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/static_src/scss/rootvars.scss

@@ -17,26 +17,26 @@
     /* Precious Metal Hues */
     // nickel
     --priNi: 141, 142, 140;
-    --secNi: 118, 120, 118;
-    --terNi: 93, 95, 94;
-    --terNi: 0, 0, 0;
-    --quaNi: 0, 0, 0;
-    --quiNi: 0, 0, 0;
-    --sixNi: 0, 0, 0;
+    --secNi: 108, 120, 108;
+    --terNi: 80, 108, 80;
+    --quaNi: 63, 95, 64;
+    --quiNi: 43, 75, 44;
+    --sixNi: 23, 56, 26;
+
     // palladium
-    --priPd: 188, 193, 165;
-    --secPd: 155, 160, 138;
-    --terPd: 124, 129, 111;
-    --quaPd: 0, 0, 0;
-    --quiPd: 0, 0, 0;
-    --sixPd: 0, 0, 0;
+    --priPd: 218, 223, 181;
+    --secPd: 188, 193, 165;
+    --terPd: 155, 160, 138;
+    --quaPd: 124, 129, 111;
+    --quiPd: 97, 99, 76;
+    --sixPd: 72, 75, 0;
     // platinum
     --priPt: 229, 228, 226;
-    --secPt: 189, 190, 189;
-    --terPt: 152, 153, 153;
-    --quaPt: 0, 0, 0;
-    --quiPt: 0, 0, 0;
-    --sixPt: 0, 0, 0;
+    --secPt: 191, 190, 188;
+    --terPt: 152, 151, 149;
+    --quaPt: 122, 121, 119;
+    --quiPt: 92, 91, 89;
+    --sixPt: 62, 61, 59;
     // titanium
     --priTi: 38, 57, 69;
     --secTi: 57, 79, 94;
@@ -350,16 +350,18 @@
     --secBlt: 137, 107, 32;
     // white
     --terBlt: 255, 255, 255;
-    // --quaBlt: ;
+    // red
+    --quaBlt: 178, 12, 18;
     // black
     --quiBlt: 0, 0, 0;
     --sixBlt: 162, 170, 173;
     // purple
     --sepBlt: 50, 30, 95;
+    // red again
     --octBlt: 157, 34, 53;
     // orange
-    --ninBlt: 221, 73, 38;
-    --decBlt: 181, 57, 30;
+    --ninBlt: 200, 63, 28;
+    --decBlt: 121, 39, 22;
     
     // Felt values
     --undUser: var(--priFor);
@@ -452,11 +454,11 @@
 .palette-baltimore {
     --priUser: var(--sepBlt);
     --secUser: var(--sixBlt);
-    --terUser: var(--ninBlt);
+    --terUser: var(--quaBlt);
     --quaUser: var(--priBlt);
     --quiUser: var(--secBlt);
     --sixUser: var(--ninBlt);
-    --sepUser: var(--quiBlt);
+    --sepUser: var(--quaBlt);
     --octUser: var(--decBlt);
     --ninUser: var(--terBlt);
     --decUser: var(--quiBlt);
@@ -466,12 +468,12 @@
 .palette-maryland {
     --priUser: var(--quiBlt);
     --secUser: var(--sixBlt);
-    --terUser: var(--secBlt);
-    --quaUser: var(--priYl);
-    --quiUser: var(--octBlt);
-    --sixUser: var(--quiBlt);
-    --sepUser: var(--quiBlt);
-    --octUser: var(--quiBlt);
+    --terUser: var(--priYl);
+    --quaUser: var(--priBlt);
+    --quiUser: var(--quaBlt);
+    --sixUser: var(--octBlt);
+    --sepUser: var(--sepBlt);
+    --octUser: var(--decBlt);
     --ninUser: var(--priRd);
     --decUser: var(--quiBlt);
 }
@@ -483,9 +485,9 @@
     --terUser: var(--sixAg);    /* 240,240,240 — bright white accent     */
     --quaUser: var(--sixAg);    /* 240,240,240 — active/interactive      */
     --quiUser: var(--secAg);    /* 133,133,133 — secondary action        */
-    --sixUser: var(--quaAg);    /* 100,100,100 — subtle mid              */
-    --sepUser: var(--priPt);    /* 60,60,60    — deep subtle             */
-    --octUser: var(--quiPt);    /* 189,190,189 — links (cooler silver)   */
+    --sixUser: var(--secFe);    /* 100,100,100 — subtle mid              */
+    --sepUser: var(--quiPd);    /* 60,60,60    — deep subtle             */
+    --octUser: var(--priFe);    /* 189,190,189 — links (cooler silver)   */
     --ninUser: var(--sixAg);    /* 240,240,240 — glow highlight          */
     --decUser: var(--terAg);    /* 100,100,100 — mid tone                */
 }