Tests failed because PageTabs uses Link from @modern-js/runtime/router
which wasn't included in the router mock. Added Link to the router mock,
added mocks for PageTabs, OnlineBoardFilter, and other transitive deps,
and updated error text assertions to match the new Russian strings.
Rewrite OnlineBoardStartPage to use PageLayout two-column structure,
add OnlineBoardFilter with PrimeNG-style accordion tabs, and render
the info tiles and popular requests section matching the Angular
template. Update tests for the new component structure.
Registers schedule URL serializer in parity harness with 18-entry fixture
corpus and fast-check fuzz. 10 URL round-trip integration tests, 6 SEO/
JSON-LD integration tests. Updates barrel and MF expose from stub to real.
6 test files covering start page, flight search, flight details,
URL round-tripping, error handling, and SEO output verification.
All tests use mocked API and SignalR layers with jsdom environment.
gnezim