fix(phase1.4): fix level-up timing in score calculation

- Level up BEFORE adding points, not after
- When foodsEatenRef reaches threshold:
  1. Increment level first
  2. Reset food counter
  3. THEN add points at new level
- Correct flow: eat 2 foods at level 1 (+1,+1=2pts), level up, next food worth +2pts
- Was: eat at level 1, level up happens, get 2pts (wrong level)
- Now: eat at level 1, eat at level 1, level up, next food gets 2pts (correct)

src/useGameStatus/useGameStatus.ts

@@ -90,14 +90,20 @@ export function useGameStatus(
             foodsEatenRef.current += 1;
 
             setScore((prev) => {
-              let newScore = prev + levelRef.current;
+              let newScore = prev;
+              let currentLevel = levelRef.current;
+              
+              // Check if we should level up BEFORE adding points
               if (foodsEatenRef.current >= FOODS_PER_LEVEL) {
-                const newLevel = levelRef.current + 1;
-                levelRef.current = newLevel;
-                setLevel(newLevel);
-                currentFpsRef.current = INITIAL_FPS + (newLevel - 1);
+                currentLevel = levelRef.current + 1;
+                levelRef.current = currentLevel;
+                setLevel(currentLevel);
+                currentFpsRef.current = INITIAL_FPS + (currentLevel - 1);
                 foodsEatenRef.current = 0;
               }
+              
+              // Add points at the current (possibly new) level
+              newScore = prev + currentLevel;
 
               foodManagerRef.current.spawnFood(
                 snakeManagerRef.current.snakeBodyRef.current,