fix: address code review findings for claim mapping rules editor

- Bump all font sizes from 11px/10px to 12px (project minimum)
- Fix handleMove race condition: use mutateAsync + Promise.all
- Clear stale test results after rule create/edit/delete/reorder
- Replace inline styles with CSS module classes in OidcConfigPage
- Remove dead .editRow CSS class
- Replace inline chevron with Lucide icon

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

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

@@ -44,3 +44,26 @@
 .roleInput {
   width: 200px;
 }
+
+.advancedRulesRow {
+  margin-top: 18px;
+  padding-top: 14px;
+  border-top: 1px solid var(--border);
+}
+
+.advancedRulesInner {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.advancedRulesLabel {
+  font-size: 13px;
+  color: var(--text-secondary, var(--text-muted));
+}
+
+.advancedRulesCount {
+  font-size: 12px;
+  color: var(--text-muted);
+  margin-left: 8px;
+}