feat: implement complete score tracking system

- Track score (starts at 0)
- +1 score and +1 correct for each correct character typed
- -1 score and +1 missed for each wrong character typed
- +1 deaths for each collision with ship
- Score resets when game starts
- All metrics exposed through ScoreManager
- Updated example app UI with colorful scoreboard showing:
  - Time (gray)
  - Score (neutral)
  - Correct (green)
  - Missed (yellow)
  - Deaths (red)
  - Keystrokes (neutral)
- Uses grid layout for organized metric display
- Score cannot go below 0 (clamped to minimum)

example/bun.lock

@@ -5,7 +5,7 @@
       "name": "vimazing-vim-snake-example",
       "dependencies": {
         "@tailwindcss/vite": "^4.1.14",
-        "@vimazing/vim-snake": "file:../",
+        "@vimazing/typing-chud": "file:../",
         "react": "^19.1.1",
         "react-dom": "^19.1.1",
       },
@@ -211,7 +211,7 @@
 
     "@types/react-dom": ["@types/react-dom@19.2.2", "", { "peerDependencies": { "@types/react": "^19.2.0" } }, "sha512-9KQPoO6mZCi7jcIStSnlOWn2nEF3mNmyr3rIAsGnAbQKYbRLyqmeSc39EVgtxXVia+LMT8j3knZLAZAh+xLmrw=="],
 
-    "@vimazing/vim-snake": ["@vimazing/vim-snake@file:..", { "devDependencies": { "@types/node": "^24.7.2", "@types/react": "^19.2.2", "typescript": "~5.9.3" }, "peerDependencies": { "react": "^19.1.1" } }],
+    "@vimazing/typing-chud": ["@vimazing/typing-chud@file:..", { "devDependencies": { "@types/node": "^24.7.2", "@types/react": "^19.2.2", "typescript": "~5.9.3" }, "peerDependencies": { "react": "^19.1.1" } }],
 
     "@vitejs/plugin-react": ["@vitejs/plugin-react@5.0.4", "", { "dependencies": { "@babel/core": "^7.28.4", "@babel/plugin-transform-react-jsx-self": "^7.27.1", "@babel/plugin-transform-react-jsx-source": "^7.27.1", "@rolldown/pluginutils": "1.0.0-beta.38", "@types/babel__core": "^7.20.5", "react-refresh": "^0.17.0" }, "peerDependencies": { "vite": "^4.2.0 || ^5.0.0 || ^6.0.0 || ^7.0.0" } }, "sha512-La0KD0vGkVkSk6K+piWDKRUyg8Rl5iAIKRMH0vMJI0Eg47bq1eOxmoObAaQG37WMW9MSyk7Cs8EIWwJC1PtzKA=="],