Kyle Pope 1aaa2b3a74 Fix code review findings: security hardening and frontend fixes
Backend:
- Add rate limiting to login (5 attempts / 5 min window)
- Add secure flag to session cookies with helper function
- Add PIN min-length validation via Pydantic field_validator
- Fix naive datetime usage in todos.py (datetime.now() not UTC)
- Disable SQLAlchemy echo in production
- Remove auto-commit from get_db to prevent double commits
- Add lower bound filter to upcoming events query
- Add SECRET_KEY default warning on startup
- Remove create_all from lifespan (Alembic handles migrations)

Frontend:
- Fix ReminderForm remind_at slice for datetime-local input
- Add window.confirm() dialogs on all destructive actions
- Redirect authenticated users away from login screen
- Replace error: any with getErrorMessage helper in LockScreen

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-16 07:49:21 +08:00
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