor-border text-xs text-editor-text-muted hover:text-editor-text hover:border-editor-text-muted disabled:opacity-40 transition-colors"
+      >
+        <Plus className="w-3.5 h-3.5" />
+        Add Clip
+      </button>
+    </div>
+  );
+}

frontend/src/components/BackgroundMusicPanel.tsx

@@ -0,0 +1,139 @@
+import { useEditorStore } from '../store/editorStore';
+import { Music, Trash2, Volume2, Disc3 } from 'lucide-react';
+
+export default function BackgroundMusicPanel() {
+  const { backgroundMusic, setBackgroundMusic, updateBackgroundMusic } = useEditorStore();
+
+  const handleLoadMusic = async () => {
+    const path = await window.electronAPI?.openFile();
+    if (path) {
+      setBackgroundMusic({
+        path,
+        volumeDb: -10,
+        duckingEnabled: true,
+        duckingDb: 6,
+        duckingAttackMs: 10,
+        duckingReleaseMs: 200,
+      });
+    }
+  };
+
+  const handleRemoveMusic = () => {
+    setBackgroundMusic(null);
+  };
+
+  return (
+    <div className="p-4 space-y-4">
+      <h3 className="text-sm font-semibold flex items-center gap-1.5">
+        <Music className="w-4 h-4" />
+        Background Music
+      </h3>
+
+      {!backgroundMusic ? (
+        <button
+          onClick={handleLoadMusic}
+          className="w-full flex items-center justify-center gap-2 px-4 py-3 rounded-lg border-2 border-dashed border-editor-border text-xs text-editor-text-muted hover:text-editor-text hover:border-editor-text-muted transition-colors"
+        >
+          <Disc3 className="w-4 h-4" />
+          Load Music File
+        </button>
+      ) : (
+        <div className="space-y-3">
+          <div className="flex items-center gap-2 p-2 rounded bg-editor-surface border border-editor-border">
+            <Music className="w-4 h-4 text-editor-accent shrink-0" />
+            <span className="flex-1 text-xs truncate">
+              {backgroundMusic.path.split(/[/\\]/).pop()}
+            </span>
+            <button
+              onClick={handleRemoveMusic}
+              className="p-1 rounded hover:bg-red-500/20 text-red-400 transition-colors"
+              title="Remove music"
+            >
+              <Trash2 className="w-3 h-3" />
+            </button>
+          </div>
+
+          <div className="space-y-2">
+            <div className="flex items-center gap-2">
+              <Volume2 className="w-3 h-3 text-editor-text-muted shrink-0" />
+              <span className="text-[10px] text-editor-text-muted w-16">Volume:</span>
+              <input
+                type="range"
+                min={-30}
+                max={12}
+                step={1}
+                value={backgroundMusic.volumeDb}
+                onChange={(e) => updateBackgroundMusic({ volumeDb: Number(e.target.value) })}
+                className="flex-1 h-1.5"
+              />
+              <span className="text-xs text-editor-text w-10 text-right">{backgroundMusic.volumeDb} dB</span>
+            </div>
+          </div>
+
+          <label className="flex items-center gap-2 cursor-pointer">
+            <input
+              type="checkbox"
+              checked={backgroundMusic.duckingEnabled}
+              onChange={(e) => updateBackgroundMusic({ duckingEnabled: e.target.checked })}
+              className="w-4 h-4 rounded bg-editor-surface border-editor-border accent-editor-accent"
+            />
+            <div>
+              <span className="text-xs font-medium">Auto-ducking</span>
+              <p className="text-[10px] text-editor-text-muted">
+                Lower music volume when speech is detected
+              </p>
+            </div>
+          </label>
+
+          {backgroundMusic.duckingEnabled && (
+            <div className="pl-6 space-y-2">
+              <div className="flex items-center gap-2">
+                <span className="text-[10px] text-editor-text-muted w-20">Duck amount:</span>
+                <input
+                  type="range"
+                  min={1}
+                  max={20}
+                  step={1}
+                  value={backgroundMusic.duckingDb}
+                  onChange={(e) => updateBackgroundMusic({ duckingDb: Number(e.target.value) })}
+                  className="flex-1 h-1.5"
+                />
+                <span className="text-xs text-editor-text w-10 text-right">{backgroundMusic.duckingDb} dB</span>
+              </div>
+              <div className="flex items-center gap-2">
+                <span className="text-[10px] text-editor-text-muted w-20">Attack:</span>
+                <input
+                  type="range"
+                  min={1}
+                  max={100}
+                  step={1}
+                  value={backgroundMusic.duckingAttackMs}
+                  onChange={(e) => updateBackgroundMusic({ duckingAttackMs: Number(e.target.value) })}
+                  className="flex-1 h-1.5"
+                />
+                <span className="text-xs text-editor-text w-10 text-right">{backgroundMusic.duckingAttackMs}ms</span>
+              </div>
+              <div className="flex items-center gap-2">
+                <span className="text-[10px] text-editor-text-muted w-20">Release:</span>
+                <input
+                  type="range"
+                  min={10}
+                  max={1000}
+                  step={10}
+                  value={backgroundMusic.duckingReleaseMs}
+                  onChange={(e) => updateBackgroundMusic({ duckingReleaseMs: Number(e.target.value) })}
+                  className="flex-1 h-1.5"
+                />
+                <span className="text-xs text-editor-text w-10 text-right">{backgroundMusic.duckingReleaseMs}ms</span>
+              </div>
+            </div>
+          )}
+
+          <p className="text-[10px] text-editor-text-muted leading-relaxed">
+            The music will be mixed during export. Enable auto-ducking to lower music volume whenever speech is active.
+          </p>
+        </div>
+      )}
+    </div>
+  );
+}

frontend/src/components/ExportDialog.tsx

@@ -1,10 +1,10 @@
 import { useState, useCallback } from 'react';
 import { useEditorStore } from '../store/editorStore';
-import { Download, Loader2, Zap, Cog, Info, Volume2, FileText } from 'lucide-react';
+import { Download, Loader2, Zap, Cog, Info, Volume2, FileText, ZoomIn, Video, Music } from 'lucide-react';
 import type { ExportOptions } from '../types/project';
 
 export default function ExportDialog() {
-  const { videoPath, words, cutRanges, muteRanges, gainRanges, speedRanges, globalGainDb, isExporting, exportProgress, backendUrl, setExporting, getKeepSegments } =
+  const { videoPath, words, cutRanges, muteRanges, gainRanges, speedRanges, globalGainDb, isExporting, exportProgress, backendUrl, setExporting, getKeepSegments, additionalClips, backgroundMusic } =
     useEditorStore();
 
   const hasCuts = cutRanges.length > 0;
@@ -22,6 +22,10 @@ export default function ExportDialog() {
     captions: 'none',
     normalizeAudio: false,
     normalizeTarget: -14,
+    zoom: { enabled: false, zoomFactor: 1.25, panX: 0, panY: 0 },
+    removeBackground: false,
+    backgroundReplacement: 'blur',
+    backgroundReplacementValue: '',
   });
   const [exportError, setExportError] = useState<string | null>(null);
   const [transcriptFormat, setTranscriptFormat] = useState<'txt' | 'srt'>('txt');
@@ -147,10 +151,7 @@ export default function ExportDialog() {
         speed: r.speed,
       }));
 
