feat(search): open zayit:// deep links pasted into the search bar

[kdroidFilter]

Summary

• Pasting a zayit://book/<id>/line/<lineId> (or zayit://search/...) link into the main search bar now opens the target directly instead of running a text search.
• submitSearch parses the query with parseZayitDeepLink; on a match it validates the book exists (getBookCore) and emits a new NavigateToDeepLink event.
• TabsContent handles the event by replacing the current tab's destination, reusing the existing deep-link parsing already used for external links.

Test plan

• Paste zayit://book/247/line/169673 → opens the book at the line
• Paste zayit://search/... → opens the search
• A normal text query still runs a search
• A link to a non-existent book falls back to a normal search