refactor: unify panel UI to gold design system, add backdrop blur to all overlays

src/components/SaveLoadMenu.vue

@@ -93,7 +93,9 @@ const maxSlots = 5
 .save-overlay {
   position: fixed;
   inset: 0;
-  background: rgba(0, 0, 0, 0.85);
+  background: rgba(0, 0, 0, 0.45);
+  backdrop-filter: blur(12px);
+  -webkit-backdrop-filter: blur(12px);
   display: flex;
   align-items: center;
   justify-content: center;
@@ -101,9 +103,9 @@ const maxSlots = 5
 }
 
 .save-panel {
-  background: #1a1a2e;
-  border: 1px solid rgba(255, 255, 255, 0.15);
-  border-radius: 8px;
+  background: rgba(12, 12, 18, 0.85);
+  border: none;
+  border-radius: 12px;
   padding: 32px;
   min-width: 480px;
   max-width: 560px;
@@ -115,7 +117,7 @@ const maxSlots = 5
   font-weight: 400;
   letter-spacing: 2px;
   margin-bottom: 24px;
-  color: #ddd;
+  color: #c9a84c;
 }
 
 .slot-list {
@@ -135,12 +137,12 @@ const maxSlots = 5
 }
 
 .auto-save-slot {
-  border-color: rgba(100, 200, 255, 0.3);
-  background: rgba(100, 200, 255, 0.06);
+  border-color: rgba(201, 168, 76, 0.3);
+  background: rgba(201, 168, 76, 0.06);
 }
 
 .auto-save-label {
-  color: #6cf;
+  color: #c9a84c;
 }
 
 .slot-thumb {