Harden dashboard realtime state and controls

tests/dashboard/realtime-repair.test.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it, vi } from 'vitest';
+import { repairRealtimeSnapshots } from '../../apps/dashboard/src/app/realtime-repair.js';
+
+describe('authoritative realtime repair', () => {
+  it('marks snapshots stale and explicitly refetches active observers', async () => {
+    const invalidateQueries = vi.fn().mockResolvedValue(undefined);
+    const refetchQueries = vi.fn().mockResolvedValue(undefined);
+    await repairRealtimeSnapshots({ invalidateQueries, refetchQueries });
+    expect(invalidateQueries).toHaveBeenCalled();
+    expect(refetchQueries).toHaveBeenCalled();
+    expect(refetchQueries).toHaveBeenCalledWith(expect.objectContaining({ type: 'active' }));
+  });
+});