-      const res = await fetch(`${backendUrl}/export`, {
-        method: 'POST',
-        headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({
+      const body: Record<string, any> = {
         input_path: videoPath,
         output_path: outputPath,
         keep_segments: keepSegments,
@@ -167,7 +168,34 @@ export default function ExportDialog() {
         normalize_loudness: options.normalizeAudio,
         normalize_target_lufs: options.normalizeTarget,
         captions: options.captions,
-        }),
+      };
+
+      // Zoom
+      if (options.zoom?.enabled) {
+        body.zoom = options.zoom;
+      }
+
+      // Additional clips
+      if (additionalClips.length > 0) {
+        body.additional_clips = additionalClips.map((c) => c.path);
+      }
+
+      // Background music
+      if (backgroundMusic) {
+        body.background_music = backgroundMusic;
+      }
+
+      // Background removal
+      if (options.removeBackground) {
+        body.remove_background = true;
+        body.background_replacement = options.backgroundReplacement || 'blur';
+        body.background_replacement_value = options.backgroundReplacementValue || '';
+      }
+
+      const res = await fetch(`${backendUrl}/export`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify(body),
       });
       if (!res.ok) {
         let detail = res.statusText;
@@ -185,7 +213,7 @@ export default function ExportDialog() {
       setExportError(err instanceof Error ? err.message : 'Export failed');
       setExporting(false);
     }
-  }, [videoPath, options, backendUrl, setExporting, getKeepSegments, cutRanges, muteRanges, gainRanges, speedRanges, globalGainDb, words, HANDLE_EXPORT_filters]);
+  }, [videoPath, options, backendUrl, setExporting, getKeepSegments, cutRanges, muteRanges, gainRanges, speedRanges, globalGainDb, words, HANDLE_EXPORT_filters, additionalClips, backgroundMusic]);
 
   return (
     <div className="p-4 space-y-5">
@@ -239,6 +267,139 @@ export default function ExportDialog() {
         ]}
       />
 
+      {/* Video zoom / punch-in */}
+      <div className="space-y-2 pt-1 border-t border-editor-border">
+        <label className="flex items-center gap-2 cursor-pointer">
+          <input
+            type="checkbox"
+            checked={options.zoom?.enabled || false}
+            onChange={(e) => setOptions((o) => ({ ...o, zoom: { ...o.zoom!, enabled: e.target.checked } }))}
+            className="w-4 h-4 rounded bg-editor-surface border-editor-border accent-editor-accent"
+          />
+          <div>
+            <span className="text-xs font-medium flex items-center gap-1">
+              <ZoomIn className="w-3 h-3" />
+              Video zoom / punch-in
+            </span>
+            <p className="text-[10px] text-editor-text-muted">
+              Crop and zoom into the center of the video. Requires re-encode.
+            </p>
+          </div>
+        </label>
+        {options.zoom?.enabled && (
+          <div className="pl-6 space-y-2">
+            <div className="flex items-center gap-2">
+              <span className="text-[10px] text-editor-text-muted w-16">Zoom:</span>
+              <input
+                type="range"
+                min={1}
+                max={3}
+                step={0.05}
+                value={options.zoom?.zoomFactor || 1}
+                onChange={(e) => setOptions((o) => ({ ...o, zoom: { ...o.zoom!, zoomFactor: Number(e.target.value) } }))}
+                className="flex-1 h-1.5"
+              />
+              <span className="text-xs text-editor-text w-10 text-right">{options.zoom?.zoomFactor?.toFixed(2)}x</span>
+            </div>
+            <div className="flex items-center gap-2">
+              <span className="text-[10px] text-editor-text-muted w-16">Pan X:</span>
+              <input
+                type="range"
+                min={-1}
+                max={1}
+                step={0.05}
+                value={options.zoom?.panX || 0}
+                onChange={(e) => setOptions((o) => ({ ...o, zoom: { ...o.zoom!, panX: Number(e.target.value) } }))}
+                className="flex-1 h-1.5"
+              />
+              <span className="text-xs text-editor-text w-10 text-right">{((options.zoom?.panX || 0) * 100).toFixed(0)}%</span>
+            </div>
+            <div className="flex items-center gap-2">
+              <span className="text-[10px] text-editor-text-muted w-16">Pan Y:</span>
+              <input
+                type="range"
+                min={-1}
+                max={1}
+                step={0.05}
+                value={options.zoom?.panY || 0}
+                onChange={(e) => setOptions((o) => ({ ...o, zoom: { ...o.zoom!, panY: Number(e.target.value) } }))}
+                className="flex-1 h-1.5"
+              />
+              <span className="text-xs text-editor-text w-10 text-right">{((options.zoom?.panY || 0) * 100).toFixed(0)}%</span>
+            </div>
+          </div>
+        )}
+      </div>
+
+      {/* Background removal */}
+      {!isAudioOnly && (
+        <div className="space-y-2 pt-1 border-t border-editor-border">
+          <label className="flex items-center gap-2 cursor-pointer">
+            <input
+              type="checkbox"
+              checked={options.removeBackground || false}
+              onChange={(e) => setOptions((o) => ({ ...o, removeBackground: e.target.checked }))}
+              className="w-4 h-4 rounded bg-editor-surface border-editor-border accent-editor-accent"
+            />
+            <div>
+              <span className="text-xs font-medium flex items-center gap-1">
+                <Video className="w-3 h-3" />
+                Remove background
+              </span>
+              <p className="text-[10px] text-editor-text-muted">
+                Replace or blur the background. Uses MediaPipe if available.
+              </p>
+            </div>
+          </label>
+          {options.removeBackground && (
+            <div className="pl-6 space-y-2">
+              <SelectField
+                label="Background replacement"
+                value={options.backgroundReplacement || 'blur'}
+                onChange={(v) => setOptions((o) => ({ ...o, backgroundReplacement: v as 'blur' | 'color' | 'image' }))}
+                options={[
+                  { value: 'blur', label: 'Blur background' },
+                  { value: 'color', label: 'Solid color' },
+                  { value: 'image', label: 'Custom image' },
+                ]}
+              />
+              {options.backgroundReplacement === 'color' && (
+                <input
+                  type="text"
+                  value={options.backgroundReplacementValue || '#00FF00'}
+                  onChange={(e) => setOptions((o) => ({ ...o, backgroundReplacementValue: e.target.value }))}
+                  placeholder="#00FF00"
+                  className="w-full px-2 py-1.5 text-xs bg-editor-surface border border-editor-border rounded focus:outline-none focus:border-editor-accent [color-scheme:dark]"
+                />
+              )}
+              {options.backgroundReplacement === 'image' && (
+                <p className="text-[10px] text-editor-text-muted">Place a background image file path above.</p>
+              )}
+            </div>
+          )}
+        </div>
+      )}
+
+      {/* Background music track info */}
+      {backgroundMusic && (
+        <div className="pt-1 border-t border-editor-border">
+          <div className="flex items-center gap-1.5 text-xs text-editor-accent">
+            <Music className="w-3 h-3" />
+            Background music: {backgroundMusic.path.split(/[/\\]/).pop()}
+          </div>
+        </div>
+      )}
+
+      {/* Append clips info */}
+      {additionalClips.length > 0 && (
+        <div className="pt-1 border-t border-editor-border">
+          <div className="flex items-center gap-1.5 text-xs text-editor-accent">
+            <Video className="w-3 h-3" />
+            {additionalClips.length} additional clip{additionalClips.length > 1 ? 's' : ''} appended
+          </div>
+        </div>
+      )}
+
       {/* Audio normalization — integrated into export */}
       <div className="space-y-2 pt-1 border-t border-editor-border">
         <label className="flex items-center gap-2 cursor-pointer">

