feat(engine): playability improvements — rounds 7–9 (#40–#64)

Round 7 — Input & feedback
- H key cycles hints; F1 opens help (conflict resolved)
- N key cancels active Time Attack session
- Hint text distinguishes "draw from stock" vs "recycle waste"
- Forfeit (G) clears AutoCompleteState so chime does not bleed into new deal
- Zen mode timer clears immediately on Z press
- HUD shows recycle count in both draw modes
- Settings scroll position persisted across open/close

Round 8 — Polish & clarity
- Undo unavailable fires "Nothing to undo" toast
- Streak-break toast on forfeit/abandon when streak > 1
- F11 fullscreen toggle with toast; documented in help and home screens
- H-after-win, new-game countdown expiry, Tab-no-cards toasts
- Win cascade duration/stagger scales with animation speed setting
- Draw-Three cycle counter HUD ("Cycle: N/3")
- Forfeit requires G×2 confirmation within 3 s (mirrors N key)

Round 9 — Game feel & information
- Escape dismisses game-over/stuck overlay (PausePlugin skips Escape when overlay visible)
- Shake animation on rejected drag before snap-back
- Forfeit countdown cancels when any other key is pressed (U/H/D/Z/Space)
- Tab wrap-around fires "Back to first card" toast
- HUD selection indicator shows active Tab-selected pile in yellow
- Challenge time-limit HUD turns orange < 60s, red < 30s
- Win summary shows XP breakdown (+50 base, +25 no-undo, +N speed)
- Game-over overlay: "No more moves available" with clear N/Escape/G instructions

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

solitaire_engine/src/resources.rs

@@ -53,3 +53,17 @@ pub enum SyncStatus {
 /// Bevy resource wrapping the current `SyncStatus`.
 #[derive(Resource, Debug, Clone, Default)]
 pub struct SyncStatusResource(pub SyncStatus);
+
+/// Tracks which hint the player is currently cycling through.
+///
+/// Incremented on each H press so repeated presses reveal different moves.
+/// Reset to `0` whenever the game state changes (move, draw, undo, new game).
+#[derive(Resource, Debug, Clone, Default)]
+pub struct HintCycleIndex(pub usize);
+
+/// Remembers the vertical scroll offset of the Settings panel between open/close cycles.
+///
+/// Saved when the panel is despawned and restored on next spawn so the player
+/// returns to the same position in the list without re-scrolling.
+#[derive(Resource, Debug, Clone, Default)]
+pub struct SettingsScrollPos(pub f32);