added save as

FEATURES.md

@@ -20,9 +20,9 @@ Features are grouped by priority. Check off items as they are implemented.
 
 - [x] [#007] **Speed adjustment (4th zone type)** — add speed zones as the fourth editable timeline/transcript zone type (after cut, mute, gain), allowing slow/fast playback per range or globally. Backend: `ffmpeg -filter:v setpts` + `atempo`. Common use case: slightly speed up boring sections.
 
-- [ ] [#008] **Cut preview** — before committing a delete, play what the audio will sound like with that section removed (pre-listen across the edit point). Pure frontend using Web Audio API — splice the AudioBuffer and play the join.
+- [x] [#008] **Cut preview** — before committing a delete, play what the audio will sound like with that section removed (pre-listen across the edit point). Pure frontend using Web Audio API — splice the AudioBuffer and play the join.
 
-- [ ] [#009] **Timeline shows output length** — deleted regions should visually collapse (or show as narrow gaps) so the user sees the *output* duration, not just the source duration.
+- [x] [#009] **Timeline shows output length** — deleted regions should visually collapse (or show as narrow gaps) so the user sees the *output* duration, not just the source duration.
 
 ---
 

frontend/src/App.tsx

@@ -33,6 +33,7 @@ type Panel = 'ai' | 'settings' | 'export' | 'silence' | 'zones' | null;
 
 export default function App() {
   const {
+    projectFilePath,
     videoPath,
     exportedAudioPath,
     words,
@@ -48,6 +49,7 @@ export default function App() {
     isTranscribing,
     transcriptionStatus,
     loadVideo,
+    setProjectFilePath,
     setBackendUrl,
     setTranscription,
     setTranscriptionModel,
@@ -179,6 +181,7 @@ export default function App() {
         if (!projectPath) return;
         const content = await window.electronAPI!.readFile(projectPath);
         const data = JSON.parse(content);
+        setProjectFilePath(projectPath);
         loadProjectFromData(data);
         setProjectName(projectPath.split(/[/\\]/).pop()?.replace(/\.aive$/i, '') ?? null);
       } catch (err) {
@@ -188,14 +191,13 @@ export default function App() {
     });
   };
 
-  const handleSaveProject = async (): Promise<boolean> => {
+  const writeProjectToPath = async (path: string): Promise<boolean> => {
     try {
-      const savePath = await window.electronAPI!.saveProject();
-      if (!savePath) return false;
       const data = useEditorStore.getState().saveProject();
-      const path = savePath.endsWith('.aive') ? savePath : `${savePath}.aive`;
+      const resolvedPath = path.endsWith('.aive') ? path : `${path}.aive`;
-      await window.electronAPI!.writeFile(path, JSON.stringify(data, null, 2));
+      await window.electronAPI!.writeFile(resolvedPath, JSON.stringify(data, null, 2));
-      setProjectName(path.split(/[/\\]/).pop()?.replace(/\.aive$/i, '') ?? null);
+      setProjectFilePath(resolvedPath);
+      setProjectName(resolvedPath.split(/[/\\]/).pop()?.replace(/\.aive$/i, '') ?? null);
       if (projectSignature) {
         setLastSavedSignature(projectSignature);
       }
@@ -207,11 +209,26 @@ export default function App() {
     }
   };
 
+  const handleSaveProjectAs = async (): Promise<boolean> => {
+    const savePath = await window.electronAPI!.saveProject();
+    if (!savePath) return false;
+    return writeProjectToPath(savePath);
+  };
+
+  const handleSaveProject = async (): Promise<boolean> => {
+    if (!projectFilePath) {
+      return handleSaveProjectAs();
+    }
+    return writeProjectToPath(projectFilePath);
+  };
+
   const handleOpenFile = async () => {
     await runGuarded(async () => {
       const path = await window.electronAPI!.openFile();
       if (path) {
         setLastSavedSignature(null);
+        setProjectFilePath(null);
+        setProjectName(null);
         loadVideo(path);
         await transcribeVideo(path);
       }
@@ -223,6 +240,8 @@ export default function App() {
       useEditorStore.getState().reset();
       setLastSavedSignature(null);
       setActivePanel(null);
+      setProjectFilePath(null);
+      setProjectName(null);
       setCutMode(false);
       setMuteMode(false);
       setGainMode(false);
@@ -458,6 +477,12 @@ export default function App() {
             onClick={handleSaveProject}
             disabled={words.length === 0}
           />
+          <ToolbarButton
+            icon={<Save className="w-4 h-4" />}
+            label="Save As"
+            onClick={handleSaveProjectAs}
+            disabled={words.length === 0}
+          />
           <ToolbarButton
             icon={<FileInput className="w-4 h-4" />}
             label="Load"

frontend/src/components/WaveformTimeline.tsx

@@ -1,8 +1,9 @@
-import { useRef, useEffect, useCallback, useState } from 'react';
+import { useRef, useEffect, useCallback, useState, useMemo } from 'react';
 import { useEditorStore } from '../store/editorStore';
 import { AlertTriangle } from 'lucide-react';
 
 const RULER_H = 20; // px reserved at top of canvas for the time ruler
+const COLLAPSED_CUT_DISPLAY_SECONDS = 0.08;
 
 type WaveformData = {
   samples: Float32Array;
@@ -103,6 +104,117 @@ function pickInterval(pxPerSec: number): { major: number; minor: number } {
   return { major, minor };
 }
 
