Native InnerTube video search, search redesign, and a shared adaptive grid

[A-EDev]

Summary

Moves video search off NewPipeExtractor onto the native InnerTube client — 13 requests per page down to 1 — and rebuilds the search surface on Material 3 with a grid layout shared with Home and Channels.

Data and parsing

• innertube/pages/channel/ promoted to innertube/pages/renderer/, since search and channel parse the same renderers. ChannelItem → FeedItem, ChannelSection → FeedShelf, and so on.
• New innertube/pages/search/: SearchResultsPage, SearchPageParser, SearchSuggestionsPage. Structural JSON parsing against a renderer registry, not typed DTOs.
• YouTubeSearchParams generalised into a protobuf params builder, so every filter and sort is applied server-side rather than by fetching more and filtering locally.
• SearchPagingSource folds the creator's "Latest from" strip into the channel card it belongs to, dedupes across pages, and drops blocked creators.

Filters that are dead server-side are not offered: sort-by-date and sort-by-rating return the same result set as relevance (verified by diffing live responses), so only Relevance and View count ship.

UI

• SearchScreen 1790 → 242 lines; components split into ui/components/search/.
• M3 search bar with a back arrow, filters in a dialog, a grid/list toggle, Shorts and community post shelves in the results.
• Creator card is tinted from the channel avatar via the existing rememberMediaArtworkTint, with the latest-uploads shelf attached to it and a responsive action row.
• FeedGridLayout gains cardWidth; rows the grid cannot fill now take a full-width thumbnail-left card each, sized to one grid column so they line up with the cards above. List mode is one full-width column at every size.

Shared components gained parameters whose defaults preserve existing behaviour, so no other call site changes visually: CompactVideoCard(thumbnailWidth), FlowSubscribeButton(size, tint), MediaArtworkTint.raised.

Also

• Blocked channels are now hidden from search results, reusing FlowNeuroEngine's blocked set.
• Fixes ViewHistory.touchHistoryEntry overwriting a recorded duration with 0, which silently dropped a video from the watch-progress map.

Testing

129 tests across 15 classes, including 17 real captured InnerTube responses as fixtures.

./gradlew spotlessCheck
./gradlew :app:compileGithubDebugKotlin :app:compileFossDebugKotlin
./gradlew :app:testGithubDebugUnitTest :app:assembleGithubDebug

All green. Verified on a phone in portrait and landscape; not verified on tablet hardware.

Layout is covered as pure logic rather than by rendering: VideoCardFullWidth and CompactVideoCard call hiltViewModel() unconditionally and there is no Hilt test infrastructure in src/test, so rendering a video card there throws.

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