close sh;able to save/load projects

frontend/src/store/editorStore.ts

@@ -1,10 +1,11 @@
 import { create } from 'zustand';
 import { temporal } from 'zundo';
-import type { Word, Segment, DeletedRange, TranscriptionResult } from '../types/project';
+import type { Word, Segment, DeletedRange, TranscriptionResult, ProjectFile } from '../types/project';
 
 interface EditorState {
   videoPath: string | null;
   videoUrl: string | null;
+  exportedAudioPath: string | null;  // path to modified audio from a previous export
   words: Word[];
   segments: Segment[];
   deletedRanges: DeletedRange[];
@@ -29,6 +30,8 @@ interface EditorState {
 interface EditorActions {
   setBackendUrl: (url: string) => void;
   loadVideo: (path: string) => void;
+  setExportedAudioPath: (path: string | null) => void;
+  saveProject: () => ProjectFile;
   setTranscription: (result: TranscriptionResult) => void;
   setCurrentTime: (time: number) => void;
   setDuration: (duration: number) => void;
@@ -49,6 +52,7 @@ interface EditorActions {
 const initialState: EditorState = {
   videoPath: null,
   videoUrl: null,
+  exportedAudioPath: null,
   words: [],
   segments: [],
   deletedRanges: [],
@@ -75,6 +79,27 @@ export const useEditorStore = create<EditorState & EditorActions>()(
 
       setBackendUrl: (url) => set({ backendUrl: url }),
 
+      setExportedAudioPath: (path) => set({ exportedAudioPath: path }),
+
+      saveProject: (): ProjectFile => {
+        const { videoPath, words, segments, deletedRanges, language, exportedAudioPath } = get();
+        if (!videoPath) throw new Error('No video loaded');
+        const now = new Date().toISOString();
+        // Strip globalStartIndex (runtime-only field) before persisting
+        const persistSegments = segments.map(({ globalStartIndex: _drop, ...rest }) => rest);
+        return {
+          version: 1,
+          videoPath,
+          exportedAudioPath: exportedAudioPath ?? undefined,
+          words,
+          segments: persistSegments as unknown as Segment[],
+          deletedRanges,
+          language,
+          createdAt: now,  // will be overwritten if we track original creation time later
+          modifiedAt: now,
+        };
+      },
+
       loadVideo: (path) => {
         const backend = get().backendUrl;
         const url = `${backend}/file?path=${encodeURIComponent(path)}`;
@@ -225,6 +250,7 @@ export const useEditorStore = create<EditorState & EditorActions>()(
           segments: annotatedSegments,
           deletedRanges: data.deletedRanges || [],
           language: data.language || '',
+          exportedAudioPath: data.exportedAudioPath ?? null,
         });
       },