fix: center trick pile; add error boundary (surface post-buy crash)

- Trick area: smaller offsets (±50/52) + retuned scale so the played pile sits
  centered in the felt instead of flung out to the side seats.
- ErrorBoundary around screens + overlays: a render error now shows a recoverable
  in-app message with the cause (and logs componentStack) instead of the browser's
  blank "page couldn't load" — helps pinpoint the post-purchase crash.

Verified: tsc + next build clean; web rebuilt on :1500.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/page.tsx

@@ -21,6 +21,7 @@ import { NotificationToaster } from "@/components/online/NotificationToaster";
 import { ResumeGameBar } from "@/components/online/ResumeGameBar";
 import { CelebrationOverlay } from "@/components/online/CelebrationOverlay";
 import { MusicToggle } from "@/components/online/MusicToggle";
+import { ErrorBoundary } from "@/components/ErrorBoundary";
 import { PublicProfileModal } from "@/components/online/PublicProfileModal";
 import { CapacitorBack } from "@/components/CapacitorBack";
 import { useSessionStore } from "@/lib/session-store";
@@ -193,13 +194,15 @@ export default function Page() {
     // reducedMotion="user" makes every Framer Motion animation honor the OS
     // "reduce motion" accessibility setting (coin rain, confetti, count-ups…).
     <MotionConfig reducedMotion="user">
-      {renderScreen(screen)}
-      <DailyRewardModal />
-      <NotificationToaster />
-      <ResumeGameBar />
-      <CelebrationOverlay />
-      <MusicToggle />
-      <PublicProfileModal />
+      <ErrorBoundary>
+        {renderScreen(screen)}
+        <DailyRewardModal />
+        <NotificationToaster />
+        <ResumeGameBar />
+        <CelebrationOverlay />
+        <MusicToggle />
+        <PublicProfileModal />
+      </ErrorBoundary>
       <CapacitorBack />
       {loading && null}
     </MotionConfig>