feat: implement game modes system with letters and words support

- Add GameMode type: 'letters' | 'words' | 'sentences' | 'paragraphs'
- Add gameMode option to GameOptions (defaults to 'letters')
- Create wordLists.ts with curated word lists for each mode
- Update FallingLetter type to track:
  - fullText: complete word/sentence/paragraph
  - charIndex: current character progress in word
- Modify word spawning to pick from mode-specific word list
- Update handleTypedLetter to support multi-character typed sequences:
  - Track progress through word (charIndex)
  - Advance to next character when correct
  - Show complete word only when fully typed
- Enhanced canvas rendering with color-coded progress:
  - Green: completed characters
  - Yellow: current character being typed
  - White: remaining characters
- Add mode selector buttons to example app
- Default to 'words' mode in example for testing
- Full TypeScript support for all modes

src/useGame/useGame.ts

@@ -6,14 +6,15 @@ import { useGameStatus } from "../useGameStatus";
 import { useScore } from "../useScore";
 
 export function useGame(
-  _options?: GameOptions,
+  options?: GameOptions,
   platformHook?: unknown
 ): GameManager {
   const [keyLog, setKeyLog] = useState<KeyLogEntry[]>([]);
+  const gameMode = options?.gameMode ?? 'letters';
 
   const boardManager = useBoard();
   const cursorManager = useCursor();
-  const gameStatusManager = useGameStatus();
+  const gameStatusManager = useGameStatus(undefined, gameMode);
 
   // Wrap renderBoard to include player position
   const renderBoardWrapped = (letters: any = []) => {