+type TimelineSegment = {
+  kind: 'keep' | 'cut';
+  sourceStart: number;
+  sourceEnd: number;
+  displayStart: number;
+  displayEnd: number;
+};
+
+function mergeCutRanges(ranges: Array<{ start: number; end: number }>, maxDuration: number) {
+  const sorted = ranges
+    .map((range) => ({
+      start: Math.max(0, Math.min(maxDuration, range.start)),
+      end: Math.max(0, Math.min(maxDuration, range.end)),
+    }))
+    .filter((range) => range.end > range.start)
+    .sort((a, b) => a.start - b.start);
+
+  const merged: Array<{ start: number; end: number }> = [];
+  for (const range of sorted) {
+    const last = merged[merged.length - 1];
+    if (!last || range.start > last.end) {
+      merged.push({ ...range });
+    } else {
+      last.end = Math.max(last.end, range.end);
+    }
+  }
+  return merged;
+}
+
+function buildTimelineSegments(sourceDuration: number, cutRanges: Array<{ start: number; end: number }>) {
+  if (sourceDuration <= 0) {
+    return { segments: [] as TimelineSegment[], displayDuration: 0 };
+  }
+
+  const mergedCuts = mergeCutRanges(cutRanges, sourceDuration);
+  const segments: TimelineSegment[] = [];
+  let sourceCursor = 0;
+  let displayCursor = 0;
+
+  for (const cutRange of mergedCuts) {
+    if (cutRange.start > sourceCursor) {
+      const keepDuration = cutRange.start - sourceCursor;
+      segments.push({
+        kind: 'keep',
+        sourceStart: sourceCursor,
+        sourceEnd: cutRange.start,
+        displayStart: displayCursor,
+        displayEnd: displayCursor + keepDuration,
+      });
+      displayCursor += keepDuration;
+    }
+
+    const cutDisplayDuration = Math.min(cutRange.end - cutRange.start, COLLAPSED_CUT_DISPLAY_SECONDS);
+    segments.push({
+      kind: 'cut',
+      sourceStart: cutRange.start,
+      sourceEnd: cutRange.end,
+      displayStart: displayCursor,
+      displayEnd: displayCursor + cutDisplayDuration,
+    });
+    displayCursor += cutDisplayDuration;
+    sourceCursor = cutRange.end;
+  }
+
+  if (sourceCursor < sourceDuration) {
+    const keepDuration = sourceDuration - sourceCursor;
+    segments.push({
+      kind: 'keep',
+      sourceStart: sourceCursor,
+      sourceEnd: sourceDuration,
+      displayStart: displayCursor,
+      displayEnd: displayCursor + keepDuration,
+    });
+    displayCursor += keepDuration;
+  }
+
+  return { segments, displayDuration: displayCursor };
+}
+
+function sourceToDisplayTime(time: number, segments: TimelineSegment[], sourceDuration: number) {
+  if (segments.length === 0) return Math.max(0, Math.min(sourceDuration, time));
+  const clampedTime = Math.max(0, Math.min(sourceDuration, time));
+
+  for (const segment of segments) {
+    if (clampedTime <= segment.sourceEnd || segment === segments[segments.length - 1]) {
+      const sourceSpan = Math.max(segment.sourceEnd - segment.sourceStart, 1e-6);
+      const displaySpan = segment.displayEnd - segment.displayStart;
+      const ratio = (clampedTime - segment.sourceStart) / sourceSpan;
+      return segment.displayStart + ratio * displaySpan;
+    }
+  }
+
+  return segments[segments.length - 1].displayEnd;
+}
+
+function displayToSourceTime(time: number, segments: TimelineSegment[], displayDuration: number, sourceDuration: number) {
+  if (segments.length === 0) return Math.max(0, Math.min(sourceDuration, time));
+  const clampedTime = Math.max(0, Math.min(displayDuration, time));
+
+  for (const segment of segments) {
+    if (clampedTime <= segment.displayEnd || segment === segments[segments.length - 1]) {
+      const displaySpan = Math.max(segment.displayEnd - segment.displayStart, 1e-6);
+      const sourceSpan = segment.sourceEnd - segment.sourceStart;
+      const ratio = (clampedTime - segment.displayStart) / displaySpan;
+      return segment.sourceStart + ratio * sourceSpan;
+    }
+  }
+
+  return sourceDuration;
+}
+
 export default function WaveformTimeline({
   cutMode,
   muteMode,
@@ -165,6 +277,12 @@ export default function WaveformTimeline({
   const [showGainZones, setShowGainZones] = useState(true);
   const [showSpeedZones, setShowSpeedZones] = useState(true);
 
