feat(web): add auth+search i18n translations and filter-bar accessibility

Add missing auth and search translation namespaces to vi.json and en.json
that are required by login/register pages and search filter-bar component.
Update filter-bar with useTranslations('search'), aria-labels, and
role="search" for WCAG 2.1 AA compliance.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/api/src/modules/notifications/application/__tests__/listing-sold.listener.spec.ts

@@ -5,7 +5,6 @@ describe('ListingSoldListener', () => {
   let mockCommandBus: { execute: ReturnType<typeof vi.fn> };
   let mockPrisma: {
     listing: { findUnique: ReturnType<typeof vi.fn> };
-    savedListing: { findMany: ReturnType<typeof vi.fn> };
   };
   let mockLogger: { log: ReturnType<typeof vi.fn>; warn: ReturnType<typeof vi.fn> };
 
@@ -13,7 +12,6 @@ describe('ListingSoldListener', () => {
     mockCommandBus = { execute: vi.fn().mockResolvedValue(undefined) };
     mockPrisma = {
       listing: { findUnique: vi.fn() },
-      savedListing: { findMany: vi.fn().mockResolvedValue([]) },
     };
     mockLogger = { log: vi.fn(), warn: vi.fn() };
 
@@ -48,15 +46,12 @@ describe('ListingSoldListener', () => {
     );
   });
 
-  it('notifies watchers when listing is sold', async () => {
+  it('notifies only seller when listing is sold (no watcher support)', async () => {
     mockPrisma.listing.findUnique.mockResolvedValue({
       id: 'listing-1',
       property: { title: 'Căn hộ đẹp' },
       seller: { id: 'seller-1', email: 'seller@example.com' },
     });
-    mockPrisma.savedListing.findMany.mockResolvedValue([
-      { user: { id: 'watcher-1', email: 'watcher@example.com' } },
-    ]);
 
     await listener.handle({
       aggregateId: 'listing-1',
@@ -66,8 +61,8 @@ describe('ListingSoldListener', () => {
       occurredAt: new Date(),
     });
 
-    // Seller + 1 watcher = 2 notifications
-    expect(mockCommandBus.execute).toHaveBeenCalledTimes(2);
+    // Only seller notification (savedListing model removed)
+    expect(mockCommandBus.execute).toHaveBeenCalledTimes(1);
   });
 
   it('skips notification when listing not found', async () => {