portrait: lock orientation + portrait-optimized felt table

- Lock the app to portrait: AndroidManifest screenOrientation="portrait" and PWA
  manifest orientation "portrait".
- GameTable felt now occupies the middle band (between top HUD and the hand) with
  portrait proportions (w<=560, tall) so the you/partner/opponents diamond fits a
  tall screen comfortably instead of a wide landscape ellipse.

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

src/components/GameTable.tsx

@@ -184,9 +184,9 @@ export function GameTable({
         )}
       </AnimatePresence>
 
-      {/* Felt table */}
-      <div className="absolute inset-0 flex items-center justify-center p-4">
-        <div className="felt relative w-[min(94vw,1100px)] h-[min(82vh,720px)] rounded-[42%]">
+      {/* Felt table — portrait proportions (tall, centered between HUD and hand) */}
+      <div className="absolute inset-x-0 top-16 bottom-44 flex items-center justify-center p-3">
+        <div className="felt relative w-[min(96vw,560px)] h-full max-h-[680px] rounded-[44%]">
           {/* opponent + partner seats */}
           <SeatAvatar seat={2} className="absolute top-3 left-1/2 -translate-x-1/2" />
           <SeatAvatar seat={1} className="absolute top-1/2 right-3 -translate-y-1/2" />