Implement ST-201 morning check-in flow

supabase/migrations/20260418_create_morning_check_ins.sql

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+create table if not exists public.morning_check_ins (
+  id uuid primary key default gen_random_uuid(),
+  user_id uuid not null references auth.users (id) on delete cascade,
+  check_in_date date not null,
+  energy_score integer not null check (energy_score between 1 and 10),
+  sleep_quality text not null check (sleep_quality in ('goed', 'matig', 'slecht')),
+  created_at timestamptz not null default timezone('utc', now()),
+  updated_at timestamptz not null default timezone('utc', now()),
+  unique (user_id, check_in_date)
+);
+
+grant select, insert, update on table public.morning_check_ins to authenticated;
+
+alter table public.morning_check_ins enable row level security;
+
+drop trigger if exists set_morning_check_ins_updated_at on public.morning_check_ins;
+create trigger set_morning_check_ins_updated_at
+before update on public.morning_check_ins
+for each row
+execute function public.set_updated_at();
+
+drop policy if exists "morning_check_ins_select_own" on public.morning_check_ins;
+create policy "morning_check_ins_select_own"
+on public.morning_check_ins
+for select
+to authenticated
+using ((select auth.uid()) = user_id);
+
+drop policy if exists "morning_check_ins_insert_own" on public.morning_check_ins;
+create policy "morning_check_ins_insert_own"
+on public.morning_check_ins
+for insert
+to authenticated
+with check ((select auth.uid()) = user_id);
+
+drop policy if exists "morning_check_ins_update_own" on public.morning_check_ins;
+create policy "morning_check_ins_update_own"
+on public.morning_check_ins
+for update
+to authenticated
+using ((select auth.uid()) = user_id)
+with check ((select auth.uid()) = user_id);