+  const sourceDuration = duration || waveformDataRef.current?.duration || 0;
+  const { segments: timelineSegments, displayDuration } = useMemo(
+    () => buildTimelineSegments(sourceDuration, cutRanges),
+    [sourceDuration, cutRanges],
+  );
+
   useEffect(() => {
     if (!videoUrl || !videoPath) return;
     setAudioError(null);
@@ -261,9 +379,10 @@ export default function WaveformTimeline({
     const width = rect.width;
     const height = rect.height;
     const dur = waveformData.duration;
+    const timelineDur = displayDuration || dur;
     const zoom = zoomRef.current;
     const scroll = scrollSecsRef.current;
-    const pxPerSec = (width * zoom) / dur;
+    const pxPerSec = (width * zoom) / timelineDur;
     const sampleRate = waveformData.sampleRate;
     const channelData = waveformData.samples;
 
@@ -323,8 +442,8 @@ export default function WaveformTimeline({
 
     // Draw cut ranges (red overlays)
     for (const range of showCutZones ? cutRanges : []) {
-      const x1 = (range.start - scroll) * pxPerSec;
+      const x1 = (sourceToDisplayTime(range.start, timelineSegments, dur) - scroll) * pxPerSec;
-      const x2 = (range.end - scroll) * pxPerSec;
+      const x2 = (sourceToDisplayTime(range.end, timelineSegments, dur) - scroll) * pxPerSec;
       const isSelected = selectedZone?.type === 'cut' && selectedZone.id === range.id;
       
       ctx.fillStyle = isSelected ? 'rgba(239, 68, 68, 0.5)' : 'rgba(239, 68, 68, 0.3)';
@@ -348,8 +467,8 @@ export default function WaveformTimeline({
 
     // Draw mute ranges (blue overlays)
     for (const range of showMuteZones ? muteRanges : []) {
-      const x1 = (range.start - scroll) * pxPerSec;
+      const x1 = (sourceToDisplayTime(range.start, timelineSegments, dur) - scroll) * pxPerSec;
-      const x2 = (range.end - scroll) * pxPerSec;
+      const x2 = (sourceToDisplayTime(range.end, timelineSegments, dur) - scroll) * pxPerSec;
       const isSelected = selectedZone?.type === 'mute' && selectedZone.id === range.id;
       
       ctx.fillStyle = isSelected ? 'rgba(59, 130, 246, 0.5)' : 'rgba(59, 130, 246, 0.3)';
@@ -373,8 +492,8 @@ export default function WaveformTimeline({
 
     // Draw gain ranges (amber overlays)
     for (const range of showGainZones ? gainRanges : []) {
-      const x1 = (range.start - scroll) * pxPerSec;
+      const x1 = (sourceToDisplayTime(range.start, timelineSegments, dur) - scroll) * pxPerSec;
-      const x2 = (range.end - scroll) * pxPerSec;
+      const x2 = (sourceToDisplayTime(range.end, timelineSegments, dur) - scroll) * pxPerSec;
       const isSelected = selectedZone?.type === 'gain' && selectedZone.id === range.id;
 
       ctx.fillStyle = isSelected ? 'rgba(245, 158, 11, 0.55)' : 'rgba(245, 158, 11, 0.35)';
@@ -397,8 +516,8 @@ export default function WaveformTimeline({
 
     // Draw speed ranges (emerald overlays)
     for (const range of showSpeedZones ? speedRanges : []) {
-      const x1 = (range.start - scroll) * pxPerSec;
+      const x1 = (sourceToDisplayTime(range.start, timelineSegments, dur) - scroll) * pxPerSec;
-      const x2 = (range.end - scroll) * pxPerSec;
+      const x2 = (sourceToDisplayTime(range.end, timelineSegments, dur) - scroll) * pxPerSec;
       const isSelected = selectedZone?.type === 'speed' && selectedZone.id === range.id;
 
       ctx.fillStyle = isSelected ? 'rgba(16, 185, 129, 0.55)' : 'rgba(16, 185, 129, 0.35)';
@@ -432,8 +551,8 @@ export default function WaveformTimeline({
 
     // Draw selection overlay (when in zone mode)
     if ((cutMode || muteMode || gainMode || speedMode) && selectionStart !== null && selectionEnd !== null) {
-      const x1 = (Math.min(selectionStart, selectionEnd) - scroll) * pxPerSec;
+      const x1 = (sourceToDisplayTime(Math.min(selectionStart, selectionEnd), timelineSegments, dur) - scroll) * pxPerSec;
-      const x2 = (Math.max(selectionStart, selectionEnd) - scroll) * pxPerSec;
+      const x2 = (sourceToDisplayTime(Math.max(selectionStart, selectionEnd), timelineSegments, dur) - scroll) * pxPerSec;
       const fillColor = cutMode
         ? 'rgba(239, 68, 68, 0.5)'
         : muteMode
@@ -457,8 +576,8 @@ export default function WaveformTimeline({
     ctx.lineWidth = 1;
 
     for (let x = 0; x < width; x++) {
-      const tStart = scroll + x / pxPerSec;
+      const tStart = displayToSourceTime(scroll + x / pxPerSec, timelineSegments, timelineDur, dur);
-      const tEnd = scroll + (x + 1) / pxPerSec;
+      const tEnd = displayToSourceTime(scroll + (x + 1) / pxPerSec, timelineSegments, timelineDur, dur);
       const sStart = Math.floor(tStart * sampleRate);
       const sEnd = Math.min(Math.ceil(tEnd * sampleRate), channelData.length);
       if (sStart >= channelData.length) break;
@@ -486,10 +605,12 @@ export default function WaveformTimeline({
     gainMode,
     speedMode,
     selectedZone,
+    displayDuration,
     showCutZones,
     showMuteZones,
     showGainZones,
     showSpeedZones,
+    timelineSegments,
   ]);
 
