feat: refresh dashboard design with fantasy RPG aesthetic

- Replace Inter font with Cinzel (headings) + Jura (body)
- Deepen dark background palette with atmospheric gradient orbs
- Add subtle noise texture overlay for depth
- Refine glass cards with animated gradient border glow on hover
- Sharpen accent colors: violet #8b5cf6 + cyan #22d3ee
- Improve button tactile feedback and shadow system
- Add k8s manifests for minikube local deployment

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/GmRelay.Web/Components/Layout/MainLayout.razor.css

@@ -30,8 +30,9 @@
 
 /* === Error UI === */
 #blazor-error-ui {
-    background: var(--bg-secondary);
-    border-top: 1px solid var(--border-color);
+    background: var(--status-danger-bg);
+    color: var(--status-danger);
+    border-top: 1px solid rgba(239, 68, 68, 0.15);
     bottom: 0;
     box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.3);
     box-sizing: border-box;
@@ -41,8 +42,9 @@
     position: fixed;
     width: 100%;
     z-index: 1000;
-    color: var(--text-secondary);
     font-size: 0.875rem;
+    font-family: 'Jura', sans-serif;
+    font-weight: 500;
 }
 
     #blazor-error-ui .reload {