test(timeout): copri toggleTimeout e listSpotVideos

- gameState: stato iniziale `timeout: false` e ciclo toggleTimeout.
- nuovo spotUtils.test.js: cartella assente/vuota, filtro .mp4 ordinato,
  estensione case-insensitive.

tests/unit/gameState.test.js

@@ -79,6 +79,10 @@ describe('Game Logic (gameState.js)', () => {
             expect(state.visuForm).toBe(false)
             expect(state.visuStriscia).toBe(true)
         })
+
+        it('dovrebbe avere timeout false', () => {
+            expect(state.timeout).toBe(false)
+        })
     })
 
     // =============================================
@@ -479,6 +483,14 @@ describe('Game Logic (gameState.js)', () => {
             const s = applyAction(state, { type: 'toggleOrder' })
             expect(s.order).toBe(false)
         })
+
+        it('toggleTimeout: false → true → false', () => {
+            expect(state.timeout).toBe(false)
+            const s1 = applyAction(state, { type: 'toggleTimeout' })
+            expect(s1.timeout).toBe(true)
+            const s2 = applyAction(s1, { type: 'toggleTimeout' })
+            expect(s2.timeout).toBe(false)
+        })
     })
 
     // =============================================