- Change all date scopes from PostgreSQL-specific ::date to DATE() function
which works in both PostgreSQL and SQLite (used in tests)
- Fix ScopeOverdue, ScopeDueSoon, ScopeUpcoming, ScopeDueInRange
- Fix GetOverdueTasks inline query in task_repo.go
- Fix timezone unit tests: due dates must be stored as midnight UTC
(calendar dates), not with timezone info that GORM converts to UTC
- Update TestGetOverdueTasks_Timezone_Tokyo, NewYork, InternationalDateLine
- Update TestGetDueSoonTasks_Timezone_DST
- Add TestIntegration_TimezoneDivergence: proves same task appears in
different kanban columns based on X-Timezone header
- Update TestIntegration_DateBoundaryEdgeCases to use America/New_York
- Update TestIntegration_TasksByResidenceKanban to use America/Los_Angeles
- Add identity-based column membership assertions (columnTaskIDs approach)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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