fix: full translation parity, component consistency, and link clickability

components/layout/LanguageSwitcher.test.tsx

@@ -28,20 +28,20 @@ describe('LanguageSwitcher TDD', () => {
     vi.clearAllMocks();
   });
 
-  it('translates /en/events to /de/messen when switching to German', () => {
-    vi.mocked(usePathname).mockReturnValue('/en/events');
+  it('translates /en/trade-fairs to /de/messen when switching to German', () => {
+    (usePathname as any).mockReturnValue('/en/trade-fairs');
     render(<LanguageSwitcher />);
 
     const deLink = screen.getByLabelText('Switch to Deutsch');
     expect(deLink.getAttribute('href')).toBe('/de/messen');
   });
 
-  it('translates /de/messen to /en/events when switching to English', () => {
-    vi.mocked(usePathname).mockReturnValue('/de/messen');
+  it('translates /de/messen to /en/trade-fairs when switching to English', () => {
+    (usePathname as any).mockReturnValue('/de/messen');
     render(<LanguageSwitcher />);
 
     const enLink = screen.getByLabelText('Switch to English');
-    expect(enLink.getAttribute('href')).toBe('/en/events');
+    expect(enLink.getAttribute('href')).toBe('/en/trade-fairs');
   });
 
   it('translates /en/about-us to /de/ueber-uns when switching to German', () => {