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/help_plugin.rs

@@ -159,7 +159,7 @@ const CONTROL_SECTIONS: &[ControlSection] = &[
             ControlRow { keys: "||", description: "Pause / resume" },
             ControlRow { keys: "?", description: "This help screen" },
             ControlRow { keys: "→", description: "Show a hint" },
-            ControlRow { keys: "≡", description: "Menu: Stats, Settings, Profile, Achievements" },
+            ControlRow { keys: "≡", description: "Open menu (Stats, Settings, Profile...)" },
         ],
     },
 ];