test(web): increase frontend test coverage to ~70% page coverage

- Fix vitest config to include [locale] directory tests (was excluded)
- Fix register.spec.tsx: use getByRole('heading') to avoid duplicate text match
- Fix search.spec.tsx: add QueryClientProvider wrapper and mock saved searches hook
- Add 12 new page test files covering dashboard, admin, public, and OAuth pages:
  - dashboard (main, profile, payments, subscription, KYC)
  - admin (dashboard, users)
  - public (landing, pricing)
  - analytics
  - OAuth callbacks (Google, Zalo)
- 29 test files, 174 tests, 16/23 pages covered (69.6%)

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/vitest.config.ts

@@ -6,7 +6,7 @@ export default defineConfig({
   plugins: [react()],
   test: {
     include: ['**/__tests__/**/*.spec.ts', '**/__tests__/**/*.test.ts', '**/__tests__/**/*.spec.tsx', '**/__tests__/**/*.test.tsx'],
-    exclude: ['**/node_modules/**', '**/\\[locale\\]/**'],
+    exclude: ['**/node_modules/**'],
     environment: 'jsdom',
     setupFiles: ['./vitest.setup.ts'],
     globals: true,