Surface live YouTube search in the existing feed, triggered explicitly so the
expensive API call is never per-keystroke.
- Header: the search box still filters the local catalog as you type; Enter or a
YouTube button escalates the term to a live search (hidden for the demo account).
- Feed: a dedicated infinite query renders results in the same VirtualFeed cards +
in-app player, under a banner with a back button and a quota note. No auto-paginate
(each page spends 100 units) — an explicit 'Load more (uses quota)' button instead;
quota/limit errors (incl. 429) shown inline. The empty local feed offers a
'Search YouTube for <q>' CTA.
- Library: a 'Search-discovered' toggle reveals search-ingested videos (hidden by
default); sent as exclude_search_discovered.
- Admin: search_daily_limit_per_user config field; new videos_search quota label.
- All new strings translated in HU/EN/DE.
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