   // Keep the ref in sync with the latest drawStaticWaveform closure
@@ -515,6 +636,7 @@ export default function WaveformTimeline({
 
       const video = document.querySelector('video') as HTMLVideoElement | null;
       const dur = waveformDataRef.current?.duration ?? 0;
+      const timelineDur = displayDuration || dur;
 
       const dpr = window.devicePixelRatio || 1;
       const rect = headCanvas.getBoundingClientRect();
@@ -529,17 +651,18 @@ export default function WaveformTimeline({
       ctx.clearRect(0, 0, width, height);
 
       if (dur > 0 && video) {
-        const pxPerSec = (width * zoomRef.current) / dur;
+        const pxPerSec = (width * zoomRef.current) / timelineDur;
-        let px = (video.currentTime - scrollSecsRef.current) * pxPerSec;
+        const displayTime = sourceToDisplayTime(video.currentTime, timelineSegments, dur);
+        let px = (displayTime - scrollSecsRef.current) * pxPerSec;
 
         // If the playhead is off-screen (e.g. after a seek from the transcript),
         // scroll so it's centered and redraw the static waveform layer.
         if (px < 0 || px > width) {
           const visibleSecs = width / pxPerSec;
-          const maxScroll = Math.max(0, dur - visibleSecs);
+          const maxScroll = Math.max(0, timelineDur - visibleSecs);
-          scrollSecsRef.current = Math.max(0, Math.min(maxScroll, video.currentTime - visibleSecs / 2));
+          scrollSecsRef.current = Math.max(0, Math.min(maxScroll, displayTime - visibleSecs / 2));
           drawStaticWaveformRef.current();
-          px = (video.currentTime - scrollSecsRef.current) * pxPerSec;
+          px = (displayTime - scrollSecsRef.current) * pxPerSec;
         }
 
         ctx.beginPath();
@@ -555,7 +678,7 @@ export default function WaveformTimeline({
 
     rafRef.current = requestAnimationFrame(tick);
     return () => cancelAnimationFrame(rafRef.current);
-  }, [videoUrl]);
+  }, [videoUrl, displayDuration, timelineSegments]);
 
   useEffect(() => {
     const observer = new ResizeObserver(() => {
@@ -572,28 +695,29 @@ export default function WaveformTimeline({
     const dur = waveformDataRef.current?.duration;
     if (!dur) return;
     const width = canvas.getBoundingClientRect().width;
+    const timelineDur = displayDuration || dur;
 
     if (e.ctrlKey || e.metaKey) {
       // Zoom around the cursor position
       const mouseX = e.clientX - canvas.getBoundingClientRect().left;
-      const pxPerSecBefore = (width * zoomRef.current) / dur;
+      const pxPerSecBefore = (width * zoomRef.current) / timelineDur;
       const timeCursor = scrollSecsRef.current + mouseX / pxPerSecBefore;
       const factor = e.deltaY < 0 ? 1.25 : 1 / 1.25;
       zoomRef.current = Math.max(1, Math.min(100, zoomRef.current * factor));
-      const pxPerSecAfter = (width * zoomRef.current) / dur;
+      const pxPerSecAfter = (width * zoomRef.current) / timelineDur;
       scrollSecsRef.current = timeCursor - mouseX / pxPerSecAfter;
     } else {
       // Scroll horizontally
-      const pxPerSec = (width * zoomRef.current) / dur;
+      const pxPerSec = (width * zoomRef.current) / timelineDur;
       scrollSecsRef.current += (e.deltaY || e.deltaX) / pxPerSec * 1.5;
     }
 
     // Clamp scroll
-    const pxPerSec = (width * zoomRef.current) / dur;
+    const pxPerSec = (width * zoomRef.current) / timelineDur;
-    const maxScroll = Math.max(0, dur - width / pxPerSec);
+    const maxScroll = Math.max(0, timelineDur - width / pxPerSec);
     scrollSecsRef.current = Math.max(0, Math.min(scrollSecsRef.current, maxScroll));
     drawStaticWaveform();
-  }, [drawStaticWaveform]);
+  }, [displayDuration, drawStaticWaveform]);
 
   const seekToClientX = useCallback((clientX: number) => {
     const canvas = headCanvasRef.current;
@@ -601,12 +725,14 @@ export default function WaveformTimeline({
     if (!canvas || !dur) return;
     const rect = canvas.getBoundingClientRect();
     const x = clientX - rect.left;
-    const pxPerSec = (rect.width * zoomRef.current) / dur;
+    const timelineDur = displayDuration || dur;
-    const newTime = Math.max(0, Math.min(dur, scrollSecsRef.current + x / pxPerSec));
+    const pxPerSec = (rect.width * zoomRef.current) / timelineDur;
+    const displayTime = Math.max(0, Math.min(timelineDur, scrollSecsRef.current + x / pxPerSec));
+    const newTime = displayToSourceTime(displayTime, timelineSegments, timelineDur, dur);
     setCurrentTime(newTime);
     const video = document.querySelector('video') as HTMLVideoElement | null;
     if (video) video.currentTime = newTime;
-  }, [setCurrentTime]);
+  }, [displayDuration, setCurrentTime, timelineSegments]);
 