frontend/src/components/MarkersPanel.tsx

@@ -0,0 +1,151 @@
+import { useState } from 'react';
+import { useEditorStore } from '../store/editorStore';
+import { MapPin, Trash2, PencilLine, Check, X, Copy } from 'lucide-react';
+
+const COLORS = ['#6366f1', '#ef4444', '#22c55e', '#f59e0b', '#3b82f6', '#ec4899', '#8b5cf6', '#14b8a6'];
+
+export default function MarkersPanel() {
+  const { timelineMarkers, addTimelineMarker, updateTimelineMarker, removeTimelineMarker, getChapters } =
+    useEditorStore();
+  const currentTime = useEditorStore((s) => s.currentTime);
+  const [editingId, setEditingId] = useState<string | null>(null);
+  const [editLabel, setEditLabel] = useState('');
+  const [newLabel, setNewLabel] = useState('');
+  const [newColor, setNewColor] = useState(COLORS[0]);
+  const [showChapters, setShowChapters] = useState(false);
+
+  const chapters = getChapters();
+
+  const addAtCurrentTime = () => {
+    addTimelineMarker(currentTime, newLabel || undefined, newColor);
+    setNewLabel('');
+  };
+
+  const startEdit = (id: string, label: string) => {
+    setEditingId(id);
+    setEditLabel(label);
+  };
+
+  const commitEdit = (id: string) => {
+    if (editLabel.trim()) {
+      updateTimelineMarker(id, { label: editLabel.trim() });
+    }
+    setEditingId(null);
+  };
+
+  const exportChapters = () => {
+    const lines = chapters.map((ch) => {
+      const h = Math.floor(ch.startTime / 3600);
+      const m = Math.floor((ch.startTime % 3600) / 60);
+      const s = Math.floor(ch.startTime % 60);
+      const timeStr = `${h > 0 ? `${h}:` : ''}${String(m).padStart(2, '0')}:${String(s).padStart(2, '0')}`;
+      return `${timeStr} ${ch.label}`;
+    });
+    const text = lines.join('\n');
+    navigator.clipboard.writeText(text).catch(() => {});
+  };
+
+  return (
+    <div className="p-4 space-y-4">
+      <div className="space-y-1">
+        <h3 className="text-sm font-semibold flex items-center gap-1.5">
+          <MapPin className="w-4 h-4" />
+          Timeline Markers
+        </h3>
+        <p className="text-xs text-editor-text-muted">
+          Drop markers at key points. Markers become YouTube-compatible chapters.
+        </p>
+      </div>
+
+      {/* Add marker at current time */}
+      <div className="space-y-2">
+        <div className="flex items-center gap-2">
+          <input
+            value={newLabel}
+            onChange={(e) => setNewLabel(e.target.value)}
+            placeholder={`${currentTime.toFixed(2)}s`}
+            className="flex-1 px-2 py-1.5 text-xs bg-editor-surface border border-editor-border rounded focus:outline-none focus:border-editor-accent"
+          />
+          <div className="flex gap-0.5">
+            {COLORS.map((c) => (
+              <button
+                key={c}
+                onClick={() => setNewColor(c)}
+                className={`w-4 h-4 rounded-full border ${newColor === c ? 'border-white ring-1 ring-white' : 'border-transparent'}`}
+                style={{ backgroundColor: c }}
+              />
+            ))}
+          </div>
+        </div>
+        <button
+          onClick={addAtCurrentTime}
+          className="w-full flex items-center justify-center gap-1 px-2 py-1.5 text-xs bg-editor-accent/20 text-editor-accent hover:bg-editor-accent/30 rounded"
+        >
+          <MapPin className="w-3 h-3" />
+          Add
+        </button>
+      </div>
+
+      {/* Marker list */}
+      {timelineMarkers.length > 0 && (
+        <div className="space-y-1 max-h-60 overflow-y-auto">
+          {timelineMarkers.map((m) => (
+            <div
+              key={m.id}
+              className="flex items-center gap-2 px-2 py-1.5 rounded bg-editor-surface border border-editor-border text-xs"
+            >
+              <div className="w-2.5 h-2.5 rounded-full shrink-0" style={{ backgroundColor: m.color }} />
+              <span className="text-[10px] text-editor-text-muted w-14 shrink-0">{m.time.toFixed(2)}s</span>
+              {editingId === m.id ? (
+                <>
+                  <input
+                    value={editLabel}
+                    onChange={(e) => setEditLabel(e.target.value)}
+                    autoFocus
+                    className="flex-1 px-1.5 py-0.5 text-xs bg-editor-bg border border-editor-border rounded focus:outline-none focus:border-editor-accent"
+                  />
+                  <button onClick={() => commitEdit(m.id)} className="p-0.5 text-editor-success"><Check className="w-3 h-3" /></button>
+                  <button onClick={() => setEditingId(null)} className="p-0.5 text-editor-text-muted"><X className="w-3 h-3" /></button>
+                </>
+              ) : (
+                <>
+                  <span className="flex-1 truncate">{m.label}</span>
+                  <button onClick={() => startEdit(m.id, m.label)} className="p-0.5 hover:text-editor-accent"><PencilLine className="w-3 h-3" /></button>
+                  <button onClick={() => removeTimelineMarker(m.id)} className="p-0.5 hover:text-editor-danger"><Trash2 className="w-3 h-3" /></button>
+                </>
+              )}
+            </div>
+          ))}
+        </div>
+      )}
+
+      {/* Chapters */}
+      {chapters.length > 0 && (
+        <div className="space-y-2 pt-1 border-t border-editor-border">
+          <button
+            onClick={() => setShowChapters(!showChapters)}
+            className="flex items-center gap-1 text-xs font-medium text-editor-text-muted hover:text-editor-text"
+          >
+            {showChapters ? '▼' : '▶'} Chapters ({chapters.length})
+          </button>
+          {showChapters && (
+            <div className="space-y-1">
+              {chapters.map((ch) => (
+                <div key={ch.markerId} className="flex items-center gap-2 text-[10px] text-editor-text-muted">
+                  <span className="font-mono">{ch.label}</span>
+                </div>
+              ))}
+              <button
+                onClick={exportChapters}
+                className="flex items-center gap-1 text-[10px] text-editor-accent hover:underline"
+              >
+                <Copy className="w-2.5 h-2.5" />
+                Copy as YouTube timestamps
+              </button>
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  );
+}

frontend/src/components/SettingsPanel.tsx

@@ -1,8 +1,9 @@
 import { useAIStore } from '../store/aiStore';
 import { useState, useEffect, useCallback } from 'react';
-import type { AIProvider } from '../types/project';
+import type { AIProvider, KeyBinding, HotkeyPreset } from '../types/project';
 import { useEditorStore } from '../store/editorStore';
-import { Bot, Cloud, Brain, RefreshCw } from 'lucide-react';
+import { Bot, Cloud, Brain, RefreshCw, Keyboard } from 'lucide-react';
+import { loadBindings, saveBindings, applyPreset as applyKeyPreset, DEFAULT_PRESETS, detectConflicts as detectKeyConflicts } from '../lib/keybindings';
 
 export default function SettingsPanel() {
   const { providers, defaultProvider, setProviderConfig, setDefaultProvider } = useAIStore();
@@ -19,6 +20,51 @@ export default function SettingsPanel() {
       window.localStorage.setItem(CONFIDENCE_THRESHOLD_KEY, String(clamped));
     }
   };
+  // Keyboard shortcuts state
+  const [bindings, setBindings] = useState<KeyBinding[]>(() => {
+    try { return loadBindings(); } catch { return DEFAULT_PRESETS['standard']; }
+  });
+  const [editingKey, setEditingKey] = useState<string | null>(null);
+  const [editKeyValue, setEditKeyValue] = useState('');
+  const conflicts = detectKeyConflicts(bindings);
+
+  const persistBindings = (newB: KeyBinding[]) => {
+    saveBindings(newB);
+    setBindings(newB);
+  };
+
+  const applyPresetAction = (preset: HotkeyPreset) => {
+    persistBindings(applyKeyPreset(preset));
+  };
+
+  const startKeyEdit = (idx: number) => {
+    setEditingKey(bindings[idx].id);
+    setEditKeyValue(bindings[idx].keys);
+  };
+
+  const handleKeyCapture = (e: React.KeyboardEvent, idx: number) => {
+    e.preventDefault();
+    const parts: string[] = [];
+    if (e.ctrlKey || e.metaKey) parts.push('Ctrl');
+    if (e.shiftKey) parts.push('Shift');
+    if (e.altKey) parts.push('Alt');
+    const key = e.key === ' ' ? 'Space' : e.key.length === 1 ? e.key.toUpperCase() : e.key;
+    if (!['Control', 'Shift', 'Alt', 'Meta'].includes(key)) parts.push(key);
+    if (parts.length === 0) return;
+    const combo = parts.join('+');
+    const newBindings = bindings.map((b, i) => (i === idx ? { ...b, keys: combo } : b));
+    setEditKeyValue(combo);
+    setEditingKey(null);
+    persistBindings(newBindings);
+  };
+
+  const handleReset = (idx: number) => {
+    const standard = DEFAULT_PRESETS['standard'];
+    const existing = standard.find((b: KeyBinding) => b.id === bindings[idx].id);
+    if (!existing) return;
+    persistBindings(bindings.map((b, i) => (i === idx ? { ...existing } : b)));
+  };
+
   const [ollamaModels, setOllamaModels] = useState<string[]>([]);
   const [loadingModels, setLoadingModels] = useState(false);
 
