fix+refactor+docs: P0–P3 todo list items

P0 fixes:
- Register WinSummaryPlugin, SelectionPlugin, CardAnimationPlugin in main.rs
  (all three were exported but never wired — features silently did nothing)
- game_state::draw(): increment move_count on waste→stock recycle, not just
  on normal draws; add move_count_increments_on_recycle regression test

P1 fixes:
- solitaire_server/Cargo.toml: remove duplicate dev-dependencies
  (solitaire_sync, uuid, chrono, jsonwebtoken were in both sections)

P2 — input_plugin refactor:
- Split 198-line handle_keyboard() into three focused systems under 110 lines each:
  handle_keyboard_core (U/N/Z/D/Space), handle_keyboard_hint (H), handle_keyboard_forfeit (G)
- Introduce KeyboardConfirmState resource to share countdown timers across systems
- Add three new unit tests: all_hints_suggests_draw_*, all_hints_is_empty_when_truly_stuck,
  new_game_confirm_window_is_positive

P2 — achievement predicate tests (solitaire_core):
- Add 10 direct unit tests for speed_demon, lightning, no_undo, high_scorer,
  on_a_roll, comeback predicates (previously only covered via check_achievements())
- 141 core tests now passing

P2 — server tests:
- solitaire_server/src/sync.rs: 4 unit tests for merge logic (no DB required)
- solitaire_server/src/leaderboard.rs: 2 unit tests for entry shape and sort order

P3 — documentation:
- Add struct-level ///  to 12 Plugin structs (ChallengePlugin, CursorPlugin,
  AnimationPlugin, HelpPlugin, PausePlugin, AudioPlugin, DailyChallengePlugin,
  HudPlugin, LeaderboardPlugin, OnboardingPlugin, TimeAttackPlugin, WeeklyGoalsPlugin)
- Add field-level /// to Card, Pile, Deck, GameState, AchievementContext, AchievementDef
- Add /// to WeeklyGoalKind, WeeklyGoalDef, WeeklyGoalContext, StatsExt::update_on_win

card_animation module (new files from previous session):
- chain.rs, diagnostics.rs, tuning.rs, updated interaction.rs/animation.rs/mod.rs/lib.rs
- Remove unused HOVER_SCALE_DEFAULT / DRAG_LIFT_SCALE_DEFAULT / HOVER_LERP_SPEED_DEFAULT constants
- Add handle_touch_stock_tap so touch users can draw from the stock pile

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

solitaire_core/src/game_state.rs

@@ -64,18 +64,26 @@ struct StateSnapshot {
 /// Full state of an in-progress Klondike Solitaire game.
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct GameState {
+    /// All card piles keyed by pile type. Contains Stock, Waste, 4 Foundations, and 7 Tableau piles.
     #[serde(with = "pile_map_serde")]
     pub piles: HashMap<PileType, Pile>,
+    /// Whether the player draws one or three cards from the stock per turn.
     pub draw_mode: DrawMode,
     /// Top-level mode (Classic / Zen). Defaults to Classic for backwards
     /// compatibility with older save files via `#[serde(default)]`.
     #[serde(default)]
     pub mode: GameMode,
+    /// Current game score. Can be negative (undo penalties subtract from score).
     pub score: i32,
+    /// Total moves made this game, including draws and stock recycles.
     pub move_count: u32,
+    /// Seconds elapsed since the game started, used for time-bonus scoring.
     pub elapsed_seconds: u64,
+    /// RNG seed used to deal this game. Same seed always produces the same layout.
     pub seed: u64,
+    /// True once all 52 cards are on the foundations. No further moves are accepted.
     pub is_won: bool,
+    /// True when the game can be completed without further input (all remaining cards are face-up and in order).
     pub is_auto_completable: bool,
     /// Number of times `undo()` has been successfully invoked this game.
     /// Used by achievement conditions like `no_undo`.
@@ -173,6 +181,7 @@ impl GameState {
                 stock.cards.push(card);
             }
             self.recycle_count = self.recycle_count.saturating_add(1);
+            self.move_count += 1;
             return Ok(());
         }
 
@@ -562,6 +571,24 @@ mod tests {
         assert_eq!(g.recycle_count, 2);
     }
 
+    #[test]
+    fn move_count_increments_on_recycle() {
+        let mut g = new_game();
+        // Drain stock to waste, recording how many draws it took.
+        let mut draws: u32 = 0;
+        while !g.piles[&PileType::Stock].cards.is_empty() {
+            g.draw().unwrap();
+            draws += 1;
+        }
+        let before = g.move_count;
+        g.draw().unwrap(); // recycle
+        assert_eq!(
+            g.move_count,
+            before + 1,
+            "recycling waste back to stock must increment move_count (was {before}, draws={draws})"
+        );
+    }
+
     #[test]
     fn draw_from_empty_stock_and_waste_returns_error() {
         // The only stop condition for draw() is: both stock AND waste are