- Fix sqlite3.OperationalError: the recipes table uses `title` not `name`;
get_plan_slots JOIN was crashing every list_plans call with a 500,
making the + New week button appear broken (plans were being created
silently but the selector refresh always failed)
- Add migration 032 to add UNIQUE INDEX on meal_plans(week_start)
to prevent duplicate plans accumulating while the button was broken
- Raise HTTP 409 on IntegrityError in create_plan so duplicates produce
a clear error instead of a 500
- Fix mondayOfCurrentWeek to build the date string from local date parts
instead of toISOString(), which converts through UTC and can produce the
wrong calendar day for UTC+ timezones
- Add planCreating/planError state to MealPlanView so button shows
"Creating..." during the request and displays errors inline
