deck contribution sprint 2 + Carte Blanche safeguards — TDD

Sprint 2 UI (game kit applet):
- _applet-game-kit.html: in-use deck → two disabled × buttons, .tt-deck-game-name;
  in-use Carte Blanche → two disabled × buttons, data-current-room-name,
  .tt-token-room-name; tooltip content mirrors kit bag panel (Default, card count,
  description, Stock version)
- gameboard.js buildMiniContent: 'In-Use' for tokens w. data-current-room-name set
- _kit_bag_panel.html: Deck section always renders (placeholder when unequipped)

View safeguards:
- select_role: look up existing deck from prior seat in same room before
  equipped_deck (Carte Blanche multi-seat); only unequip when using equipped_deck
- drop_token Carte: reject 409 if token.current_room is a different room;
  unequip from equipped_trinket on drop

ITs: SelectRoleMultiSeatTest (2), DropTokenViewTest +3 (carte drop, unequip, lock)

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Sonnet 4.6 <noreply@anthropic.com>

src/apps/gameboard/views.py

@@ -4,7 +4,20 @@ from django.shortcuts import get_object_or_404, redirect, render
 from django.utils import timezone
 
 from apps.applets.utils import applet_context, apply_applet_toggle
-from apps.epic.models import DeckVariant, Room
+
+
+def _annotate_deck_in_use(decks, user):
+    """Attach .in_use_room_name to each deck — the name of the active room using it, or None."""
+    active = {
+        ts.deck_variant_id: ts.room.name
+        for ts in TableSeat.objects.filter(
+            gamer=user, deck_variant__isnull=False,
+        ).select_related("room")
+    }
+    for deck in decks:
+        deck.in_use_room_name = active.get(deck.pk)
+    return decks
+from apps.epic.models import DeckVariant, Room, TableSeat
 from apps.epic.utils import rooms_for_user
 from apps.lyric.models import Token
 
@@ -31,7 +44,7 @@ def gameboard(request):
             "carte": carte,
             "equipped_trinket_id": request.user.equipped_trinket_id,
             "equipped_deck_id": request.user.equipped_deck_id,
-            "deck_variants": list(request.user.unlocked_decks.all()),
+            "deck_variants": _annotate_deck_in_use(list(request.user.unlocked_decks.all()), request.user),
             "free_tokens": free_tokens,
             "free_count": len(free_tokens),
             "applets": applet_context(request.user, "gameboard"),
@@ -55,7 +68,7 @@ def toggle_game_applets(request):
             "carte": request.user.tokens.filter(token_type=Token.CARTE).first(),
             "equipped_trinket_id": request.user.equipped_trinket_id,
             "equipped_deck_id": request.user.equipped_deck_id,
-            "deck_variants": list(request.user.unlocked_decks.all()),
+            "deck_variants": _annotate_deck_in_use(list(request.user.unlocked_decks.all()), request.user),
             "free_tokens": free_tokens,
             "free_count": len(free_tokens),
             "my_games": rooms_for_user(request.user),