Optimize note list memory: reduce batch to 40, add lazy loading and throttle PDF rendering

src/app/api/notes/route.ts

@@ -27,7 +27,7 @@ export async function GET(req: NextRequest) {
     const shortcut = sp.get('shortcut') === 'true';
     const sortBy = sp.get('sortBy') || 'updatedAt';
     const sortDir = (sp.get('sortDir') === 'asc' ? 'asc' : 'desc') as 'asc' | 'desc';
-    const limit = Math.min(parseInt(sp.get('limit') || '500', 10) || 500, 2000);
+    const limit = Math.min(parseInt(sp.get('limit') || '50', 10) || 50, 150);
     const offset = parseInt(sp.get('offset') || '0', 10) || 0;
 
     const where = buildNoteWhereClause({