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/achievement_plugin.rs

@@ -533,9 +533,9 @@ fn spawn_achievements_screen(
                 }
 
                 let (name_color, desc_color, prefix) = if record.unlocked {
-                    (ACCENT_PRIMARY, TEXT_PRIMARY, "\u{2713} ")
+                    (ACCENT_PRIMARY, TEXT_PRIMARY, "+ ")
                 } else {
-                    (TEXT_DISABLED, TEXT_DISABLED, "\u{25CB} ")
+                    (TEXT_DISABLED, TEXT_DISABLED, "- ")
                 };
 
                 let tooltip_text = tooltip_for_row(record.unlocked, def);