Promotes the Stats overlay's Watch Replay button from a stub
InfoToastEvent ("playback coming in a future build") to actually
starting in-engine playback via the new
replay_playback::start_replay_playback API. Pressing the button
when a replay exists resets the game to the recorded deal and the
ReplayOverlayPlugin's banner takes over.
The handler reads ReplayPlaybackState via Option<ResMut<...>> so
headless test fixtures that don't register ReplayPlaybackPlugin
keep compiling — they fall back to a descriptive "Replay ready"
toast. The "no replay yet" branch still surfaces the existing
"win a game first" toast.
Plugin registration in solitaire_app/src/main.rs picks up
ReplayPlaybackPlugin and ReplayOverlayPlugin alongside the existing
StatsPlugin. They run in any order — the playback plugin owns the
state resource, the overlay plugin spawns/despawns based on state
changes, and Stats's button handler dispatches into the playback
plugin's API.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
funman300
02ababa65f