fix(android): UX pass — pause stacking, timer, help content, achievement glyphs

BUG-1: pause_plugin — auto_resume_on_overlay system despawns PauseScreen
whenever any other ModalScrim becomes live; fixes Pause modal stacking on
top of Stats / Settings / Help / Achievements / Profile overlays opened
from the HUD menu while paused.

BUG-2: game_plugin — tick_elapsed_time skips the first delta_secs after
AppLifecycle::WillSuspend/Suspended so the Android post-resume frame spike
(equal to the full suspension duration) no longer inflates the in-game timer.

UX-2: help_plugin — Android build gets a touch-specific CONTROL_SECTIONS
(Tap / New Game / HUD buttons); desktop sections (Mouse, Keyboard drag,
Mode Launcher, Overlays) remain on non-Android builds only.

UX-3: achievement_plugin — replace \u{25CB} (○) and \u{2713} (✓) prefixes
with ASCII "- " / "+ "; both Geometric Shapes codepoints are absent from
FiraMono and rendered as the fallback letter "o".

Phase 8 work from previous session (already compiled, not yet committed):
hud_plugin — HUD visual hierarchy (Undo/Pause bright, nav buttons dim);
  menu popover — Help + Game Modes entries added (7 items total).
card_plugin — stock badge drops "·" prefix, shows plain count.
pause_plugin — Draw Mode segmented control (Draw 1 / Draw 3 explicit buttons).

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

solitaire_engine/src/help_plugin.rs

@@ -135,6 +135,36 @@ struct ControlSection {
     rows: &'static [ControlRow],
 }
 
+#[cfg(target_os = "android")]
+const CONTROL_SECTIONS: &[ControlSection] = &[
+    ControlSection {
+        title: "Touch",
+        rows: &[
+            ControlRow { keys: "Tap stock", description: "Draw from stock" },
+            ControlRow { keys: "Drag card", description: "Move cards between piles" },
+            ControlRow { keys: "Tap foundation area", description: "Auto-move top card to foundation" },
+        ],
+    },
+    ControlSection {
+        title: "New Game",
+        rows: &[
+            ControlRow { keys: "New+", description: "Start a new Classic game" },
+            ControlRow { keys: "Modes↓", description: "Pick Daily, Zen, Challenge, or Time Attack" },
+        ],
+    },
+    ControlSection {
+        title: "HUD buttons",
+        rows: &[
+            ControlRow { keys: "←", description: "Undo last move" },
+            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" },
+        ],
+    },
+];
+
+#[cfg(not(target_os = "android"))]
 const CONTROL_SECTIONS: &[ControlSection] = &[
     ControlSection {
         title: "Gameplay",