poduck f4332153f4 feat: Add timezone architecture for consistent date/time handling ...

- Create dateUtils.ts with helpers for UTC conversion and timezone display
- Add TimezoneSerializerMixin to include business_timezone in API responses
- Update GeneralSettings timezone dropdown with IANA identifiers
- Apply timezone mixin to Event, TimeBlock, and field mobile serializers
- Document timezone architecture in CLAUDE.md

All times stored in UTC, converted for display based on business timezone.
If business_timezone is null, uses user's local timezone.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2025-12-07 19:39:36 -05:00

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