style: cargo fmt under rustfmt 1.9 and gate formatting in CI

The repo was formatted under an older stable; rustfmt 1.9 (Rust 1.95)
wraps signatures and call sites differently, so every touched file was
picking up unrelated formatting hunks. One mechanical pass, and a
'cargo fmt --check' step in the test workflow (same pinned 1.95.0
toolchain) so drift can't accumulate again.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

solitaire_engine/src/table_plugin.rs

@@ -7,8 +7,8 @@
 use bevy::prelude::*;
 use bevy::window::WindowResized;
 use solitaire_core::KlondikePile;
-use solitaire_core::{FOUNDATIONS, TABLEAUS};
 use solitaire_core::Suit;
+use solitaire_core::{FOUNDATIONS, TABLEAUS};
 
 use crate::events::{HintVisualEvent, StateChangedEvent};
 use crate::game_plugin::GameMutation;
@@ -385,7 +385,11 @@ fn on_window_resized(
     >,
     mut marker_outlines: Query<
         &mut Sprite,
-        (Without<PileMarker>, Without<TableBackground>, Without<Text2d>),
+        (
+            Without<PileMarker>,
+            Without<TableBackground>,
+            Without<Text2d>,
+        ),
     >,
     mut marker_labels: Query<&mut TextFont, With<Text2d>>,
 ) {
@@ -437,8 +441,7 @@ fn on_window_resized(
             // must be re-derived here too or a resize (fold/unfold, rotation)
             // leaves them at the stale size — visible as oversized grey
             // frames on empty piles.
-            let outline_size =
-                new_layout.card_size + Vec2::splat(PILE_MARKER_OUTLINE_WIDTH * 2.0);
+            let outline_size = new_layout.card_size + Vec2::splat(PILE_MARKER_OUTLINE_WIDTH * 2.0);
             let font_size = new_layout.card_size.x * 0.28;
             for child in children.into_iter().flatten() {
                 if let Ok(mut outline) = marker_outlines.get_mut(*child) {
@@ -593,8 +596,6 @@ fn pile_cards(
     }
 }
 
-
-
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -703,7 +704,10 @@ mod tests {
             }
         }
         assert_eq!(outlines, 12, "all 12 markers carry an outline child");
-        assert!(labels >= 11, "tableau + foundation markers carry watermarks");
+        assert!(
+            labels >= 11,
+            "tableau + foundation markers carry watermarks"
+        );
     }
 
     #[test]
@@ -939,10 +943,7 @@ mod tests {
 
     #[test]
     fn suit_symbol_all_four_are_distinct() {
-        let symbols: Vec<&str> = Suit::SUITS
-            .iter()
-            .map(suit_symbol)
-            .collect();
+        let symbols: Vec<&str> = Suit::SUITS.iter().map(suit_symbol).collect();
         let unique: std::collections::HashSet<&&str> = symbols.iter().collect();
         assert_eq!(unique.len(), 4, "all four suit symbols must be distinct");
     }