fix(android): UX-1/UX-5b/UX-7/BUG-3 — safe-area modals, glyph, help wrap, modal guard

- UX-1 (safe_area.rs): apply_safe_area_to_modal_scrims pads ModalScrim
  bottom by insets.bottom / scale_factor so Done buttons clear the
  gesture bar; fires on inset change + Added<ModalScrim>
- UX-5b (home_plugin.rs): replace Geometric Shapes (U+25xx, missing
  from FiraMono) with card suits U+2660/2665/2666
- UX-7 (help_plugin.rs): shorten Android ≡ button description to
  "Open menu (Stats, Settings, Profile...)" — fits one line at 360 dp
- BUG-3 (hud_plugin.rs): guard spawn_menu_popover with
  scrims.is_empty() so tapping ≡ while a modal is open is a no-op

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

solitaire_engine/src/safe_area.rs

@@ -19,6 +19,8 @@
 
 use bevy::prelude::*;
 
+use crate::ui_modal::ModalScrim;
+
 /// Pixel sizes of the system-reserved regions on each edge of the
 /// surface. Zero on desktop.
 #[derive(Resource, Debug, Clone, Copy, Default, PartialEq)]
@@ -54,7 +56,7 @@ pub struct SafeAreaInsetsPlugin;
 impl Plugin for SafeAreaInsetsPlugin {
     fn build(&self, app: &mut App) {
         app.init_resource::<SafeAreaInsets>()
-            .add_systems(Update, apply_safe_area_anchors);
+            .add_systems(Update, (apply_safe_area_anchors, apply_safe_area_to_modal_scrims));
 
         #[cfg(target_os = "android")]
         app.add_systems(Update, android::refresh_insets);
@@ -87,6 +89,29 @@ fn apply_safe_area_anchors(
     }
 }
 
+/// Pads the bottom of every [`ModalScrim`] by the logical bottom inset so
+/// modal cards don't extend into the Android gesture-navigation zone.
+///
+/// Fires when [`SafeAreaInsets`] changes (covers the common case of insets
+/// arriving a few frames after app start) AND when a new `ModalScrim` is
+/// spawned (covers modals opened after insets have already settled).
+fn apply_safe_area_to_modal_scrims(
+    insets: Res<SafeAreaInsets>,
+    windows: Query<&Window>,
+    mut scrims: Query<&mut Node, With<ModalScrim>>,
+    new_scrims: Query<(), (With<ModalScrim>, Added<ModalScrim>)>,
+) {
+    let has_new = !new_scrims.is_empty();
+    if !insets.is_changed() && !has_new {
+        return;
+    }
+    let scale = windows.iter().next().map_or(1.0, |w| w.scale_factor());
+    let bottom_logical = insets.bottom / scale;
+    for mut node in &mut scrims {
+        node.padding.bottom = Val::Px(bottom_logical);
+    }
+}
+
 #[cfg(target_os = "android")]
 mod android {
     use super::SafeAreaInsets;