feat(phase2.1): track total keystrokes via keyLog length

- Expose keyLog.length as totalKeystrokes in ScoreManager
- Pass keyLog from useKeyBindings to useScore hook
- All game inputs (hjkl and platform keys) automatically counted
- Keystroke counter resets when keyLog is cleared (game restart)

src/useGame/useGame.ts

@@ -46,7 +46,7 @@ export function useGame(optionsOrCols: GameOptions | number, rows?: number, plat
     },
   });
 
-  const scoreManager = useScore({ gameStatus });
+  const scoreManager = useScore({ gameStatus, keyLog: keyBindings.keyLog });
 
   // Wrap renderBoard to match Unified API signature
   const renderBoardWrapped = () => {

src/useScore/useScore.ts

@@ -1,12 +1,13 @@
 import { useTimer } from "./hooks/useTimer";
 import { useScoreTime } from "./useScoreTime";
-import type { GameStatus } from "../types";
+import type { GameStatus, KeyLogEntry } from "../types";
 
 export type UseScoreParams = {
   gameStatus: GameStatus;
+  keyLog: KeyLogEntry[];
 };
 
-export function useScore({ gameStatus }: UseScoreParams) {
+export function useScore({ gameStatus, keyLog }: UseScoreParams) {
   const timer = useTimer();
   const { timeValue, startTimer, stopTimer, resetTimer } = timer;
 
@@ -14,7 +15,7 @@ export function useScore({ gameStatus }: UseScoreParams) {
 
   return {
     timeValue,
-    totalKeystrokes: 0, // TODO: Track from keyBindings
+    totalKeystrokes: keyLog.length,
     finalScore: null,   // TODO: Calculate on game-won
     startTimer,
     stopTimer,