fix(ui): auto-refresh sessions list after deletion

Remove dead loadSessions call from deleteSession controller that was
silently failing due to sessionsLoading guard. The refresh now happens
explicitly in the UI layer after successful deletion.

- src/ui/controllers/sessions.ts: remove internal loadSessions call
- src/ui/app-render.ts: add async onDelete handler with explicit refresh

ui/src/ui/app-render.ts

@@ -301,7 +301,10 @@ export function renderApp(state: AppViewState) {
                 },
                 onRefresh: () => loadSessions(state),
                 onPatch: (key, patch) => patchSession(state, key, patch),
-                onDelete: (key) => deleteSession(state, key),
+                onDelete: async (key) => {
+                  await deleteSession(state, key);
+                  await loadSessions(state);
+                },
               })
             : nothing
         }

ui/src/ui/controllers/sessions.ts

@@ -108,7 +108,6 @@ export async function deleteSession(state: SessionsState, key: string) {
   state.sessionsError = null;
   try {
     await state.client.request("sessions.delete", { key, deleteTranscript: true });
-    await loadSessions(state);
   } catch (err) {
     state.sessionsError = String(err);
   } finally {