debug: add error surfacing for notes-to-self creation

web/src/components/ConversationList.tsx

@@ -25,7 +25,10 @@ export function ConversationList() {
     fetchConversations();
   }, [fetchConversations]);
 
+  const [notesError, setNotesError] = useState<string | null>(null);
+
   const openNotes = async () => {
+    setNotesError(null);
     // Find existing self-DM or create one
     const existing = conversations.find((c) => isSelfDM(c, currentUser?.id || ""));
     if (existing) {
@@ -34,7 +37,10 @@ export function ConversationList() {
     }
     try {
       await createConversation([]);
-    } catch { /* ignore */ }
+    } catch (err) {
+      console.error('Failed to create notes:', err);
+      setNotesError(err instanceof Error ? err.message : 'Failed to create notes');
+    }
   };
 
   return (
@@ -85,6 +91,9 @@ export function ConversationList() {
           );
         })}
       </div>
+      {notesError && (
+        <div className="px-3 py-1 text-gb-red text-xs font-mono">ERR: {notesError}</div>
+      )}
       {showNew && <NewConversationModal onClose={() => setShowNew(false)} />}
     </div>
   );