Show resetting state after game end

tests/unit/ui-server-clock.test.ts

@@ -65,6 +65,27 @@ async function setup() {
 }
 
 describe('Fleet report clock', () => {
+    it('applies game lifecycle events immediately and clears them after an empty report', async () => {
+        const { fleetServers } = await setup();
+        const report = (event: string, time: number) => source.dispatchEvent(new MessageEvent('server-telemetry', {
+            data: JSON.stringify({ serverNow: time, entries: [{ server: 't5_zombie_theater_1', event,
+                receivedAt: new Date(time).toISOString(), players: [] }] })
+        }));
+        emit(epoch, [status(epoch, { players: 1 })]);
+        report('game_end', epoch + 1000);
+        expect(get(fleetServers)[0].game_ended_at).toBe(new Date(epoch + 1000).toISOString());
+        report('heartbeat', epoch + 2000);
+        expect(get(fleetServers)[0].game_ended_at).not.toBeNull();
+        report('game_start', epoch + 3000);
+        expect(get(fleetServers)[0].game_ended_at).toBeNull();
+        report('game_end', epoch + 4000);
+        await vi.advanceTimersByTimeAsync(5000);
+        emit(epoch + 5000, [status(epoch + 5000)]);
+        expect(get(fleetServers)[0].game_ended_at).toBeNull();
+        emit(epoch + 6000, [status(epoch + 6000, { players: 1 })]);
+        expect(get(fleetServers)[0].game_ended_at).toBeNull();
+    });
+
     it.each([-2500, 60_000])('keeps fresh HTTP and streamed reports healthy with a browser clock offset of %i ms', async (offset) => {
         vi.setSystemTime(epoch + offset);
         const { fleetServers, uiNow, refreshFleet } = await setup();