@@ -112,6 +158,60 @@ export default function SettingsPanel() {
         </div>
       </div>
 
+      {/* Keyboard shortcuts */}
+      <div className="space-y-2 pt-1 border-t border-editor-border">
+        <h4 className="text-xs font-semibold flex items-center gap-1.5">
+          <Keyboard className="w-3.5 h-3.5" />
+          Keyboard Shortcuts
+        </h4>
+        <div className="flex items-center gap-2">
+          <button
+            onClick={() => applyPresetAction('standard')}
+            className="flex-1 px-2 py-1.5 text-xs rounded bg-editor-accent/20 text-editor-accent hover:bg-editor-accent/30"
+          >
+            Standard Preset
+          </button>
+          <button
+            onClick={() => applyPresetAction('left-hand')}
+            className="flex-1 px-2 py-1.5 text-xs rounded bg-editor-accent/20 text-editor-accent hover:bg-editor-accent/30"
+          >
+            Left-Hand Preset
+          </button>
+        </div>
+        {conflicts.length > 0 && (
+          <div className="px-2 py-1 rounded border border-red-500/40 bg-red-500/10 text-[10px] text-red-300">
+            ⚠️ {conflicts.join('; ')}
+          </div>
+        )}
+        <div className="max-h-52 overflow-y-auto space-y-1 pr-1">
+          {bindings.map((b, i) => (
+            <div key={b.id} className="flex items-center gap-2 text-[11px]">
+              <span className="flex-1 truncate text-editor-text-muted">{b.label}</span>
+              <input
+                value={editingKey === b.id ? editKeyValue : b.keys}
+                onFocus={() => startKeyEdit(i)}
+                onChange={(e) => {
+                  setEditingKey(b.id);
+                  setEditKeyValue(e.target.value);
+                }}
+                onKeyDown={(e) => handleKeyCapture(e, i)}
+                className="w-28 px-2 py-1 text-[10px] font-mono bg-editor-bg border border-editor-border rounded text-center focus:outline-none focus:border-editor-accent"
+                placeholder="Type shortcut"
+              />
+              <button
+                onClick={() => handleReset(i)}
+                className="text-[10px] text-editor-text-muted hover:text-editor-text px-1"
+              >
+                ↺
+              </button>
+            </div>
+          ))}
+        </div>
+        <p className="text-[10px] text-editor-text-muted">
+          Press <kbd>?</kbd> anytime to view shortcuts. Changes apply immediately.
+        </p>
+      </div>
+
       {/* Default provider selector */}
       <div className="space-y-2">
         <label className="text-xs text-editor-text-muted font-medium">Default AI Provider</label>

frontend/src/components/WaveformTimeline.tsx

@@ -1,6 +1,7 @@
 import { useRef, useEffect, useCallback, useState, useMemo } from 'react';
 import { useEditorStore } from '../store/editorStore';
 import { AlertTriangle } from 'lucide-react';
+import { extractThumbnails } from '../lib/thumbnails';
 
 const RULER_H = 20; // px reserved at top of canvas for the time ruler
 const COLLAPSED_CUT_DISPLAY_SECONDS = 0.08;
@@ -239,13 +240,18 @@ export default function WaveformTimeline({
   const videoPath = useEditorStore((s) => s.videoPath);
   const backendUrl = useEditorStore((s) => s.backendUrl);
   const duration = useEditorStore((s) => s.duration);
+  const setCurrentTime = useEditorStore((s) => s.setCurrentTime);
   const cutRanges = useEditorStore((s) => s.cutRanges);
   const muteRanges = useEditorStore((s) => s.muteRanges);
   const gainRanges = useEditorStore((s) => s.gainRanges);
   const speedRanges = useEditorStore((s) => s.speedRanges);
+  const timelineMarkers = useEditorStore((s) => s.timelineMarkers);
   const markInTime = useEditorStore((s) => s.markInTime);
   const markOutTime = useEditorStore((s) => s.markOutTime);
-  const setCurrentTime = useEditorStore((s) => s.setCurrentTime);
+  const [showThumbnails, setShowThumbnails] = useState(() => typeof window !== 'undefined' && localStorage.getItem('talkedit:showThumbnails') === 'true');
+  const [thumbnailFrames, setThumbnailFrames] = useState<Map<number, string>>(new Map());
+  void setShowThumbnails;
+  const thumbnailContainerRef = useRef<HTMLDivElement>(null);
   const addCutRange = useEditorStore((s) => s.addCutRange);
   const addMuteRange = useEditorStore((s) => s.addMuteRange);
   const addGainRange = useEditorStore((s) => s.addGainRange);
@@ -606,6 +612,46 @@ export default function WaveformTimeline({
     if (markInTime !== null) drawMarkLine(markInTime, 'I');
     if (markOutTime !== null) drawMarkLine(markOutTime, 'O');
 
+    // Draw timeline markers (numbered circles)
+    const sortedMarkers = [...timelineMarkers].sort((a, b) => a.time - b.time);
+    for (let mi = 0; mi < sortedMarkers.length; mi++) {
+      const marker = sortedMarkers[mi];
+      const number = mi + 1;
+      const x = (sourceToDisplayTime(marker.time, timelineSegments, dur) - scroll) * pxPerSec;
+      if (x < -8 || x > width + 8) continue;
+      const radius = 7;
+      const cy = waveTop - radius - 2;
+      // Draw filled circle
+      ctx.beginPath();
+      ctx.arc(x, cy, radius, 0, Math.PI * 2);
+      ctx.fillStyle = marker.color;
+      ctx.fill();
+      ctx.strokeStyle = '#0f1117';
+      ctx.lineWidth = 1.5;
+      ctx.stroke();
+      // Draw number
+      ctx.fillStyle = '#ffffff';
+      ctx.font = 'bold 9px sans-serif';
+      ctx.textAlign = 'center';
+      ctx.textBaseline = 'middle';
+      ctx.fillText(String(number), x, cy);
+      ctx.textAlign = 'start';
+      ctx.textBaseline = 'alphabetic';
+      // Draw a thin vertical line below the circle
+      ctx.beginPath();
+      ctx.moveTo(x, cy + radius);
+      ctx.lineTo(x, waveTop + waveH);
+      ctx.strokeStyle = marker.color;
+      ctx.lineWidth = 1;
+      ctx.stroke();
+      // Label to the right
+      ctx.fillStyle = marker.color;
+      ctx.font = '9px sans-serif';
+      ctx.textBaseline = 'bottom';
+      ctx.fillText(marker.label, Math.min(width - 50, Math.max(2, x + 5)), waveTop - 2);
+      ctx.textBaseline = 'alphabetic';
+    }
+
     const mid = waveTop + waveH / 2;
     ctx.beginPath();
     ctx.strokeStyle = '#4a4d5e';
@@ -1169,6 +1215,26 @@ export default function WaveformTimeline({
     if (selectedZone.type === 'speed' && !showSpeedZones) setSelectedZone(null);
   }, [selectedZone, showCutZones, showMuteZones, showGainZones, showSpeedZones]);
 
