feat: add persistent document handling and protect note drafts

Add HTTP PaddleOCR-VL settings and shared document previews for chat and knowledge imports. Preserve attachment originals and parsed assets across drafts, messages and queues; support explicit image OCR, selecting document images into a conversation draft, and restoring queued input for editing.

Protect unsaved note bodies and titles during navigation and asynchronous updates. Match canvas analysis to source revisions, invalidate affected comments, preserve annotations during pagination, and provide a resizable record index with saved width preferences.

Existing OCR settings retain local behavior. Historical attachments without saved originals are not reconstructed. Advanced OCR options depend on the configured service; image sending depends on the effective model and Runtime.

Validation: full typecheck and lint passed; 477 focused tests passed across 12 files; staged whitespace checks passed. The full repository suite was not rerun for this commit.

Release note: Keep note drafts safe while switching workspaces, resize the record index, and revisit saved document attachments with OCR previews and selected images in chat.

src/main/assistant/assistant-database.test.ts

@@ -21,6 +21,44 @@ import type { ImageOperation } from '../../shared/image-generation-contracts'
 
 const temporaryDirectories: string[] = []
 
+it.each(['text-fallback', 'canvas-images'] as const)('invalidates canvas source comments by actual %s input while retaining todo identity', async (inputMode) => {
+  const database = await createDatabase()
+  try {
+    const content = {
+      version: 2 as const, kind: 'paged-canvas' as const,
+      pages: [{ id: 'text-page', width: 794, height: 1123,
+        background: { type: 'template' as const, template: 'blank' as const },
+        objects: [{ type: 'IText', text: 'Context', left: 1 }] }],
+      flow: { ops: [{ insert: 'Task' }, { insert: '\n', attributes: { list: 'unchecked' } }] }, assets: []
+    }
+    const entry = database.createMagicNote({ title: 'Source', content }).entries[0]!
+    const todo = database.listMagicTodos()[0]!
+    const comments = [{ id: randomUUID(), kind: 'summary' as const, content: 'Analysis', inputMode }]
+    database.saveMagicTodoAnalysis({ todoId: todo.id, expectedRevision: todo.revision, sourceEntryRevision: entry.revision, comments })
+    database.saveMagicNoteAnalysis({ entryId: entry.id, expectedRevision: entry.revision, comments })
+    const analyzed = database.getMagicNoteEntry(entry.id)
+    const analyzedTodo = database.getMagicTodo(todo.id)
+    const moved = structuredClone(content)
+    moved.pages[0]!.objects[0]!.left = 50
+    database.updateMagicNoteEntry({ entryId: entry.id, expectedRevision: analyzed.revision, content: moved, plainText: '' })
+    const afterMove = database.getMagicNoteEntry(entry.id)
+    const todoAfterMove = database.getMagicTodo(todo.id)
+    expect(afterMove.comments.length).toBe(inputMode === 'text-fallback' ? 1 : 0)
+    expect(todoAfterMove.comments.length).toBe(inputMode === 'text-fallback' ? 1 : 0)
+    expect(todoAfterMove.revision).toBe(analyzedTodo.revision + (inputMode === 'canvas-images' ? 1 : 0))
+    if (inputMode === 'text-fallback') {
+      // Inserting a blank first page leaves plainText identical but changes cited page numbers.
+      moved.pages.unshift({ ...moved.pages[0]!, id: 'blank-page', objects: [] })
+      database.updateMagicNoteEntry({ entryId: entry.id, expectedRevision: afterMove.revision, content: moved, plainText: '' })
+      expect(database.getMagicNoteEntry(entry.id)).toMatchObject({ plainText: afterMove.plainText, comments: [] })
+      expect(database.getMagicTodo(todo.id)).toMatchObject({ id: todo.id, comments: [], revision: todoAfterMove.revision + 1 })
+    }
+    expect(() => database.saveMagicTodoAnalysis({ todoId: todo.id, expectedRevision: database.getMagicTodo(todo.id).revision,
+      sourceEntryRevision: entry.revision, comments })).toThrow('来源记录已被更新')
+    expect(() => database.saveMagicTodoAnalysis({ todoId: todo.id, expectedRevision: database.getMagicTodo(todo.id).revision, comments })).toThrow('来源记录已被更新')
+  } finally { database.close() }
+})
+
 it('roundtrips canvas assets and keeps todos stable across geometry edits and completion', async () => {
   const database = await createDatabase()
   try {