feat: redesign notifications settings with per-category in-app/push table

- Add notify_new_chapters_push field to AppUser, PATCH /api/profile, and profile loader
- Fix bell panel to reload notifications on every open (not just once on mount)
- Replace flat in-app + push toggles with structured category table (Category | In-app | Push)
- Add browser push master subscribe/unsubscribe row above the table
- Push column toggle disabled until browser is subscribed; shows — when unsupported/denied
- Update Notifications row hint to summarise active channels (In-app · Push / Off)

ui/src/routes/api/profile/+server.ts

@@ -7,7 +7,7 @@ import { log } from '$lib/server/logger';
  * PATCH /api/profile
  *
  * Update mutable profile preferences (currently: notification preferences).
- * Body: { notify_new_chapters?: boolean }
+ * Body: { notify_new_chapters?: boolean, notify_new_chapters_push?: boolean }
  */
 export const PATCH: RequestHandler = async ({ locals, request }) => {
 	if (!locals.user) error(401, 'Not authenticated');
@@ -19,10 +19,13 @@ export const PATCH: RequestHandler = async ({ locals, request }) => {
 		error(400, 'Invalid JSON');
 	}
 
-	const prefs: { notify_new_chapters?: boolean } = {};
+	const prefs: { notify_new_chapters?: boolean; notify_new_chapters_push?: boolean } = {};
 	if (typeof body.notify_new_chapters === 'boolean') {
 		prefs.notify_new_chapters = body.notify_new_chapters;
 	}
+	if (typeof body.notify_new_chapters_push === 'boolean') {
+		prefs.notify_new_chapters_push = body.notify_new_chapters_push;
+	}
 
 	if (Object.keys(prefs).length === 0) {
 		error(400, 'No valid preferences provided');