New: HistoryStore — JSON-encoded SharedPreferences for two lists. Watches
keyed by videoId (max 50, FIFO), searches deduped case-insensitively (max
20). Surfaced as StateFlow so screens recompose live.
Wiring:
- StrawApp.onCreate: History.init(this)
- VideoDetailViewModel.load: recordWatch after StreamInfo resolves
- SearchViewModel.submit: recordSearch on each query
UI:
- StrawHome: redesigned. Tight inline header, full-width Search button,
"Recently watched" LazyColumn below. Tap a recent row → VideoDetail.
- SearchScreen: when query is blank, show recent searches as
AssistChip row. Tap a chip → onQueryChange + submit (instant search).
Day-4 graduates to Room when there's a real query pattern that SP can't
serve (date ranges, full-text search). For now the JSON-blob approach
ships in 30 minutes vs an hour of Room+KSP plumbing.
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