Upgraded JS modes. Changes: - Removed js2-mode package - Added treesit-auto package - Enabled global-treesit-auto-mode This will automatically: - Use js-ts-mode for JavaScript files - Install tree-sitter grammars on first use - Apply tree-sitter modes to other languages too (JSON, TypeScript, Python, etc.)

Moved from zencoding for html to emmet: Changes: - Package list: zencoding-mode → emmet-mode - html-mode hook: zencoding-mode → emmet-mode