refactor: extract apply_applet_toggle, rooms_for_user & natus helpers to utils; DRY toggle views

- epic/utils.py (new): _planet_house, _compute_distinctions, rooms_for_user
- applets/utils.py: apply_applet_toggle replaces 5 copy-pasted toggle loops
- dashboard/views.py: use apply_applet_toggle; fix double free_tokens/tithe_tokens query in wallet(); promote _compute_distinctions import to module level
- gameboard/views.py: use apply_applet_toggle & rooms_for_user; fix double free_tokens query in toggle_game_applets
- billboard/views.py: use apply_applet_toggle & rooms_for_user
- SCSS: %tt-token-fields placeholder in _tooltips.scss; _gameboard & _game-kit @extend it
- epic/tests/unit/test_utils.py (new): coverage for _planet_house fallback path

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/apps/billboard/views.py

@@ -2,19 +2,15 @@ from django.contrib.auth.decorators import login_required
 from django.db.models import Max, Q
 from django.shortcuts import redirect, render
 
-from apps.applets.models import Applet, UserApplet
-from apps.applets.utils import applet_context
+from apps.applets.utils import applet_context, apply_applet_toggle
 from apps.drama.models import GameEvent, ScrollPosition
-from apps.epic.models import GateSlot, Room, RoomInvite
+from apps.epic.models import Room
+from apps.epic.utils import rooms_for_user
 
 
 @login_required(login_url="/")
 def billboard(request):
-    my_rooms = Room.objects.filter(
-        Q(owner=request.user) |
-        Q(gate_slots__gamer=request.user) |
-        Q(invites__invitee_email=request.user.email, invites__status=RoomInvite.PENDING)
-    ).distinct().order_by("-created_at")
+    my_rooms = rooms_for_user(request.user).order_by("-created_at")
 
     recent_room = (
         Room.objects.filter(
@@ -50,12 +46,7 @@ def billboard(request):
 @login_required(login_url="/")
 def toggle_billboard_applets(request):
     checked = request.POST.getlist("applets")
-    for applet in Applet.objects.filter(context="billboard"):
-        UserApplet.objects.update_or_create(
-            user=request.user,
-            applet=applet,
-            defaults={"visible": applet.slug in checked},
-        )
+    apply_applet_toggle(request.user, "billboard", checked)
     if request.headers.get("HX-Request"):
         return render(request, "apps/billboard/_partials/_applets.html", {
             "applets": applet_context(request.user, "billboard"),