- Replace limited 15-timezone list with comprehensive 421 IANA timezones
- Add searchable timezone selector with region grouping for better UX
- Create dedicated timezones.ts file following project conventions
- Support all timezone offsets including 30-min and 45-min offsets
Closes#2935🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <[email protected]>
