fix: render action callouts as DOM elements to overlay opponent videos

- Switch `animateActionText` from Phaser text to DOM container to ensure it renders above opponent portrait videos (which are DOM-based and thus always on top of the Phaser canvas)
- Apply text-shadow via inline CSS for better cross-browser compatibility with DOM text
- Increase depth to `D.modal + 100` to guarantee visibility over all other layers

public/src/games/blackjack/BlackjackGame.js

@@ -882,23 +882,33 @@ export default class BlackjackGame extends Phaser.Scene {
     const tx = (px + pos.x) / 2;
     const ty = (py + pos.y) / 2;
 
-    const txt = this.add.text(tx, ty, label, {
-      fontFamily: '"Julius Sans One"',
-      fontSize: '44px',
-      color: ACTION_COLORS[action] ?? '#ffffff',
-      fontStyle: 'bold',
-      stroke: '#000000', strokeThickness: 5,
-    }).setOrigin(0.5).setAlpha(0).setScale(1.4).setDepth(D.modal);
+    // Rendered as a DOM element with a very high depth so it sits above
+    // everything, including the opponent portrait videos (which are DOM and
+    // therefore always drawn above the Phaser canvas).
+    const el = document.createElement('div');
+    el.textContent = label;
+    el.style.cssText = [
+      'font-family:"Julius Sans One",sans-serif',
+      'font-size:44px',
+      'font-weight:bold',
+      `color:${ACTION_COLORS[action] ?? '#ffffff'}`,
+      'text-shadow:1px 1px 0 #000,-1px 1px 0 #000,1px -1px 0 #000,-1px -1px 0 #000,2px 0 0 #000,-2px 0 0 #000,0 2px 0 #000,0 -2px 0 #000,0 0 6px rgba(0,0,0,0.85)',
+      'white-space:nowrap',
+      'pointer-events:none',
+      'user-select:none',
+    ].join(';');
+
+    const dom = this.add.dom(tx, ty, el).setDepth(D.modal + 100).setAlpha(0).setScale(1.4);
 
     this.tweens.add({
-      targets: txt, alpha: 1, scaleX: 1, scaleY: 1,
+      targets: dom, alpha: 1, scaleX: 1, scaleY: 1,
       duration: 180, ease: 'Back.Out',
     });
     this.time.delayedCall(1000, () => {
       this.tweens.add({
-        targets: txt, alpha: 0, y: ty - 26,
+        targets: dom, alpha: 0, y: ty - 26,
         duration: 350, ease: 'Power2',
-        onComplete: () => txt.destroy(),
+        onComplete: () => dom.destroy(),
       });
     });
   }