Fix notes.html: handle wrapped index.json format

kanban/issues.json

@@ -1,5 +1,5 @@
 {
-  "lastUpdated": "2026-01-30T15:23:00Z",
+  "lastUpdated": "2026-01-30T17:37:00.676Z",
   "programs": [
     "ROACONT",
     "ROAGEST",
@@ -26,4 +26,4 @@
       "deadline": null
     }
   ]
-}
+}

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);