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/knowledge/knowledge-database.test.ts

@@ -86,7 +86,7 @@ describe('KnowledgeDatabase', () => {
     const inspection = new DatabaseSync(path)
     expect(
       inspection.prepare('PRAGMA user_version').get()
-    ).toEqual({ user_version: 12 })
+    ).toEqual({ user_version: 13 })
     expect(
       inspection
         .prepare('SELECT version FROM schema_migrations ORDER BY version')
@@ -103,7 +103,8 @@ describe('KnowledgeDatabase', () => {
       { version: 9 },
       { version: 10 },
       { version: 11 },
-      { version: 12 }
+      { version: 12 },
+      { version: 13 }
     ])
     inspection.close()
 
@@ -144,14 +145,14 @@ describe('KnowledgeDatabase', () => {
     expect(repaired.listDocuments(knowledgeBase.id)).toHaveLength(1)
     const inspection = new DatabaseSync(path)
     expect(inspection.prepare('PRAGMA user_version').get()).toEqual({
-      user_version: 12
+      user_version: 13
     })
     inspection.close()
   })
 
   it.each([
-    ['migration version', 'INSERT INTO schema_migrations VALUES (13, ?)', true],
-    ['user version', 'PRAGMA user_version = 13', false]
+    ['migration version', 'INSERT INTO schema_migrations VALUES (14, ?)', true],
+    ['user version', 'PRAGMA user_version = 14', false]
   ])('rejects a future %s without downgrading it', async (
     _label,
     statement,
@@ -169,18 +170,18 @@ describe('KnowledgeDatabase', () => {
 
     const unsupported = new KnowledgeDatabase(path)
     expect(() => unsupported.initialize()).toThrow(
-      'newer than supported version 12'
+      'newer than supported version 13'
     )
 
     const inspection = new DatabaseSync(path)
     expect(inspection.prepare('PRAGMA user_version').get()).toEqual({
-      user_version: hasParameter ? 12 : 13
+      user_version: hasParameter ? 13 : 14
     })
     expect(
       inspection
         .prepare('SELECT MAX(version) AS version FROM schema_migrations')
         .get()
-    ).toEqual({ version: hasParameter ? 13 : 12 })
+    ).toEqual({ version: hasParameter ? 14 : 13 })
     inspection.close()
   })
 
@@ -330,7 +331,7 @@ describe('KnowledgeDatabase', () => {
     upgraded.initialize()
     const inspection = new DatabaseSync(path)
     expect(inspection.prepare('PRAGMA user_version').get()).toEqual({
-      user_version: 12
+      user_version: 13
     })
     expect(
       inspection