   const clientXToTime = useCallback((clientX: number): number => {
     const canvas = headCanvasRef.current;
@@ -614,9 +740,11 @@ export default function WaveformTimeline({
     if (!canvas || !dur) return 0;
     const rect = canvas.getBoundingClientRect();
     const x = clientX - rect.left;
-    const pxPerSec = (rect.width * zoomRef.current) / dur;
+    const timelineDur = displayDuration || dur;
-    return Math.max(0, Math.min(dur, scrollSecsRef.current + x / pxPerSec));
+    const pxPerSec = (rect.width * zoomRef.current) / timelineDur;
-  }, []);
+    const displayTime = Math.max(0, Math.min(timelineDur, scrollSecsRef.current + x / pxPerSec));
+    return displayToSourceTime(displayTime, timelineSegments, timelineDur, dur);
+  }, [displayDuration, timelineSegments]);
 
   const getZoneAtPosition = useCallback((clientX: number, clientY: number, forHover: boolean = false) => {
     const dur = waveformDataRef.current?.duration;
@@ -626,7 +754,8 @@ export default function WaveformTimeline({
     const rect = canvas.getBoundingClientRect();
     const x = clientX - rect.left;
     const y = clientY - rect.top;
-    const pxPerSec = (rect.width * zoomRef.current) / dur;
+    const timelineDur = displayDuration || dur;
+    const pxPerSec = (rect.width * zoomRef.current) / timelineDur;
     const scroll = scrollSecsRef.current;
     const waveTop = RULER_H + 1;
     const waveH = canvas.height - waveTop;
@@ -638,8 +767,8 @@ export default function WaveformTimeline({
 
     // Check cut ranges
     for (const range of showCutZones ? cutRanges : []) {
-      const rangeX1 = (range.start - scroll) * pxPerSec;
+      const rangeX1 = (sourceToDisplayTime(range.start, timelineSegments, dur) - scroll) * pxPerSec;
-      const rangeX2 = (range.end - scroll) * pxPerSec;
+      const rangeX2 = (sourceToDisplayTime(range.end, timelineSegments, dur) - scroll) * pxPerSec;
       const isSelected = selectedZone?.type === 'cut' && selectedZone.id === range.id;
 
       if (forHover && isSelected) {
@@ -680,8 +809,8 @@ export default function WaveformTimeline({
 
     // Check mute ranges
     for (const range of showMuteZones ? muteRanges : []) {
-      const rangeX1 = (range.start - scroll) * pxPerSec;
+      const rangeX1 = (sourceToDisplayTime(range.start, timelineSegments, dur) - scroll) * pxPerSec;
-      const rangeX2 = (range.end - scroll) * pxPerSec;
+      const rangeX2 = (sourceToDisplayTime(range.end, timelineSegments, dur) - scroll) * pxPerSec;
       const isSelected = selectedZone?.type === 'mute' && selectedZone.id === range.id;
 
       if (forHover && isSelected) {
@@ -722,8 +851,8 @@ export default function WaveformTimeline({
 
     // Check gain ranges
     for (const range of showGainZones ? gainRanges : []) {
-      const rangeX1 = (range.start - scroll) * pxPerSec;
+      const rangeX1 = (sourceToDisplayTime(range.start, timelineSegments, dur) - scroll) * pxPerSec;
-      const rangeX2 = (range.end - scroll) * pxPerSec;
+      const rangeX2 = (sourceToDisplayTime(range.end, timelineSegments, dur) - scroll) * pxPerSec;
       const isSelected = selectedZone?.type === 'gain' && selectedZone.id === range.id;
 
       if (forHover && isSelected) {
@@ -757,8 +886,8 @@ export default function WaveformTimeline({
 
     // Check speed ranges
     for (const range of showSpeedZones ? speedRanges : []) {
-      const rangeX1 = (range.start - scroll) * pxPerSec;
+      const rangeX1 = (sourceToDisplayTime(range.start, timelineSegments, dur) - scroll) * pxPerSec;
-      const rangeX2 = (range.end - scroll) * pxPerSec;
+      const rangeX2 = (sourceToDisplayTime(range.end, timelineSegments, dur) - scroll) * pxPerSec;
       const isSelected = selectedZone?.type === 'speed' && selectedZone.id === range.id;
 
       if (forHover && isSelected) {
@@ -791,7 +920,7 @@ export default function WaveformTimeline({
     }
 
     return null;
-  }, [cutRanges, muteRanges, gainRanges, speedRanges, selectedZone, showCutZones, showMuteZones, showGainZones, showSpeedZones]);
+  }, [cutRanges, muteRanges, gainRanges, speedRanges, selectedZone, showCutZones, showMuteZones, showGainZones, showSpeedZones, displayDuration, timelineSegments]);
 
   const handleMouseMove = useCallback((e: React.MouseEvent<HTMLCanvasElement>) => {
     if (isDragging) return; // Don't change cursor while dragging

