dubbodeck per-card FLIP back: the sig stage FLIPs each card to its OWN deck's back, not the seat's — finishes the cross-deck story — TDD

Pairs with the dubbodeck assembly: a mixed pile can now hold cards from up to three decks per polarity, so the single server-rendered back (the viewer's seat deck) was wrong for any cross-deck card. Now per-card: each .sig-card thumbnail carries data-back-image-url (its OWN deck back, only for non-polarized image decks; empty otherwise); stage-card.js fromDataset reads back_image_url + _setImageMode repoints the stage .sig-stage-card-back-img at the FOCUSED card's back and shows/hides the FLIP affordance per card (a backless card in the pile hides FLIP + drops any flipped state).

- _sig_select_overlay.html: the stage back-img + FLIP now render on sig_pile_has_backs (ANY pile card is a non-polarized image deck) instead of the viewer's-seat-deck gate, so an RWS grails/blades card in a PC-earthman viewer's pile can FLIP. Initial src dropped (JS sets it on first focus). epic/views.py computes the flag where sig_cards is set; _court_cards/_major_cards gained select_related(deck_variant) to keep the per-card deck access N+1-free.

TDD: 3 ITs in SigSelectUnifiedStageTest (non-polarized image deck -> per-card /static back url + sig_pile_has_backs + stage back-img/FLIP rendered; polarized deck -> empty back + no FLIP element; text-only deck -> empty back). 562 epic view+model ITs green. The JS repoint/hide is the stage-Jasmine debt (deferred) — manually verified.

- bundled (parallel work): rootvars.scss ongoing palette tuning.

[[project-deck-segment-model]] [[project-image-based-deck-face-rendering]]

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/apps/epic/models.py

@@ -817,7 +817,7 @@ def _court_cards(deck_variant, suits):
         arcana__in=[TarotCard.MIDDLE, TarotCard.MINOR],
         suit__in=suits,
         number__in=[11, 12, 13, 14],
-    ))
+    ).select_related("deck_variant"))
 
 
 def _major_cards(deck_variant):
@@ -826,7 +826,7 @@ def _major_cards(deck_variant):
         return []
     return list(TarotCard.objects.filter(
         deck_variant=deck_variant, arcana=TarotCard.MAJOR, number__in=[0, 1],
-    ))
+    ).select_related("deck_variant"))
 
 
 def _polarity_sig_cards(room, polarity):