chore: cargo fmt across workspace; add analytics domain to CSP

- Apply cargo fmt to solitaire_engine, solitaire_server formatting.
- solitaire_server/src/lib.rs: add https://analytics.aleshym.co to
  script-src, img-src, and connect-src so the analytics beacon loads
  without a CSP violation.
- docs and README updates.

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

solitaire_engine/src/card_plugin.rs

@@ -16,10 +16,9 @@ use bevy::color::Color;
 use bevy::prelude::*;
 use bevy::sprite::Anchor;
 use bevy::window::WindowResized;
+use klondike::{Foundation, KlondikePile, Tableau};
 use solitaire_core::card::{Card, Rank, Suit};
 use solitaire_core::game_state::{DrawMode, GameState};
-use klondike::{Foundation, KlondikePile, Tableau};
-
 
 use crate::animation_plugin::{CARD_ANIM_Z_LIFT, CardAnim, EffectiveSlideDuration};
 use crate::card_animation::CardAnimation;
@@ -2355,16 +2354,16 @@ fn update_tableau_fan_frac(
         Tableau::Tableau6,
         Tableau::Tableau7,
     ]
-        .into_iter()
-        .map(|tableau| {
-            game.0
-                .pile(klondike::KlondikePile::Tableau(tableau))
-                .into_iter()
-                .filter(|c| c.face_up)
-                .count()
-        })
-        .max()
-        .unwrap_or(0);
+    .into_iter()
+    .map(|tableau| {
+        game.0
+            .pile(klondike::KlondikePile::Tableau(tableau))
+            .into_iter()
+            .filter(|c| c.face_up)
+            .count()
+    })
+    .max()
+    .unwrap_or(0);
 
     let card_h = layout.0.card_size.y;
     let avail = layout.0.available_tableau_height;
@@ -2575,8 +2574,7 @@ mod tests {
             "need at least 3 waste cards for this test"
         );
 
-        let waste_ids: std::collections::HashSet<u32> =
-            waste_pile.iter().map(|c| c.id).collect();
+        let waste_ids: std::collections::HashSet<u32> = waste_pile.iter().map(|c| c.id).collect();
 
         let layout = crate::layout::compute_layout(Vec2::new(1280.0, 800.0), 0.0, 0.0, true);
         let positions = card_positions(&g, &layout);
@@ -2628,8 +2626,7 @@ mod tests {
         let count = waste_pile.len();
         assert!(count >= 2, "need at least 2 waste cards");
 
-        let waste_ids: std::collections::HashSet<u32> =
-            waste_pile.iter().map(|c| c.id).collect();
+        let waste_ids: std::collections::HashSet<u32> = waste_pile.iter().map(|c| c.id).collect();
         let layout = crate::layout::compute_layout(Vec2::new(1280.0, 800.0), 0.0, 0.0, true);
         let positions = card_positions(&g, &layout);