frontend/src/components/ZoneEditor.tsx

@@ -1,9 +1,10 @@
-import { useCallback, useEffect, useRef, useState } from 'react';
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { useEditorStore } from '../store/editorStore';
 import { Trash2, Scissors, Volume2, SlidersHorizontal, Gauge, Play } from 'lucide-react';
 
 export default function ZoneEditor() {
   const [viewMode, setViewMode] = useState<'all' | 'cut' | 'mute' | 'gain' | 'speed'>('all');
+  const [focusedZone, setFocusedZone] = useState<{ type: 'cut' | 'mute' | 'gain' | 'speed'; id: string } | null>(null);
   const previewFrameRef = useRef<number | null>(null);
   
   const {
@@ -68,7 +69,10 @@ export default function ZoneEditor() {
 
   const renderPreviewButton = (start: number, end: number, accentClass: string) => (
     <button
-      onClick={() => previewZone(start, end)}
+      onClick={(e) => {
+        e.stopPropagation();
+        previewZone(start, end);
+      }}
       className={`p-1 rounded opacity-0 group-hover:opacity-100 transition-opacity ${accentClass}`}
       title={`Play ${zonePreviewPaddingSeconds.toFixed(2)}s before and after zone`}
     >
@@ -91,6 +95,53 @@ export default function ZoneEditor() {
     }
   };
 
