chore: update DS to v0.1.38, enforce 12px font size floor

Update @cameleer/design-system to v0.1.38 (12px minimum font size).
Replace all 10px and 11px font sizes with 12px across 25 CSS modules
and 5 TSX inline styles to match the new DS floor.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/Admin/AppConfigDetailPage.module.css

@@ -99,7 +99,7 @@
 }
 
 .meta {
-  font-size: 11px;
+  font-size: 12px;
   color: var(--text-muted);
 }
 
@@ -177,7 +177,7 @@
 }
 
 .hint {
-  font-size: 11px;
+  font-size: 12px;
   color: var(--text-muted);
   font-family: var(--font-body);
 }