Fix tetris fullscreen

Restore and unify fullscreen across games by reintroducing useBrowserFullscreen in Tetris and aligning fullscreen behavior with other games. Ensure mobile auto-fullscreen and Escape handling work, and fix related imports and toggle logic.

X-Lovable-Edit-ID: edt-ab4b55a8-5fc4-4eb0-a4d8-1e13abc55f69

src/pages/Tetris.tsx

@@ -5,6 +5,7 @@ import { useAchievements } from '@/contexts/AchievementsContext';
 import { Link } from 'react-router-dom';
 import GlitchCrash from '@/components/GlitchCrash';
 import { Maximize2, Minimize2, Users, User } from 'lucide-react';
+import { useBrowserFullscreen } from '@/hooks/useGameDimensions';
 import GameTouchButton from '@/components/GameTouchButton';
 import { MobileControlsDock, MobileControlsSpacer } from '@/components/MobileControlsDock';
 
@@ -118,6 +119,8 @@ const Tetris = () => {
   const [isFullscreen, setIsFullscreen] = useState(false);
   const gameRef = useRef<HTMLDivElement>(null);
 
+  const { enterFullscreen, exitFullscreen } = useBrowserFullscreen();
+
   const getCellSize = useCallback(() => {
     if (typeof window === 'undefined') return 28;
     const isMobile = window.innerWidth < 768;
@@ -142,21 +145,33 @@ const Tetris = () => {
   useEffect(() => { setCellSize(getCellSize()); }, [isFullscreen, getCellSize, gameMode]);
 
   useEffect(() => {
-    if (gameStarted && isMobile && !isFullscreen) setIsFullscreen(true);
-  }, [gameStarted, isMobile, isFullscreen]);
+    if (gameStarted && isMobile && !isFullscreen) {
+      setIsFullscreen(true);
+      enterFullscreen();
+    }
+  }, [gameStarted, isMobile, isFullscreen, enterFullscreen]);
 
-  const toggleFullscreen = () => {
-    setIsFullscreen(prev => !prev);
+  const toggleFullscreen = async () => {
+    if (!isFullscreen) {
+      setIsFullscreen(true);
+      await enterFullscreen();
+    } else {
+      setIsFullscreen(false);
+      await exitFullscreen();
+    }
     playSound('click');
   };
 
   useEffect(() => {
     const handleEscape = (e: KeyboardEvent) => {
-      if (e.key === 'Escape' && isFullscreen) setIsFullscreen(false);
+      if (e.key === 'Escape' && isFullscreen) {
+        setIsFullscreen(false);
+        exitFullscreen();
+      }
     };
     window.addEventListener('keydown', handleEscape);
     return () => window.removeEventListener('keydown', handleEscape);
-  }, [isFullscreen]);
+  }, [isFullscreen, exitFullscreen]);
 
   useEffect(() => {
     const saved = localStorage.getItem(HIGHSCORE_KEY);