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/replay_overlay/mod.rs

@@ -25,15 +25,14 @@
 
 mod format;
 mod input;
-mod update;
 #[cfg(test)]
 mod tests;
+mod update;
 
 pub(crate) use self::format::*;
 pub(crate) use self::input::*;
 pub(crate) use self::update::*;
 
-use bevy::prelude::*;
 use crate::events::{DrawRequestEvent, MoveRequestEvent, StateChangedEvent, UndoRequestEvent};
 use crate::font_plugin::FontResource;
 use crate::platform::SHOW_KEYBOARD_ACCELERATORS;
@@ -44,6 +43,7 @@ use crate::ui_theme::{
     STATE_SUCCESS, STATE_SUCCESS_HC, TEXT_PRIMARY, TEXT_PRIMARY_HC, TEXT_SECONDARY, TYPE_BODY,
     TYPE_CAPTION, TYPE_HEADLINE, VAL_SPACE_1, VAL_SPACE_2, VAL_SPACE_4, Z_DROP_OVERLAY,
 };
+use bevy::prelude::*;
 
 // ---------------------------------------------------------------------------
 // Z-index — see `ui_theme::Z_MODAL_SCRIM` (200) for the next layer above.
@@ -316,7 +316,6 @@ pub struct ReplayOverlayScrubNotch;
 #[derive(Component, Debug)]
 pub struct ReplayOverlayScrubNotchLabel;
 
-
 /// Marker on the keybind-hint footer row at the bottom edge of the
 /// banner. Carries two `Text` children: a vim-style mode indicator
 /// (`▌ NORMAL │ replay`) on the left and the keybind hint
@@ -1270,4 +1269,3 @@ fn win_move_marker_pct(state: &ReplayPlaybackState) -> Option<f32> {
     let frac = (idx as f32 / total as f32).clamp(0.0, 1.0);
     Some(frac * 100.0)
 }
-