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/LayoutShell.tsx

@@ -245,7 +245,7 @@ function StarredList({ items, onNavigate, onRemove }: { items: StarredItem[]; on
           {item.icon && <span style={{ display: 'flex', alignItems: 'center', color: 'var(--sidebar-muted)' }}>{item.icon}</span>}
           <span style={{ flex: 1, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>
             {item.label}
-            {item.parentApp && <span style={{ color: 'var(--sidebar-muted)', marginLeft: 4, fontSize: 10 }}>{item.parentApp}</span>}
+            {item.parentApp && <span style={{ color: 'var(--sidebar-muted)', marginLeft: 4, fontSize: 12 }}>{item.parentApp}</span>}
           </span>
           <button
             style={{ background: 'none', border: 'none', padding: 2, cursor: 'pointer', color: 'var(--sidebar-muted)', display: 'flex', alignItems: 'center', opacity: 0.6 }}