Press L to open a leaderboard overlay. On open, an async fetch is
dispatched against the active SyncProvider. Results cache in
LeaderboardResource; the panel rebuilds live when data arrives.
Closing during a fetch is safe (ClosedThisFrame flag prevents
re-spawning the panel in the same frame as the user's despawn command).
Format: ranked table with player name, best score, and fastest win time.
Non-authenticated / LocalOnly providers return an empty list gracefully.
- solitaire_data: add fetch_leaderboard() to SyncProvider trait
(default → Ok([])) and implement in SolitaireServerClient
- solitaire_engine: new LeaderboardPlugin with 5 unit tests
- solitaire_app: register LeaderboardPlugin
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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