+  // Capture thumbnail frames when enabled
+  useEffect(() => {
+    if (!showThumbnails) { setThumbnailFrames(new Map()); return; }
+    const dur = displayDuration || waveformDataRef.current?.duration || 0;
+    if (dur <= 0) return;
+    const video = document.querySelector('video') as HTMLVideoElement | null;
+    if (!video) return;
+
+    const interval = 10;
+    const times: number[] = [];
+    for (let t = 0; t < dur; t += interval) times.push(t);
+
+    let cancelled = false;
+    extractThumbnails(video, times).then((frames) => {
+      if (!cancelled) setThumbnailFrames(frames);
+    });
+
+    return () => { cancelled = true; };
+  }, [showThumbnails, videoUrl, displayDuration]);
+
   if (!videoUrl) {
     return (
       <div className="w-full h-full flex items-center justify-center text-editor-text-muted text-xs">
@@ -1248,6 +1314,35 @@ export default function WaveformTimeline({
           </pre>
         </div>
       ) : (
+        <div className="flex-1 relative flex flex-col">
+          {showThumbnails && thumbnailFrames.size > 0 && (
+            <div
+              ref={thumbnailContainerRef}
+              className="h-14 shrink-0 overflow-x-auto border-b border-editor-border/60"
+              style={{ scrollbarWidth: 'thin' }}
+            >
+              <div className="relative h-full" style={{ width: '100%', minHeight: 0 }}>
+                {Array.from(thumbnailFrames.entries()).map(([time, dataUrl]) => {
+                  const dur = displayDuration || waveformDataRef.current?.duration || 1;
+                  const pct = (time / dur) * 100;
+                  return (
+                    <img
+                      key={time}
+                      src={dataUrl}
+                      alt={`Thumbnail at ${time.toFixed(0)}s`}
+                      className="absolute top-1 rounded border border-editor-border/40 object-cover cursor-pointer"
+                      style={{ left: `${pct}%`, width: 80, height: 45, transform: 'translateX(-50%)' }}
+                      title={`${time.toFixed(0)}s`}
+                      onClick={() => {
+                        const video = document.querySelector('video') as HTMLVideoElement | null;
+                        if (video) { video.currentTime = time; setCurrentTime(time); }
+                      }}
+                    />
+                  );
+                })}
+              </div>
+            </div>
+          )}
           <div className="flex-1 relative">
             <canvas ref={waveCanvasRef} className="absolute inset-0 w-full h-full" />
             <canvas
@@ -1259,6 +1354,7 @@ export default function WaveformTimeline({
               onWheel={handleWheel}
             />
           </div>
+        </div>
       )}
     </div>
   );

frontend/src/hooks/useKeyboardShortcuts.ts

@@ -1,5 +1,7 @@
 import { useEffect, useRef } from 'react';
 import { useEditorStore } from '../store/editorStore';
+import { loadBindings } from '../lib/keybindings';
+import type { KeyBinding } from '../types/project';
 
 export function useKeyboardShortcuts() {
   const addCutRange = useEditorStore((s) => s.addCutRange);
@@ -10,9 +12,13 @@ export function useKeyboardShortcuts() {
   const clearMarkRange = useEditorStore((s) => s.clearMarkRange);
   const selectedWordIndices = useEditorStore((s) => s.selectedWordIndices);
   const words = useEditorStore((s) => s.words);
-
   const playbackRateRef = useRef(1);
 
+  // Read bindings fresh from localStorage on every call to avoid stale closures
+  const getBindings = (): KeyBinding[] => {
+    try { return loadBindings(); } catch { return []; }
+  };
+
   useEffect(() => {
     const getVideo = (): HTMLVideoElement | null => document.querySelector('video');
 
@@ -22,81 +28,58 @@ export function useKeyboardShortcuts() {
 
       const video = getVideo();
 
-      switch (true) {
-        // --- Undo / Redo ---
-        case e.key === 'z' && (e.ctrlKey || e.metaKey) && e.shiftKey: {
-          e.preventDefault();
-          useEditorStore.temporal.getState().redo();
-          return;
-        }
-        case e.key === 'z' && (e.ctrlKey || e.metaKey): {
+      // Build a key string from the event for matching
+      const parts: string[] = [];
+      if (e.ctrlKey || e.metaKey) parts.push('Ctrl');
+      if (e.shiftKey && !['Shift'].includes(e.key)) parts.push('Shift');
+      if (e.altKey) parts.push('Alt');
+      const keyStr = e.key === ' ' ? 'Space' : e.key.length === 1 ? e.key.toUpperCase() : e.key;
+      parts.push(keyStr);
+      const combo = parts.join('+');
+
+      // Look up binding — fresh read every keystroke so Settings changes take effect immediately
+      const currentBindings = getBindings();
+      const binding = currentBindings.find((b) => b.keys === combo);
+      if (!binding) return;  // Unbound key — ignore
+
       e.preventDefault();
+
+      switch (binding.id) {
+        case 'undo':
           useEditorStore.temporal.getState().undo();
           return;
-        }
-
-        // --- Delete / Backspace: cut selected words ---
-        case e.key === 'Delete' || e.key === 'Backspace': {
+        case 'redo':
+          useEditorStore.temporal.getState().redo();
+          return;
+        case 'cut': {
           if (selectedWordIndices.length > 0) {
-            e.preventDefault();
             const sorted = [...selectedWordIndices].sort((a, b) => a - b);
-            const startTime = words[sorted[0]].start;
-            const endTime = words[sorted[sorted.length - 1]].end;
-            addCutRange(startTime, endTime);
+            addCutRange(words[sorted[0]].start, words[sorted[sorted.length - 1]].end);
             return;
           }
-
           if (markInTime !== null && markOutTime !== null) {
-            e.preventDefault();
             const start = Math.min(markInTime, markOutTime);
             const end = Math.max(markInTime, markOutTime);
-            if (end - start >= 0.01) {
-              addCutRange(start, end);
-            }
+            if (end - start >= 0.01) addCutRange(start, end);
             clearMarkRange();
           }
           return;
         }
-
-        // --- Space: play / pause ---
-        case e.key === ' ' && !e.ctrlKey: {
-          e.preventDefault();
-          if (video) {
-            if (video.paused) video.play();
-            else video.pause();
-          }
+        case 'play-pause':
+          if (video) { if (video.paused) video.play(); else video.pause(); }
           return;
-        }
-
-        // --- J: reverse / slow down ---
-        case e.key === 'j' || e.key === 'J': {
-          e.preventDefault();
+        case 'slow-down': {
           if (video) {
             playbackRateRef.current = Math.max(-2, playbackRateRef.current - 0.5);
-            if (playbackRateRef.current < 0) {
-              // HTML5 video doesn't support negative rates natively; step back
-              video.currentTime = Math.max(0, video.currentTime - 2);
-            } else {
-              video.playbackRate = playbackRateRef.current;
-              if (video.paused) video.play();
-            }
+            if (playbackRateRef.current < 0) video.currentTime = Math.max(0, video.currentTime - 2);
+            else { video.playbackRate = playbackRateRef.current; if (video.paused) video.play(); }
           }
           return;
         }
-
-        // --- K: pause ---
-        case e.key === 'k' || e.key === 'K': {
-          e.preventDefault();
-          if (video) {
-            video.pause();
-            playbackRateRef.current = 1;
-          }
+        case 'pause':
+          if (video) { video.pause(); playbackRateRef.current = 1; }
           return;
-        }
-
-        // --- L: forward / speed up ---
-        case e.key === 'l' || e.key === 'L': {
-          e.preventDefault();
+        case 'speed-up': {
           if (video) {
             playbackRateRef.current = Math.min(4, playbackRateRef.current + 0.5);
             video.playbackRate = Math.max(0.25, playbackRateRef.current);
@@ -104,60 +87,37 @@ export function useKeyboardShortcuts() {
           }
           return;
         }
-
-        // --- Arrow Left: seek back 5s ---
-        case e.key === 'ArrowLeft' && !e.ctrlKey: {
-          e.preventDefault();
+        case 'rewind':
           if (video) video.currentTime = Math.max(0, video.currentTime - 5);
           return;
-        }
-
-        // --- Arrow Right: seek forward 5s ---
-        case e.key === 'ArrowRight' && !e.ctrlKey: {
-          e.preventDefault();
+        case 'forward':
           if (video) video.currentTime = Math.min(video.duration, video.currentTime + 5);
           return;
-        }
-
-        // --- I: mark in-point ---
-        case e.key === 'i' || e.key === 'I': {
-          e.preventDefault();
+        case 'mark-in':
           if (video) setMarkInTime(video.currentTime);
           return;
-        }
-
-        // --- O: mark out-point ---
-        case e.key === 'o' || e.key === 'O': {
-          e.preventDefault();
+        case 'mark-out':
           if (video) setMarkOutTime(video.currentTime);
           return;
-        }
-
-        // --- Ctrl+S: save project ---
-        case e.key === 's' && (e.ctrlKey || e.metaKey): {
-          e.preventDefault();
+        case 'save': {
           const saveBtn = document.querySelector('[title="Save"]') as HTMLButtonElement | null;
           if (saveBtn) saveBtn.click();
           else saveProject();
           return;
         }
-
-        // --- Ctrl+E: export ---
-        case e.key === 'e' && (e.ctrlKey || e.metaKey): {
-          e.preventDefault();
-          // Trigger export panel via DOM click
+        case 'export': {
           const exportBtn = document.querySelector('[title="Export"]') as HTMLButtonElement;
           if (exportBtn) exportBtn.click();
           return;
         }
-
-        // --- ?: show shortcut cheatsheet ---
-        case e.key === '?' || (e.key === '/' && e.shiftKey): {
-          e.preventDefault();
-          toggleCheatsheet();
+        case 'search': {
+          const findBtn = document.querySelector('[title="Find (Ctrl+F)"]') as HTMLButtonElement;
+          if (findBtn) findBtn.click();
           return;
         }
-
+        case 'help':
+          toggleCheatsheet(currentBindings);
+          return;
         default:
           break;
       }
@@ -205,7 +165,7 @@ async function saveProject() {
   }
 }
 
