Fix notes.html: handle wrapped index.json format

kanban/notes.html

@@ -489,7 +489,8 @@
         async function loadNotesIndex() {
             try {
                 const response = await fetch(indexPath + '?t=' + Date.now());
-                notesIndex = await response.json();
+                const data = await response.json();
+                notesIndex = Array.isArray(data) ? data : (data.notes || []);
                 console.log(`Loaded ${notesIndex.length} notes from index.json`);
             } catch (e) {
                 console.error('Failed to load notes index:', e);