fix(frontend): stop clipping pages Ref leaves visible

The auction, my page, nation betting and hall of fame roots clipped content that
Ref lets overflow, which shifted their measured document size. The dashboard
reload controls and the diplomacy table frame now follow Ref's Lumen navigation
family and its non-collapsed gray/black frame.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

app/game-frontend/src/views/DiplomacyView.vue

@@ -648,10 +648,19 @@ onBeforeUnmount(() => {
     line-height: 1.3;
 }
 
+/*
+ * Ref's diplomacy tables are not collapsed and carry an outset-style frame:
+ * gray on the top and left edges, black on the right and bottom.
+ */
 .legacy-layout-table {
     width: 1000px;
     margin: 0 auto;
-    border-collapse: collapse;
+    border-collapse: separate;
+    border-spacing: 0;
+    border-top: 1px solid gray;
+    border-left: 1px solid gray;
+    border-right: 1px solid #000;
+    border-bottom: 1px solid #000;
     background-color: transparent;
 }