Use 100vh and the viewport-fit toggle for the installed app

Researched it instead of guessing again. Launched from the homescreen, WebKit
resolves the DYNAMIC viewport and every env() inset once against a provisional
geometry and does not revisit them until the geometry is "exercised" — a
rotation. That is the whole bug, and it also explains why listening for a signal
could never fix it: nothing fires, so there is nothing to observe.

Two known workarounds, both applied. Standalone has no toolbars, so 100vh is
correct AND stable from the first frame — dvh only exists for the browser's
disappearing toolbars, so it now applies only there. And toggling viewport-fit
off and back on at boot forces WebKit to recalculate, without the user rotating
anything.

Countdown moved up off the ad boards — the strip's own projected line is its
ceiling now, so it stays in the stands whatever the phone does to the layout,
with a 1px shadow to carry it over the crowd.

Sources: gist.github.com/fozzedout/5e77925381991a9570151550992baf14

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

main.js

@@ -21,6 +21,17 @@ function frame(now) {
 }
 
 fitViewport();
+// iOS PWA cold start. Launched from the homescreen, WebKit resolves the viewport AND every env()
+// safe-area inset once, against a provisional geometry, and never revisits them until the geometry
+// is "exercised" — which is why the game only filled the screen after a rotate and back, and why
+// waiting for an event could never work: nothing fires. Toggling viewport-fit off and on is the
+// known WebKit workaround: it forces that recalculation without the user rotating anything.
+// Standalone only, because that is the only mode with the bug.
+if (navigator.standalone || matchMedia('(display-mode: standalone)').matches) {
+  const meta = document.querySelector('meta[name=viewport]'), real = meta.content;
+  meta.content = real.replace('viewport-fit=cover', 'viewport-fit=auto');
+  requestAnimationFrame(() => { meta.content = real; requestAnimationFrame(fitViewport); });
+}
 setupPoint();
 // warm the pixel HUD font so the canvas never paints a system-serif fallback frame
 if (document.fonts) { document.fonts.load('700 8px Silkscreen'); document.fonts.load('400 8px Silkscreen'); }