store: SBA Scout Rust Phase 4: Async TUI with Dashboard and Gameday screens

graph/decisions/sba-scout-rust-phase-4-async-tui-with-dashboard-and-gameday-bc4abc.md

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+---
+id: bc4abc6e-57c1-4d6c-b414-213c1367be9b
+type: decision
+title: "SBA Scout Rust Phase 4: Async TUI with Dashboard and Gameday screens"
+tags: [sba-scout, rust, tui, ratatui, phase-4, async, tokio, decision]
+importance: 0.8
+confidence: 0.8
+created: "2026-02-28T16:52:43.969652+00:00"
+updated: "2026-02-28T16:52:43.969652+00:00"
+---
+
+# SBA Scout Rust Phase 4 Complete
+
+**Branch:** `feat/rust-rewrite` | **Commit:** `6d2b11a`
+
+## What Was Implemented
+
+Phase 4 replaced blocking `event::read()` with `tokio::select!` over `EventStream` + mpsc channel + tick interval, enabling a fully async TUI.
+
+## Architecture
+
+- **AppMessage enum** — typed channel messages for background task results
+- **ActiveScreen enum** — owns screen-specific state (`DashboardState`, `GamedayState`)
+- **SelectorWidget<T>** — generic popup list widget for cascading selectors
+- **Notification system** — UI notifications with auto-expiry
+
+## Screens
+
+### Dashboard
+- Roster summary cards
+- API sync trigger
+
+### Gameday
+- Cascading team/pitcher selectors
+- Matchup analysis table
+- 9-slot lineup management with save/load
+
+## Navigation
+- `d` = Dashboard, `g` = Gameday, `q` = quit (disabled during text input)
+
+## Stats
+- 1739 lines added across 10 files
+- 105 tests passing