+  const activeFocusedZone = useMemo(() => {
+    if (!focusedZone) return null;
+    const exists = focusedZone.type === 'cut'
+      ? cutRanges.some((range) => range.id === focusedZone.id)
+      : focusedZone.type === 'mute'
+        ? muteRanges.some((range) => range.id === focusedZone.id)
+        : focusedZone.type === 'gain'
+          ? gainRanges.some((range) => range.id === focusedZone.id)
+          : speedRanges.some((range) => range.id === focusedZone.id);
+    return exists ? focusedZone : null;
+  }, [cutRanges, focusedZone, gainRanges, muteRanges, speedRanges]);
+
+  const isZoneFocused = useCallback(
+    (type: 'cut' | 'mute' | 'gain' | 'speed', id: string) => activeFocusedZone?.type === type && activeFocusedZone.id === id,
+    [activeFocusedZone],
+  );
+
+  const removeZone = useCallback((type: 'cut' | 'mute' | 'gain' | 'speed', id: string) => {
+    if (type === 'cut') removeCutRange(id);
+    else if (type === 'mute') removeMuteRange(id);
+    else if (type === 'gain') removeGainRange(id);
+    else removeSpeedRange(id);
+    setFocusedZone((current) => (current?.type === type && current.id === id ? null : current));
+  }, [removeCutRange, removeGainRange, removeMuteRange, removeSpeedRange]);
+
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      const target = e.target as HTMLElement | null;
+      if (target && (target.tagName === 'INPUT' || target.tagName === 'TEXTAREA' || target.tagName === 'SELECT')) {
+        return;
+      }
+
+      if (e.key === 'Escape') {
+        setFocusedZone(null);
+        return;
+      }
+
+      if ((e.key === 'Delete' || e.key === 'Backspace') && activeFocusedZone) {
+        e.preventDefault();
+        removeZone(activeFocusedZone.type, activeFocusedZone.id);
+      }
+    };
+
+    window.addEventListener('keydown', handleKeyDown, { capture: true });
+    return () => window.removeEventListener('keydown', handleKeyDown, { capture: true });
+  }, [activeFocusedZone, removeZone]);
+
   return (
     <div className="p-4 space-y-4">
       <div className="space-y-2">
@@ -200,7 +251,8 @@ export default function ZoneEditor() {
                 {cutRanges.map((range) => (
                   <div
                     key={range.id}
-                    className={`px-2 py-1.5 rounded border text-xs flex items-center gap-2 group ${getZoneTypeColor('cut')}`}
+                    onClick={() => setFocusedZone({ type: 'cut', id: range.id })}
+                    className={`px-2 py-1.5 rounded border text-xs flex items-center gap-2 group cursor-pointer transition-colors ${getZoneTypeColor('cut')} ${isZoneFocused('cut', range.id) ? 'ring-1 ring-red-400 border-red-400/80 bg-red-500/12' : ''}`}
                   >
                     <div className="flex-1 min-w-0">
                       <div className="font-medium truncate">
@@ -210,7 +262,10 @@ export default function ZoneEditor() {
                     </div>
                     {renderPreviewButton(range.start, range.end, 'hover:bg-red-500/20 text-red-500/70 hover:text-red-500')}
                     <button
-                      onClick={() => removeCutRange(range.id)}
+                      onClick={(e) => {
+                        e.stopPropagation();
+                        removeZone('cut', range.id);
+                      }}
                       className="p-1 rounded hover:bg-red-500/20 text-red-500/70 hover:text-red-500 opacity-0 group-hover:opacity-100 transition-opacity"
                       title="Delete cut zone"
                     >
@@ -233,7 +288,8 @@ export default function ZoneEditor() {
                 {muteRanges.map((range) => (
                   <div
                     key={range.id}
-                    className={`px-2 py-1.5 rounded border text-xs flex items-center gap-2 group ${getZoneTypeColor('mute')}`}
+                    onClick={() => setFocusedZone({ type: 'mute', id: range.id })}
+                    className={`px-2 py-1.5 rounded border text-xs flex items-center gap-2 group cursor-pointer transition-colors ${getZoneTypeColor('mute')} ${isZoneFocused('mute', range.id) ? 'ring-1 ring-orange-400 border-orange-400/80 bg-orange-500/12' : ''}`}
                   >
                     <div className="flex-1 min-w-0">
                       <div className="font-medium truncate">
@@ -243,7 +299,10 @@ export default function ZoneEditor() {
                     </div>
                     {renderPreviewButton(range.start, range.end, 'hover:bg-orange-500/20 text-orange-500/70 hover:text-orange-500')}
                     <button
-                      onClick={() => removeMuteRange(range.id)}
+                      onClick={(e) => {
+                        e.stopPropagation();
+                        removeZone('mute', range.id);
+                      }}
                       className="p-1 rounded hover:bg-orange-500/20 text-orange-500/70 hover:text-orange-500 opacity-0 group-hover:opacity-100 transition-opacity"
                       title="Delete mute zone"
                     >
@@ -293,7 +352,8 @@ export default function ZoneEditor() {
                 {gainRanges.map((range) => (
                   <div
                     key={range.id}
-                    className={`px-2 py-1.5 rounded border text-xs flex items-center gap-2 group ${getZoneTypeColor('gain')}`}
+                    onClick={() => setFocusedZone({ type: 'gain', id: range.id })}
+                    className={`px-2 py-1.5 rounded border text-xs flex items-center gap-2 group cursor-pointer transition-colors ${getZoneTypeColor('gain')} ${isZoneFocused('gain', range.id) ? 'ring-1 ring-amber-400 border-amber-400/80 bg-amber-500/12' : ''}`}
                   >
                     <div className="flex-1 min-w-0">
                       <div className="font-medium truncate">
@@ -309,13 +369,17 @@ export default function ZoneEditor() {
                       max={24}
                       step={0.5}
                       value={range.gainDb}
+                      onClick={(e) => e.stopPropagation()}
                       onChange={(e) => updateGainRange(range.id, Number(e.target.value) || 0)}
                       className="w-16 px-1.5 py-0.5 text-xs bg-editor-surface border border-editor-border rounded focus:border-editor-accent focus:outline-none"
                       title="Gain dB"
                     />
                     {renderPreviewButton(range.start, range.end, 'hover:bg-amber-500/20 text-amber-500/70 hover:text-amber-500')}
                     <button
-                      onClick={() => removeGainRange(range.id)}
+                      onClick={(e) => {
+                        e.stopPropagation();
+                        removeZone('gain', range.id);
+                      }}
                       className="p-1 rounded hover:bg-amber-500/20 text-amber-500/70 hover:text-amber-500 opacity-0 group-hover:opacity-100 transition-opacity"
                       title="Delete gain zone"
                     >
@@ -338,7 +402,8 @@ export default function ZoneEditor() {
                 {speedRanges.map((range) => (
                   <div
                     key={range.id}
-                    className={`px-2 py-1.5 rounded border text-xs flex items-center gap-2 group ${getZoneTypeColor('speed')}`}
+                    onClick={() => setFocusedZone({ type: 'speed', id: range.id })}
+                    className={`px-2 py-1.5 rounded border text-xs flex items-center gap-2 group cursor-pointer transition-colors ${getZoneTypeColor('speed')} ${isZoneFocused('speed', range.id) ? 'ring-1 ring-emerald-400 border-emerald-400/80 bg-emerald-500/12' : ''}`}
                   >
                     <div className="flex-1 min-w-0">
                       <div className="font-medium truncate">
@@ -354,13 +419,17 @@ export default function ZoneEditor() {
                       max={4}
                       step={0.05}
                       value={range.speed}
+                      onClick={(e) => e.stopPropagation()}
                       onChange={(e) => updateSpeedRange(range.id, Number(e.target.value) || 1)}
                       className="w-16 px-1.5 py-0.5 text-xs bg-editor-surface border border-editor-border rounded focus:border-editor-accent focus:outline-none"
                       title="Speed multiplier"
                     />
                     {renderPreviewButton(range.start, range.end, 'hover:bg-emerald-500/20 text-emerald-500/70 hover:text-emerald-500')}
                     <button
-                      onClick={() => removeSpeedRange(range.id)}
+                      onClick={(e) => {
+                        e.stopPropagation();
+                        removeZone('speed', range.id);
+                      }}
                       className="p-1 rounded hover:bg-emerald-500/20 text-emerald-500/70 hover:text-emerald-500 opacity-0 group-hover:opacity-100 transition-opacity"
                       title="Delete speed zone"
                     >

frontend/src/hooks/useKeyboardShortcuts.ts

@@ -120,7 +120,9 @@ export function useKeyboardShortcuts() {
         // --- Ctrl+S: save project ---
         case e.key === 's' && (e.ctrlKey || e.metaKey): {
           e.preventDefault();
-          saveProject();
+          const saveBtn = document.querySelector('[title="Save"]') as HTMLButtonElement | null;
+          if (saveBtn) saveBtn.click();
+          else saveProject();
           return;
         }
 
