fix: stabilize useMemo deps and add category search to sidebar

- Use activeSection instead of activeTreeInfo as useMemo dependency
  (activeTreeInfo is derived from activeSection, new object each render)
- Add category label matching to sidebar autocomplete search filter
  to match global search behavior

src/components/admin/SettingsTreeSidebar.tsx

@@ -56,6 +56,8 @@ export function SettingsTreeSidebar({
             const translatedName = t(`admin.settings.settingNames.${formattedKey}`, formattedKey);
             if (translatedName.toLowerCase().includes(q)) return true;
             if (s.hint?.description?.toLowerCase().includes(q)) return true;
+            const categoryLabel = t(`admin.settings.categories.${s.category.key}`, s.category.key);
+            if (categoryLabel.toLowerCase().includes(q)) return true;
             return false;
           })
           .slice(0, 8)

src/pages/AdminSettings.tsx

@@ -106,7 +106,8 @@ export default function AdminSettings() {
       label: t(`admin.settings.categories.${key}`, key),
       settings,
     }));
-  }, [activeTreeInfo, allSettings, t]);
+    // eslint-disable-next-line react-hooks/exhaustive-deps -- activeTreeInfo derived from activeSection
+  }, [activeSection, allSettings, t]);
 
   // Filter settings for search - GLOBAL search across all settings
   const filteredSettings = useMemo(() => {
@@ -168,7 +169,8 @@ export default function AdminSettings() {
     if (activeTreeInfo) return t(`admin.settings.tree.${activeTreeInfo.child.id}`);
 
     return t('admin.settings.title');
-  }, [activeSection, activeTreeInfo, t]);
+    // eslint-disable-next-line react-hooks/exhaustive-deps -- activeTreeInfo derived from activeSection
+  }, [activeSection, t]);
 
   // Render content based on active section
   const renderContent = () => {