Fixed 12 type errors by adding proper type annotations:
Quick Wins Completed:
- do_on_key.js: Added JSDoc types for KeyboardEvent and function parameters
- randomize.js: Added JSDoc types with generic template for array shuffling
- cookie.js: Added JSDoc types for Request API
- stripHtmlTags.ts: Added TypeScript types for string parameter
Progress: 12/1239 errors fixed (Quick Wins - Category 1 partial)
Created TODO_cleanup.md to track remaining 1227 type errors systematically.