-function toggleCheatsheet() {
+function toggleCheatsheet(bindings: KeyBinding[]) {
   const existing = document.getElementById('keyboard-cheatsheet');
   if (existing) {
     existing.remove();
@@ -220,32 +180,17 @@ function toggleCheatsheet() {
     overlay.remove();
   };
 
-  const shortcuts = [
-    ['Space', 'Play / Pause'],
-    ['J', 'Reverse / Slow down'],
-    ['K', 'Pause'],
-    ['L', 'Forward / Speed up'],
-    ['\u2190 / \u2192', 'Seek \u00b15 seconds'],
-    ['I / O', 'Mark in / out points'],
-    ['Delete', 'Cut selected words'],
-    ['Ctrl+Z', 'Undo'],
-    ['Ctrl+Shift+Z', 'Redo'],
-    ['Ctrl+S', 'Save project'],
-    ['Ctrl+E', 'Export'],
-    ['?', 'This cheatsheet'],
-  ];
-
-  const rows = shortcuts
+  const rows = bindings
     .map(
-      ([key, desc]) =>
-        `<tr><td style="padding:6px 16px 6px 0;font-family:monospace;color:#818cf8;font-weight:600">${key}</td><td style="padding:6px 0;color:#e2e8f0">${desc}</td></tr>`,
+      (b) =>
+        `<tr><td style="padding:6px 16px 6px 0;font-family:monospace;color:#818cf8;font-weight:600;white-space:nowrap">${b.keys}</td><td style="padding:6px 0;color:#e2e8f0">${b.label}</td><td style="padding:6px 0 6px 12px;font-size:10px;color:#94a3b8">${b.category}</td></tr>`,
     )
     .join('');
 
-  overlay.innerHTML = `<div style="background:#1a1d27;border:1px solid #2a2d3a;border-radius:12px;padding:24px 32px;max-width:400px;" onclick="event.stopPropagation()">
+  overlay.innerHTML = `<div style="background:#1a1d27;border:1px solid #2a2d3a;border-radius:12px;padding:24px 32px;max-width:450px;" onclick="event.stopPropagation()">
     <h3 style="margin:0 0 16px;font-size:14px;font-weight:600;color:#e2e8f0">Keyboard Shortcuts</h3>
     <table style="font-size:13px">${rows}</table>
-    <p style="margin:16px 0 0;font-size:11px;color:#94a3b8;text-align:center">Press ? or click outside to close</p>
+    <p style="margin:16px 0 0;font-size:11px;color:#94a3b8;text-align:center">Customize in Settings &bull; Press ? to close</p>
   </div>`;
 
   document.body.appendChild(overlay);

frontend/src/lib/keybindings.ts

@@ -0,0 +1,83 @@
+/**
+ * Configurable keyboard shortcuts system.
+ * Stores bindings in localStorage under 'talkedit:keybindings'.
+ * Provides default presets and conflict detection.
+ */
+import type { KeyBinding, HotkeyPreset } from '../types/project';
+
+const STORAGE_KEY = 'talkedit:keybindings';
+
+export const DEFAULT_PRESETS: Record<HotkeyPreset, KeyBinding[]> = {
+  'left-hand': [
+    { id: 'play-pause',   label: 'Play / Pause',      keys: 'Space',    category: 'transport' },
+    { id: 'rewind',       label: 'Rewind 5s',          keys: 'Q',        category: 'transport' },
+    { id: 'forward',      label: 'Forward 5s',         keys: 'E',        category: 'transport' },
+    { id: 'speed-up',     label: 'Speed Up',           keys: 'W',        category: 'transport' },
+    { id: 'slow-down',    label: 'Slow Down',          keys: 'S',        category: 'transport' },
+    { id: 'pause',        label: 'Pause',               keys: 'D',        category: 'transport' },
+    { id: 'mark-in',      label: 'Mark In Point',       keys: 'A',        category: 'edit' },
+    { id: 'mark-out',     label: 'Mark Out Point',      keys: 'F',        category: 'edit' },
+    { id: 'cut',          label: 'Cut Selection',       keys: 'X',        category: 'edit' },
+    { id: 'undo',         label: 'Undo',                keys: 'Ctrl+Z',   category: 'edit' },
+    { id: 'redo',         label: 'Redo',                keys: 'Ctrl+Shift+Z', category: 'edit' },
+    { id: 'save',         label: 'Save',                keys: 'Ctrl+S',   category: 'file' },
+    { id: 'export',       label: 'Export',              keys: 'Ctrl+E',   category: 'file' },
+    { id: 'search',       label: 'Find in Transcript',  keys: 'Ctrl+F',   category: 'edit' },
+    { id: 'help',         label: 'Shortcut Help',       keys: '?',        category: 'view' },
+  ],
+  'standard': [
+    { id: 'play-pause',   label: 'Play / Pause',      keys: 'Space',    category: 'transport' },
+    { id: 'rewind',       label: 'Rewind 5s',          keys: 'ArrowLeft',  category: 'transport' },
+    { id: 'forward',      label: 'Forward 5s',         keys: 'ArrowRight', category: 'transport' },
+    { id: 'speed-up',     label: 'Speed Up',           keys: 'L',        category: 'transport' },
+    { id: 'slow-down',    label: 'Slow Down',          keys: 'J',        category: 'transport' },
+    { id: 'pause',        label: 'Pause',               keys: 'K',        category: 'transport' },
+    { id: 'mark-in',      label: 'Mark In Point',       keys: 'I',        category: 'edit' },
+    { id: 'mark-out',     label: 'Mark Out Point',      keys: 'O',        category: 'edit' },
+    { id: 'cut',          label: 'Cut Selection',       keys: 'Delete',   category: 'edit' },
+    { id: 'undo',         label: 'Undo',                keys: 'Ctrl+Z',   category: 'edit' },
+    { id: 'redo',         label: 'Redo',                keys: 'Ctrl+Shift+Z', category: 'edit' },
+    { id: 'save',         label: 'Save',                keys: 'Ctrl+S',   category: 'file' },
+    { id: 'export',       label: 'Export',              keys: 'Ctrl+E',   category: 'file' },
+    { id: 'search',       label: 'Find in Transcript',  keys: 'Ctrl+F',   category: 'edit' },
+    { id: 'help',         label: 'Shortcut Help',       keys: '?',        category: 'view' },
+  ],
+};
+
+export function loadBindings(): KeyBinding[] {
+  try {
+    const stored = localStorage.getItem(STORAGE_KEY);
+    if (stored) return JSON.parse(stored);
+  } catch { /* use defaults */ }
+  return DEFAULT_PRESETS['standard'];
+}
+
+export function saveBindings(bindings: KeyBinding[]) {
+  localStorage.setItem(STORAGE_KEY, JSON.stringify(bindings));
+}
+
+export function applyPreset(preset: HotkeyPreset): KeyBinding[] {
+  const bindings = DEFAULT_PRESETS[preset];
+  saveBindings(bindings);
+  return bindings;
+}
+
+export function detectConflicts(bindings: KeyBinding[]): string[] {
+  const conflicts: string[] = [];
+  const seen = new Map<string, string>();
+  for (const b of bindings) {
+    if (seen.has(b.keys)) {
+      conflicts.push(`"${b.keys}" is used by both "${seen.get(b.keys)}" and "${b.label}"`);
+    }
+    seen.set(b.keys, b.label);
+  }
+  return conflicts;
+}
+
+export function findBinding(bindings: KeyBinding[], id: string): KeyBinding | undefined {
+  return bindings.find((b) => b.id === id);
+}
+
+export function getBoundKey(bindings: KeyBinding[], id: string): string {
+  return findBinding(bindings, id)?.keys || '';
+}

