sig-select sprint: SigReservation model + sig_reserve view (OK/NVM hold); full sig-select.js rewrite with stage preview, WS hover cursors, reservation lock (must NVM before OK-ing another card — enforced server-side 409 + JS guard); sizeSigModal() + sizeSigCard() in room.js (JS-based card sizing avoids libsass cqw/cqh limitation); stat block hidden until OK pressed; mobile touch: dismiss stage on outside-grid tap when unfocused; 17 IT + Jasmine specs

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

src/apps/epic/urls.py

@@ -16,6 +16,7 @@ urlpatterns = [
     path('room/<uuid:room_id>/pick-sigs', views.pick_sigs, name='pick_sigs'),
     path('room/<uuid:room_id>/select-role', views.select_role, name='select_role'),
     path('room/<uuid:room_id>/select-sig', views.select_sig, name='select_sig'),
+    path('room/<uuid:room_id>/sig-reserve', views.sig_reserve, name='sig_reserve'),
     path('room/<uuid:room_id>/gate/invite', views.invite_gamer, name='invite_gamer'),
     path('room/<uuid:room_id>/gate/status', views.gate_status, name='gate_status'),
     path('room/<uuid:room_id>/delete', views.delete_room, name='delete_room'),