Fix admin reference mode regressions

frontend/src/components/admin/ThemeCustomizerEnhanced.tsx

@@ -14,6 +14,8 @@ interface ThemeCustomizerEnhancedProps {
   isPreviewMode?: boolean;
   showGalleryLayouts?: boolean;
   hideActions?: boolean;
+  onApply?: (theme: ThemeConfig, metadata: { presetName: string }) => Promise<void> | void;
+  isApplying?: boolean;
 }
 
 const layoutIcons: Record<GalleryLayoutType, React.ReactNode> = {
@@ -34,7 +36,9 @@ export const ThemeCustomizerEnhanced: React.FC<ThemeCustomizerEnhancedProps> = (
   onPresetChange,
   isPreviewMode = false,
   showGalleryLayouts = true,
-  hideActions = false
+  hideActions = false,
+  onApply,
+  isApplying = false
 }) => {
   const { t } = useTranslation();
   const [localTheme, setLocalTheme] = useState<ThemeConfig>(value);
@@ -80,8 +84,13 @@ export const ThemeCustomizerEnhanced: React.FC<ThemeCustomizerEnhancedProps> = (
     }
   };
 
-  const handleApply = () => {
-    onChange({ ...localTheme, customCss });
+  const handleApply = async () => {
+    const themeWithCss = { ...localTheme, customCss };
+    onChange(themeWithCss);
+
+    if (onApply) {
+      await onApply(themeWithCss, { presetName: selectedPreset });
+    }
   };
 
   const handleReset = () => {
@@ -587,11 +596,12 @@ export const ThemeCustomizerEnhanced: React.FC<ThemeCustomizerEnhancedProps> = (
             variant="primary"
             leftIcon={<Palette className="w-4 h-4" />}
             onClick={handleApply}
+            disabled={isApplying}
           >
-            {t('branding.applyTheme')}
+            {isApplying ? t('common.applying', 'Applying...') : t('branding.applyTheme')}
           </Button>
         </div>
       )}
     </div>
   );
-};
+};

frontend/src/components/admin/__tests__/ThemeCustomizerEnhanced.test.tsx

@@ -0,0 +1,70 @@
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { vi } from 'vitest';
+
+import { ThemeCustomizerEnhanced } from '../ThemeCustomizerEnhanced';
+import type { ThemeConfig } from '../../../types/theme.types';
+
+vi.mock('react-i18next', async () => {
+  const actual = await vi.importActual<typeof import('react-i18next')>('react-i18next');
+  return {
+    ...actual,
+    useTranslation: () => ({
+      t: (_key: string, fallback?: string) => fallback ?? _key
+    })
+  };
+});
+
+describe('ThemeCustomizerEnhanced', () => {
+  const baseTheme: ThemeConfig = {
+    primaryColor: '#000000',
+    accentColor: '#ffffff',
+    backgroundColor: '#eeeeee',
+    textColor: '#111111',
+    galleryLayout: 'grid',
+    gallerySettings: {
+      spacing: 'normal'
+    }
+  };
+
+  it('invokes onApply when Apply Theme is clicked', async () => {
+    const user = userEvent.setup();
+    const handleChange = vi.fn();
+    const handleApply = vi.fn().mockResolvedValue(undefined);
+
+    render(
+      <ThemeCustomizerEnhanced
+        value={baseTheme}
+        onChange={handleChange}
+        presetName="default"
+        onApply={handleApply}
+      />
+    );
+
+    const applyButton = screen.getByRole('button', { name: /branding\.applyTheme/i });
+    await user.click(applyButton);
+
+    expect(handleChange).toHaveBeenCalled();
+    expect(handleApply).toHaveBeenCalledTimes(1);
+    expect(handleApply).toHaveBeenCalledWith(
+      expect.objectContaining({ primaryColor: '#000000' }),
+      expect.objectContaining({ presetName: 'default' })
+    );
+  });
+
+  it('disables the Apply button while applying', () => {
+    const handleChange = vi.fn();
+
+    render(
+      <ThemeCustomizerEnhanced
+        value={baseTheme}
+        onChange={handleChange}
+        presetName="default"
+        isApplying={true}
+      />
+    );
+
+    const applyButton = screen.getByRole('button', { name: /applying/i });
+    expect(applyButton).toBeDisabled();
+  });
+});