chore(workspace): fix all clippy warnings in test code

Resolves 15 violations found by `cargo clippy --workspace --tests -D warnings`:
- Remove unused imports (Card, Rank) in cursor_plugin tests
- Replace absurd i32::MAX comparison with a meaningful >= 0 check
- Use range .contains() instead of manual >= && <= (manual_range_contains)
- Move impl FromRequestParts before test module in middleware.rs (items_after_test_module)
- Move _VEC3_REFERENCED const before test module in input_plugin.rs
- Convert runtime assert on constant to const { assert!(...) }
- Use .contains() instead of .iter().any() for slice membership
- Replace .get(...).is_none() with !.contains_key(...) in HashMap checks
- Collapse Default::default() + field assignment into struct literal initializers
  across solitaire_sync, solitaire_data, and solitaire_engine test helpers

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

solitaire_engine/src/animation_plugin.rs

@@ -775,8 +775,7 @@ mod tests {
         let mut app = App::new();
         app.add_plugins(MinimalPlugins).add_plugins(AnimationPlugin);
 
-        let mut fast_settings = Settings::default();
-        fast_settings.animation_speed = AnimSpeed::Fast;
+        let fast_settings = Settings { animation_speed: AnimSpeed::Fast, ..Default::default() };
         app.world_mut().send_event(SettingsChangedEvent(fast_settings));
         app.update();
 

solitaire_engine/src/cursor_plugin.rs

@@ -214,7 +214,6 @@ fn point_in_rect(point: Vec2, center: Vec2, size: Vec2) -> bool {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use solitaire_core::card::{Card, Rank};
 
     #[test]
     fn point_in_rect_center_is_inside() {

solitaire_engine/src/input_plugin.rs

@@ -988,6 +988,11 @@ pub fn find_hint(game: &GameState) -> Option<(PileType, PileType, usize)> {
     all_hints(game).into_iter().next()
 }
 
+// `Vec3` is referenced only via the `DRAG_Z` constant; keep the import silenced
+// when the compiler can't see it used.
+#[allow(dead_code)]
+const _VEC3_REFERENCED: Option<Vec3> = None;
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -1428,7 +1433,7 @@ mod tests {
     /// window actually opens on the first G press.
     #[test]
     fn forfeit_confirm_window_is_positive() {
-        assert!(FORFEIT_CONFIRM_WINDOW > 0.0, "FORFEIT_CONFIRM_WINDOW must be > 0");
+        const { assert!(FORFEIT_CONFIRM_WINDOW > 0.0, "FORFEIT_CONFIRM_WINDOW must be > 0"); }
     }
 
     /// Simulate the first G press: countdown was 0, so it should become
@@ -1616,7 +1621,3 @@ mod tests {
     }
 }
 
-// `Vec3` is referenced only via the `DRAG_Z` constant; keep the import silenced
-// when the compiler can't see it used.
-#[allow(dead_code)]
-const _VEC3_REFERENCED: Option<Vec3> = None;

solitaire_engine/src/stats_plugin.rs

@@ -792,7 +792,7 @@ mod tests {
             .collect();
 
         assert!(
-            messages.iter().any(|m| *m == "Streak of 3 broken!"),
+            messages.contains(&"Streak of 3 broken!"),
             "expected 'Streak of 3 broken!' in toasts, got: {messages:?}"
         );
     }

solitaire_engine/src/sync_plugin.rs

@@ -403,8 +403,7 @@ mod tests {
 
     #[test]
     fn build_payload_clones_stats() {
-        let mut stats = StatsSnapshot::default();
-        stats.games_played = 42;
+        let stats = StatsSnapshot { games_played: 42, ..Default::default() };
         let payload = build_payload(&stats, &[], &PlayerProgress::default());
         assert_eq!(payload.stats.games_played, 42);
     }

solitaire_engine/src/weekly_goals_plugin.rs

@@ -158,7 +158,7 @@ mod tests {
         assert_eq!(p.weekly_goal_progress.get("weekly_5_wins"), Some(&1));
         // No-undo + slow win → no_undo goal also ticked, fast goal NOT ticked.
         assert_eq!(p.weekly_goal_progress.get("weekly_3_no_undo"), Some(&1));
-        assert!(p.weekly_goal_progress.get("weekly_3_fast").is_none());
+        assert!(!p.weekly_goal_progress.contains_key("weekly_3_fast"));
     }
 
     #[test]
@@ -188,7 +188,7 @@ mod tests {
         app.update();
         let p = &app.world().resource::<ProgressResource>().0;
         assert_eq!(p.weekly_goal_progress.get("weekly_5_wins"), Some(&1));
-        assert!(p.weekly_goal_progress.get("weekly_3_no_undo").is_none());
+        assert!(!p.weekly_goal_progress.contains_key("weekly_3_no_undo"));
     }
 
     #[test]