frontend/src/lib/thumbnails.ts

@@ -0,0 +1,81 @@
+/**
+ * Frontend-side video thumbnail extraction.
+ * Captures frames from the <video> element using canvas.
+ */
+
+const THUMBNAIL_CACHE = new Map<string, string>();
+
+export function extractThumbnail(video: HTMLVideoElement, time: number, width = 160, height = 90): string | null {
+  const cacheKey = `${video.src}_${time.toFixed(3)}_${width}x${height}`;
+  const cached = THUMBNAIL_CACHE.get(cacheKey);
+  if (cached) return cached;
+
+  // Seek to the time, wait for seeked, then capture
+  // Since this is synchronous, we use the current ready frame
+  const canvas = document.createElement('canvas');
+  canvas.width = width;
+  canvas.height = height;
+  const ctx = canvas.getContext('2d');
+  if (!ctx) return null;
+
+  // Try to draw the current frame at the requested time
+  const originalTime = video.currentTime;
+  video.currentTime = time;
+
+  // We can't synchronously wait for seek, so catch the 'seeked' event externally
+  // For now, draw whatever video frame is available
+  ctx.drawImage(video, 0, 0, width, height);
+
+  // Return to original time (best-effort)
+  video.currentTime = originalTime;
+
+  const dataUrl = canvas.toDataURL('image/jpeg', 0.6);
+  THUMBNAIL_CACHE.set(cacheKey, dataUrl);
+  return dataUrl;
+}
+
+export async function extractThumbnails(
+  video: HTMLVideoElement,
+  times: number[],
+  width = 160,
+  height = 90,
+): Promise<Map<number, string>> {
+  const results = new Map<number, string>();
+  const originalTime = video.currentTime;
+
+  for (const time of times) {
+    const cacheKey = `${video.src}_${time.toFixed(3)}_${width}x${height}`;
+    const cached = THUMBNAIL_CACHE.get(cacheKey);
+    if (cached) {
+      results.set(time, cached);
+      continue;
+    }
+
+    // Seek and wait for the frame to be available
+    video.currentTime = time;
+    await new Promise<void>((resolve) => {
+      const handler = () => {
+        video.removeEventListener('seeked', handler);
+        resolve();
+      };
+      video.addEventListener('seeked', handler);
+      // Fallback: resolve after a short timeout
+      setTimeout(resolve, 500);
+    });
+
+    const canvas = document.createElement('canvas');
+    canvas.width = width;
+    canvas.height = height;
+    const ctx = canvas.getContext('2d');
+    if (ctx) {
+      ctx.drawImage(video, 0, 0, width, height);
+      const dataUrl = canvas.toDataURL('image/jpeg', 0.5);
+      THUMBNAIL_CACHE.set(cacheKey, dataUrl);
+      results.set(time, dataUrl);
+    }
+  }
+
+  // Restore original position
+  video.currentTime = originalTime;
+  return results;
+}

frontend/src/store/editorStore.ts

@@ -12,6 +12,11 @@ import type {
   SilenceDetectionRange,
   SilenceTrimSettings,
   SilenceTrimGroup,
+  TimelineMarker,
+  Chapter,
+  ZoomConfig,
+  ClipInfo,
+  BackgroundMusicConfig,
 } from '../types/project';
 
 interface EditorState {
@@ -27,6 +32,7 @@ interface EditorState {
   speedRanges: SpeedRange[];
   globalGainDb: number;
   silenceTrimGroups: SilenceTrimGroup[];
+  timelineMarkers: TimelineMarker[];
   transcriptionModel: string | null;
   language: string;
 
@@ -47,6 +53,10 @@ interface EditorState {
 
   backendUrl: string;
   zonePreviewPaddingSeconds: number;
+
+  zoomConfig: ZoomConfig;
+  additionalClips: ClipInfo[];
+  backgroundMusic: BackgroundMusicConfig | null;
 }
 
 interface EditorActions {
@@ -89,6 +99,10 @@ interface EditorActions {
     settings: SilenceTrimSettings;
   }) => { groupId: string; appliedCount: number };
   removeSilenceTrimGroup: (groupId: string) => void;
+  addTimelineMarker: (time: number, label?: string, color?: string) => void;
+  updateTimelineMarker: (id: string, updates: Partial<TimelineMarker>) => void;
+  removeTimelineMarker: (id: string) => void;
+  getChapters: () => Chapter[];
   setTranscribing: (active: boolean, progress?: number, status?: string) => void;
   setExporting: (active: boolean, progress?: number) => void;
   setZonePreviewPaddingSeconds: (seconds: number) => void;
@@ -97,6 +111,12 @@ interface EditorActions {
   getWordAtTime: (time: number) => number;
   loadProject: (projectData: any) => void;
   reset: () => void;
+  setZoomConfig: (config: Partial<ZoomConfig>) => void;
+  addAdditionalClip: (path: string, label?: string) => void;
+  removeAdditionalClip: (id: string) => void;
+  reorderAdditionalClip: (id: string, direction: -1 | 1) => void;
+  setBackgroundMusic: (config: BackgroundMusicConfig | null) => void;
+  updateBackgroundMusic: (updates: Partial<BackgroundMusicConfig>) => void;
 }
 
 const ZONE_PREVIEW_PADDING_KEY = 'talkedit-zone-preview-padding-seconds';
@@ -122,6 +142,7 @@ const initialState: EditorState = {
   speedRanges: [],
   globalGainDb: 0,
   silenceTrimGroups: [],
+  timelineMarkers: [],
   transcriptionModel: null,
   language: '',
   currentTime: 0,
@@ -138,6 +159,9 @@ const initialState: EditorState = {
   exportProgress: 0,
   backendUrl: 'http://127.0.0.1:8000',
   zonePreviewPaddingSeconds: getStoredZonePreviewPaddingSeconds(),
+  zoomConfig: { enabled: false, zoomFactor: 1, panX: 0, panY: 0 },
+  additionalClips: [],
+  backgroundMusic: null,
 };
 
 let nextRangeId = 1;
@@ -182,7 +206,7 @@ export const useEditorStore = create<EditorState & EditorActions>()(
       setTranscriptionModel: (model) => set({ transcriptionModel: model }),
 
       saveProject: (): ProjectFile => {
-        const { videoPath, words, segments, cutRanges, muteRanges, gainRanges, speedRanges, globalGainDb, silenceTrimGroups, transcriptionModel, language, exportedAudioPath } = get();
+        const { videoPath, words, segments, cutRanges, muteRanges, gainRanges, speedRanges, globalGainDb, silenceTrimGroups, timelineMarkers, transcriptionModel, language, exportedAudioPath, zoomConfig, additionalClips, backgroundMusic } = get();
         if (!videoPath) throw new Error('No video loaded');
         const now = new Date().toISOString();
         // Strip globalStartIndex (runtime-only field) before persisting.
@@ -204,9 +228,13 @@ export const useEditorStore = create<EditorState & EditorActions>()(
           speedRanges,
           globalGainDb,
           silenceTrimGroups,
+          timelineMarkers,
           language,
-          createdAt: now,  // will be overwritten if we track original creation time later
+          createdAt: now,
           modifiedAt: now,
+          zoomConfig,
+          additionalClips,
+          backgroundMusic: backgroundMusic ?? undefined,
         };
       },
 
@@ -453,6 +481,40 @@ export const useEditorStore = create<EditorState & EditorActions>()(
         });
       },
 
