Enable canvas focus for keyboard input by setting tabindex and automatically focusing during gameplay.

cmd/client/web/game.js

@@ -73,6 +73,7 @@ function setUIState(newState) {
             if (canvas) {
                 canvas.classList.add('game-active');
                 canvas.style.visibility = 'visible';
+                canvas.focus(); // Canvas fokussieren für Tastatureingaben
             }
             // No overlays shown during gameplay
             break;
@@ -222,6 +223,13 @@ window.onWasmReady = function() {
     console.log('✅ WASM fully initialized');
     wasmReady = true;
 
+    // Canvas fokussierbar machen
+    const canvas = document.querySelector('canvas');
+    if (canvas) {
+        canvas.setAttribute('tabindex', '1');
+        console.log('✅ Canvas tabindex gesetzt');
+    }
+
     // Switch to menu state
     setUIState(UIState.MENU);