fix: extract tags client-side for offline notes and server-side on sync

- Import extractTags in notes store to populate tags on optimistic notes
- Re-extract tags on offline update when title or content changes
- Run extractTags + syncNoteTags in processSyncPush after transaction

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/lib/sync/server.ts

@@ -1,12 +1,16 @@
 import { db } from '$lib/server/db/index.js';
 import { notes, syncLog } from '$lib/server/db/schema.js';
 import { eq, gt } from 'drizzle-orm';
+import { extractTags } from '$lib/utils/tags.js';
+import { syncNoteTags } from '$lib/server/tags.js';
 import type { SyncQueueItem } from './idb.js';
 
 /**
  * Process incoming sync changes from client.
  */
 export async function processSyncPush(changes: SyncQueueItem[]): Promise<void> {
+	const noteIdsToSyncTags: string[] = [];
+
 	db.transaction((tx) => {
 		for (const change of changes) {
 			switch (change.operation) {
@@ -48,6 +52,10 @@ export async function processSyncPush(changes: SyncQueueItem[]): Promise<void> {
 							})
 							.run();
 					}
+
+					if (change.data.title !== undefined || change.data.content !== undefined) {
+						noteIdsToSyncTags.push(change.noteId);
+					}
 					break;
 				}
 				case 'delete': {
@@ -66,6 +74,14 @@ export async function processSyncPush(changes: SyncQueueItem[]): Promise<void> {
 				.run();
 		}
 	});
+
+	for (const noteId of noteIdsToSyncTags) {
+		const note = db.select().from(notes).where(eq(notes.id, noteId)).get();
+		if (note) {
+			const content = `${note.title} ${note.content}`;
+			syncNoteTags(noteId, extractTags(content));
+		}
+	}
 }
 
 /**