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/components/ProcessDiagram/ProcessDiagram.module.css

@@ -73,7 +73,7 @@
 }
 
 .zoomLevel {
-  font-size: 11px;
+  font-size: 12px;
   color: var(--text-muted, #9C9184);
   min-width: 36px;
   text-align: center;
@@ -182,7 +182,7 @@
   background: rgba(255, 255, 255, 0.15);
   border-radius: 3px;
   padding: 1px 3px;
-  font-size: 10px;
+  font-size: 12px;
   color: white;
   font-family: inherit;
 }
@@ -195,7 +195,7 @@
   color: white;
   border-radius: 2px;
   cursor: pointer;
-  font-size: 10px;
+  font-size: 12px;
   display: flex;
   align-items: center;
   justify-content: center;