Lifetime stats now also track best score and fastest win per game
mode (Classic, Zen, Challenge), additive on top of the existing
all-modes-combined `best_single_score` and `fastest_win_seconds`.
Time Attack is intentionally excluded — its scoring model is
session-level (count of wins inside a 10-minute window) so a
per-game best wouldn't compose. Daily Challenge inherits Classic
scoring and contributes through the Classic row.
- `solitaire_sync::StatsSnapshot` gains six fields (`{mode}_best_score`,
`{mode}_fastest_win_seconds` × {Classic, Zen, Challenge}). All are
`#[serde(default)]` so older save files load cleanly to zeros.
- `solitaire_sync::merge` propagates the per-mode bests through the
same max/min logic as the global counterparts.
- `solitaire_data::StatsExt::update_per_mode_bests` is the engine's
entry point — called from `update_stats_on_win` alongside the
existing `update_on_win`.
- Stats overlay grows a "Per-mode bests" section with three rows
(Classic / Zen / Challenge) tagged with `PerModeBestsRow`. Empty
rows render an em-dash, matching the first-launch zero-state
treatment used by the primary cells.
- 3 new tests cover the rendering, the Classic-mode update path,
and the Zen-mode update path.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
funman300
3984231c9b