fix(frontend): narrow legacy cell alignment to Ref's markup

Ref never aligns `.tb_layout` cells from the table; each legacy cell opts in
with align=center. The directory title table, npc list and chief reservation
rows follow that, the nation info cells use Ref's gray rule, and the main
document stops clipping horizontally.

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

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

@@ -128,7 +128,7 @@ onMounted(async () => {
 }
 .legacy-table td,
 .legacy-table th {
-    border: 1px solid #777;
+    border: 1px solid gray;
     padding: 4px;
     font-weight: 400;
 }