@@ -155,33 +157,32 @@ async function saveProject() {
   if (!state.videoPath || state.words.length === 0) return;
 
   try {
-    const projectData = {
+    const projectData = state.saveProject();
-      version: 1,
+    let outputPath = state.projectFilePath;
-      videoPath: state.videoPath,
-      words: state.words,
-      segments: state.segments,
-      language: state.language,
-      createdAt: new Date().toISOString(),
-      modifiedAt: new Date().toISOString(),
-    };
 
-    const outputPath = await window.electronAPI?.saveFile({
+    if (!outputPath) {
-      defaultPath: state.videoPath.replace(/\.[^.]+$/, '.aive'),
+      outputPath = await window.electronAPI?.saveFile({
-      filters: [{ name: 'TalkEdit Project', extensions: ['aive'] }],
+        defaultPath: state.videoPath.replace(/\.[^.]+$/, '.aive'),
-    });
+        filters: [{ name: 'TalkEdit Project', extensions: ['aive'] }],
+      });
+    }
 
-    if (outputPath) {
+    if (!outputPath) return;
-      if (window.electronAPI?.writeFile) {
+
-        await window.electronAPI.writeFile(outputPath, JSON.stringify(projectData, null, 2));
+    const resolvedPath = outputPath.endsWith('.aive') ? outputPath : `${outputPath}.aive`;
-      } else {
+
-        const blob = new Blob([JSON.stringify(projectData, null, 2)], { type: 'application/json' });
+    if (window.electronAPI?.writeFile) {
-        const url = URL.createObjectURL(blob);
+      await window.electronAPI.writeFile(resolvedPath, JSON.stringify(projectData, null, 2));
-        const a = document.createElement('a');
+      useEditorStore.getState().setProjectFilePath(resolvedPath);
-        a.href = url;
+    } else {
-        a.download = outputPath.split(/[\\/]/).pop() || 'project.aive';
+      const blob = new Blob([JSON.stringify(projectData, null, 2)], { type: 'application/json' });
-        a.click();
+      const url = URL.createObjectURL(blob);
-        URL.revokeObjectURL(url);
+      const a = document.createElement('a');
-      }
+      a.href = url;
+      a.download = resolvedPath.split(/[\\/]/).pop() || 'project.aive';
+      a.click();
+      URL.revokeObjectURL(url);
+      useEditorStore.getState().setProjectFilePath(resolvedPath);
     }
   } catch (err) {
     console.error('Failed to save project:', err);

frontend/src/store/editorStore.ts

@@ -15,6 +15,7 @@ import type {
 } from '../types/project';
 
 interface EditorState {
+  projectFilePath: string | null;
   videoPath: string | null;
   videoUrl: string | null;
   exportedAudioPath: string | null;  // path to modified audio from a previous export
@@ -48,6 +49,7 @@ interface EditorState {
 
 interface EditorActions {
   setBackendUrl: (url: string) => void;
+  setProjectFilePath: (path: string | null) => void;
   loadVideo: (path: string) => void;
   setExportedAudioPath: (path: string | null) => void;
   setTranscriptionModel: (model: string | null) => void;
@@ -101,6 +103,7 @@ function getStoredZonePreviewPaddingSeconds() {
 }
 
 const initialState: EditorState = {
+  projectFilePath: null,
   videoPath: null,
   videoUrl: null,
   exportedAudioPath: null,
@@ -163,6 +166,8 @@ export const useEditorStore = create<EditorState & EditorActions>()(
 
       setBackendUrl: (url) => set({ backendUrl: url }),
 
+      setProjectFilePath: (path) => set({ projectFilePath: path }),
+
       setExportedAudioPath: (path) => set({ exportedAudioPath: path }),
 
       setTranscriptionModel: (model) => set({ transcriptionModel: model }),
@@ -203,6 +208,7 @@ export const useEditorStore = create<EditorState & EditorActions>()(
           ...initialState,
           backendUrl,
           zonePreviewPaddingSeconds,
+          projectFilePath: null,
           videoPath: path,
           videoUrl: url,
         });
@@ -478,7 +484,7 @@ export const useEditorStore = create<EditorState & EditorActions>()(
       },
 
       loadProject: (data) => {
-        const { backendUrl, zonePreviewPaddingSeconds } = get();
+        const { backendUrl, zonePreviewPaddingSeconds, projectFilePath } = get();
         const url = `${backendUrl}/file?path=${encodeURIComponent(data.videoPath)}`;
 
         let globalIdx = 0;
@@ -492,6 +498,7 @@ export const useEditorStore = create<EditorState & EditorActions>()(
           ...initialState,
           backendUrl,
           zonePreviewPaddingSeconds,
+          projectFilePath,
           videoPath: data.videoPath,
           videoUrl: url,
           words: data.words || [],
@@ -514,7 +521,7 @@ export const useEditorStore = create<EditorState & EditorActions>()(
 
       reset: () => {
         const { zonePreviewPaddingSeconds } = get();
-        set({ ...initialState, zonePreviewPaddingSeconds });
+        set({ ...initialState, zonePreviewPaddingSeconds, projectFilePath: null });
       },
     }),
     { limit: 100 },