Upgrade TypeScript to 5.8.3 and add .claude/ to gitignore

- Updated TypeScript from ^4.1.3 to ^5.8.3 for latest features and bug fixes
- Added .claude/ directory to gitignore to exclude Claude Code settings

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: danpaz

package-lock.json

@@ -53,7 +53,7 @@
     "tap-spec": "4.1.1",
     "tape": "4.8.0",
     "tape-watch": "2.3.0",
-    "typescript": "^4.1.3",
+    "typescript": "^5.8.3",
     "webpack": "1.12.13"
   },
   "dependencies": {