Flatten panel gradients to subtle purple, themed 404, gold links

- Replace the velvet/ledger diagonal plum gradients with one flat
  purple per surface (anchored to the group-card tone rgb(24,20,29));
  topbar now uses the same flat tone so it meshes with the panels
- Add a Westgate-themed 404 page (Night Masks warning, fa-mask icon),
  vertically centered in the content area; strings in westgate.json
- Set Bootstrap link CSS vars globally so utility-classed links
  (alert-link, link-*) get the wiki gold like plain anchors

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scss/westgate/_controls.scss

@@ -397,7 +397,7 @@ table[component="notification/table"] a[data-type]:focus {
       transparent calc(100% - 1px),
       rgba(194, 163, 90, 0.055) calc(100% - 1px)
     ),
-    linear-gradient(100deg, rgba(32, 19, 30, 0.98), rgba(13, 12, 17, 0.98)) !important;
+    var(--wg-velvet-panel) !important;
   background-size:
     100% var(--wg-ledger-line),
     auto;

scss/westgate/_responsive.scss

@@ -1,6 +1,6 @@
 @include media-breakpoint-down(lg) {
 	#panel {
-		background: linear-gradient(180deg, rgba(18, 15, 22, 0.96), rgba(9, 8, 11, 1));
+		background: rgba(17, 14, 21, 0.98);
 	}
 
 	ul.categories-list,

scss/westgate/_surfaces.scss

@@ -5,6 +5,10 @@ body {
 }
 
 body {
+  --bs-link-color: var(--wg-gold);
+  --bs-link-color-rgb: 194, 163, 90;
+  --bs-link-hover-color: #e0c878;
+  --bs-link-hover-color-rgb: 224, 200, 120;
   font-family: var(--wg-font-text);
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
@@ -14,6 +18,12 @@ body {
   background: var(--wg-bg);
 }
 
+// h-100 on #content collapses inside the flex-grown #panel, so the 404's
+// flex-fill never gets height to center in; let #content grow instead
+body.template-404 #content {
+  flex-grow: 1;
+}
+
 .layout-container,
 #content {
   color: var(--wg-text-soft);

scss/westgate/_tokens.scss

@@ -105,12 +105,7 @@
 	--wg-border-soft: rgba(194, 163, 90, 0.08);
 	--wg-focus: rgba(194, 163, 90, 0.28);
 	--wg-focus-ring: #c2a35a;
-	--wg-ledger-panel: linear-gradient(
-		100deg,
-		rgba(38, 22, 35, 0.5) 0%,
-		rgba(19, 17, 24, 0.97) 34%,
-		rgba(13, 12, 17, 0.98) 100%
-	);
+	--wg-ledger-panel: rgba(21, 17, 26, 0.97);
 	--wg-ledger-ruling: rgba(194, 163, 90, 0.055);
 	--wg-ledger-rule-strong: rgba(194, 163, 90, 0.16);
 	--wg-ledger-border: rgba(194, 163, 90, 0.18);
@@ -120,20 +115,8 @@
 		--wg-ledger-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.024), inset 0 -1px 0 rgba(0, 0, 0, 0.42), 0 8px 18px rgba(0, 0, 0, 0.2);
 		--wg-etched-highlight: rgba(246, 223, 163, 0.34);
 		--wg-etched-shadow: rgba(23, 12, 16, 0.82);
-		--wg-velvet-panel: linear-gradient(
-		100deg,
-		rgba(42, 18, 34, 0.46) 0%,
-		rgba(25, 22, 31, 0.95) 23%,
-		rgba(18, 16, 23, 0.99) 62%,
-		rgba(13, 12, 17, 0.98) 100%
-	);
-	--wg-velvet-panel-hover: linear-gradient(
-		100deg,
-		rgba(58, 24, 48, 0.56) 0%,
-		rgba(31, 25, 39, 0.98) 23%,
-		rgba(21, 18, 27, 1) 62%,
-		rgba(15, 14, 20, 0.99) 100%
-	);
+	--wg-velvet-panel: rgba(24, 20, 29, 0.97);
+	--wg-velvet-panel-hover: rgba(31, 26, 38, 0.98);
 	--wg-velvet-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.025), inset 0 0 34px rgba(96, 32, 68, 0.11), 0 10px 26px rgba(0, 0, 0, 0.24);
 	--wg-control-bg: linear-gradient(to bottom, rgba(194, 163, 90, 0.15), rgba(194, 163, 90, 0.05));
 }

scss/westgate/_topbar.scss

@@ -1,10 +1,4 @@
-$wg-topbar-panel-bg: linear-gradient(
-  100deg,
-  #2a1222 0%,
-  #19161f 23%,
-  #121017 62%,
-  #0d0c11 100%
-);
+$wg-topbar-panel-bg: rgba(21, 17, 26, 0.98);
 
 .wg-layout-container {
   min-height: 100vh;
@@ -14,9 +8,7 @@ $wg-topbar-panel-bg: linear-gradient(
   top: 0;
   z-index: 1020;
   color: var(--wg-text-soft);
-  background:
-    linear-gradient(180deg, rgba(255, 241, 196, 0.035), transparent 42%),
-    linear-gradient(90deg, rgba(42, 18, 34, 0.96), rgba(15, 13, 18, 0.98) 38%, rgba(9, 8, 11, 0.99));
+  background: rgba(24, 20, 29, 0.98);
   border-bottom: 1px solid rgba(194, 163, 90, 0.2);
   box-shadow:
     inset 0 1px 0 rgba(255, 244, 221, 0.04),

scss/westgate/_widgets.scss

@@ -54,7 +54,7 @@
 	padding: var(--wg-space-md);
 	background:
 		linear-gradient(to bottom, transparent calc(100% - 1px), rgba(194, 163, 90, 0.045) calc(100% - 1px)),
-		linear-gradient(100deg, rgba(42, 18, 34, 0.34), rgba(18, 16, 23, 0.96) 62%, rgba(13, 12, 17, 0.98)) !important;
+		var(--wg-velvet-panel) !important;
 	background-size: 100% var(--wg-ledger-line), auto;
 	border: 1px solid rgba(194, 163, 90, 0.14);
 	border-radius: 8px;