+      addTimelineMarker: (time, label, color) => {
+        const { timelineMarkers } = get();
+        const newMarker: TimelineMarker = {
+          id: `marker_${nextRangeId++}`,
+          time,
+          label: label || `Marker ${timelineMarkers.length + 1}`,
+          color: color || '#6366f1',
+        };
+        set({ timelineMarkers: [...timelineMarkers, newMarker].sort((a, b) => a.time - b.time) });
+      },
+
+      updateTimelineMarker: (id, updates) => {
+        const { timelineMarkers } = get();
+        set({
+          timelineMarkers: timelineMarkers
+            .map((m) => (m.id === id ? { ...m, ...updates } : m))
+            .sort((a, b) => a.time - b.time),
+        });
+      },
+
+      removeTimelineMarker: (id) => {
+        const { timelineMarkers } = get();
+        set({ timelineMarkers: timelineMarkers.filter((m) => m.id !== id) });
+      },
+
+      getChapters: () => {
+        const { timelineMarkers } = get();
+        return timelineMarkers.map((m) => ({
+          markerId: m.id,
+          label: m.label,
+          startTime: m.time,
+        }));
+      },
+
       setTranscribing: (active, progress, status) =>
         set({
           isTranscribing: active,
@@ -557,6 +619,43 @@ export const useEditorStore = create<EditorState & EditorActions>()(
         return lo < words.length ? lo : words.length - 1;
       },
 
+      setZoomConfig: (config) => {
+        const { zoomConfig } = get();
+        set({ zoomConfig: { ...zoomConfig, ...config } });
+      },
+
+      addAdditionalClip: (path, label) => {
+        const { additionalClips } = get();
+        const id = `clip_${Date.now()}_${Math.random().toString(36).slice(2, 6)}`;
+        set({ additionalClips: [...additionalClips, { id, path, label: label || path.split(/[/\\]/).pop() || 'Clip' }] });
+      },
+
+      removeAdditionalClip: (id) => {
+        const { additionalClips } = get();
+        set({ additionalClips: additionalClips.filter((c) => c.id !== id) });
+      },
+
+      reorderAdditionalClip: (id, direction) => {
+        const { additionalClips } = get();
+        const idx = additionalClips.findIndex((c) => c.id === id);
+        if (idx === -1) return;
+        const target = idx + direction;
+        if (target < 0 || target >= additionalClips.length) return;
+        const reordered = [...additionalClips];
+        [reordered[idx], reordered[target]] = [reordered[target], reordered[idx]];
+        set({ additionalClips: reordered });
+      },
+
+      setBackgroundMusic: (config) => {
+        set({ backgroundMusic: config });
+      },
+
+      updateBackgroundMusic: (updates) => {
+        const { backgroundMusic } = get();
+        if (!backgroundMusic) return;
+        set({ backgroundMusic: { ...backgroundMusic, ...updates } });
+      },
+
       loadProject: (data) => {
         const { backendUrl, zonePreviewPaddingSeconds, projectFilePath } = get();
         const url = `${backendUrl}/file?path=${encodeURIComponent(data.videoPath)}`;
@@ -587,9 +686,13 @@ export const useEditorStore = create<EditorState & EditorActions>()(
           speedRanges: data.speedRanges || [],
           globalGainDb: typeof data.globalGainDb === 'number' ? data.globalGainDb : 0,
           silenceTrimGroups: data.silenceTrimGroups || [],
+          timelineMarkers: data.timelineMarkers || [],
           transcriptionModel: data.transcriptionModel ?? null,
           language: data.language || '',
           exportedAudioPath: data.exportedAudioPath ?? null,
+          zoomConfig: data.zoomConfig || { enabled: false, zoomFactor: 1, panX: 0, panY: 0 },
+          additionalClips: data.additionalClips || [],
+          backgroundMusic: data.backgroundMusic || null,
         });
       },
 

frontend/src/types/project.ts

@@ -72,9 +72,13 @@ export interface ProjectFile {
   speedRanges?: SpeedRange[];
   globalGainDb?: number;
   silenceTrimGroups?: SilenceTrimGroup[];
+  timelineMarkers?: TimelineMarker[];
   language: string;
   createdAt: string;
   modifiedAt: string;
+  zoomConfig?: ZoomConfig;
+  additionalClips?: ClipInfo[];
+  backgroundMusic?: BackgroundMusicConfig;
 }
 
 export interface TranscriptionResult {
@@ -83,6 +87,28 @@ export interface TranscriptionResult {
   language: string;
 }
 
+export interface ZoomConfig {
+  enabled: boolean;
+  zoomFactor: number;   // 1.0 = no zoom, 2.0 = 2x zoom
+  panX: number;         // -1 to 1, normalized pan offset
+  panY: number;
+}
+
+export interface ClipInfo {
+  id: string;
+  path: string;
+  label: string;
+}
+
+export interface BackgroundMusicConfig {
+  path: string;
+  volumeDb: number;           // gain in dB for music track
+  duckingEnabled: boolean;
+  duckingDb: number;          // how much to duck (dB reduction)
+  duckingAttackMs: number;
+  duckingReleaseMs: number;
+}
+
 export interface ExportOptions {
   outputPath: string;
   mode: 'fast' | 'reencode';
@@ -91,8 +117,34 @@ export interface ExportOptions {
   enhanceAudio: boolean;
   captions: 'none' | 'burn-in' | 'sidecar';
   captionStyle?: CaptionStyle;
+  zoom?: ZoomConfig;
+  removeBackground?: boolean;
+  backgroundReplacement?: 'blur' | 'color' | 'image';
+  backgroundReplacementValue?: string;
 }
 
+export interface TimelineMarker {
+  id: string;
+  time: number;
+  label: string;
+  color: string;
+}
+
+export interface Chapter {
+  markerId: string;
+  label: string;
+  startTime: number;
+}
+
+export interface KeyBinding {
+  id: string;
+  label: string;
+  keys: string;    // e.g. "Ctrl+Z"
+  category: string; // "transport", "edit", "file", "view"
+}
+
+export type HotkeyPreset = 'left-hand' | 'standard';
+
 export interface CaptionStyle {
   fontName: string;
   fontSize: number;

frontend/tsconfig.tsbuildinfo

@@ -1 +1 @@
-{"root":["./src/App.tsx","./src/main.tsx","./src/vite-env.d.ts","./src/components/AIPanel.tsx","./src/components/DevPanel.tsx","./src/components/ExportDialog.tsx","./src/components/SettingsPanel.tsx","./src/components/SilenceTrimmerPanel.tsx","./src/components/TranscriptEditor.tsx","./src/components/VideoPlayer.tsx","./src/components/VolumePanel.tsx","./src/components/WaveformTimeline.tsx","./src/components/ZoneEditor.tsx","./src/hooks/useKeyboardShortcuts.ts","./src/hooks/useVideoSync.ts","./src/lib/dev-logger.ts","./src/lib/tauri-bridge.ts","./src/store/aiStore.ts","./src/store/editorStore.test.ts","./src/store/editorStore.ts","./src/types/project.ts"],"version":"5.9.3"}
+{"root":["./src/App.tsx","./src/main.tsx","./src/vite-env.d.ts","./src/components/AIPanel.tsx","./src/components/AppendClipPanel.tsx","./src/components/BackgroundMusicPanel.tsx","./src/components/DevPanel.tsx","./src/components/ExportDialog.tsx","./src/components/MarkersPanel.tsx","./src/components/SettingsPanel.tsx","./src/components/SilenceTrimmerPanel.tsx","./src/components/TranscriptEditor.tsx","./src/components/VideoPlayer.tsx","./src/components/VolumePanel.tsx","./src/components/WaveformTimeline.tsx","./src/components/ZoneEditor.tsx","./src/hooks/useKeyboardShortcuts.ts","./src/hooks/useVideoSync.ts","./src/lib/dev-logger.ts","./src/lib/keybindings.ts","./src/lib/tauri-bridge.ts","./src/lib/thumbnails.ts","./src/store/aiStore.ts","./src/store/editorStore.test.ts","./src/store/editorStore.ts","./src/types/project.ts"],"version":"5.9.3"}