Fix issue where tasks showed as "Overdue" on the server while displaying
"Tomorrow" on the client due to timezone differences between server (UTC)
and user's local timezone.
Changes:
- Add X-Timezone header support to extract user's timezone from requests
- Add TimezoneMiddleware to parse timezone and calculate user's local "today"
- Update task categorization to accept custom time for accurate date comparisons
- Update repository, service, and handler layers to pass timezone-aware time
- Update CORS to allow X-Timezone header
The client now sends the user's IANA timezone (e.g., "America/Los_Angeles")
and the server uses it to determine if a task is overdue based on the
user's local date, not UTC.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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