Polish quiz completion UX, room PNG backgrounds, and habits list order

Polish quiz completion UX, rooms, and app layout.

supabase/migrations/20260525200000_room_png_ids.sql

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+-- Room backgrounds: PNG assets in /public/room with ids room-1 .. room-4.
+
+alter table public.avatar_state
+  alter column room_background set default 'room-1';
+
+update public.avatar_state
+set room_background = case room_background
+  when 'room-day' then 'room-1'
+  when 'room-dusk' then 'room-2'
+  when 'room-night' then 'room-3'
+  when 'room-forest' then 'room-4'
+  when 'room-space' then 'room-1'
+  when 'room-neon' then 'room-1'
+  else room_background
+end
+where room_background in (
+  'room-day',
+  'room-dusk',
+  'room-night',
+  'room-forest',
+  'room-space',
+  'room-neon'
+);
+
+update public.user_items
+set item_id = case item_id
+  when 'room-night' then 'room-3'
+  when 'room-forest' then 'room-4'
+  else item_id
+end
+where item_id in ('room-night', 'room-forest');
+
+delete from public.shop_items
+where id in ('room-night', 'room-forest');
+
+insert into public.shop_items (id, name, type, price, image_path)
+values
+  ('room-3', 'Starlit Night', 'room', 40, '/room/room-3.png'),
+  ('room-4', 'Mystic Forest', 'room', 50, '/room/room-4.png')
+on conflict (id) do update
+set
+  name = excluded.name,
+  type = excluded.type,
+  price = excluded.price,
+  image_path = excluded.image_path;
+
+alter table public.avatar_state
+  drop constraint if exists avatar_state_room_background_check;
+
+alter table public.avatar_state
+  add constraint avatar_state_room_background_check
+  check (
+    room_background in (
+      'room-1',
+      'room-2',
+      'room-3',
+      'room-4'
+    )
+  );