Add keyboard controls for keypad and casting

app.js

@@ -142,6 +142,7 @@
         
         document.addEventListener('touchmove', handleTouchTrail, {passive: false});
         document.addEventListener('mousemove', handleMouseTrail);
+        document.addEventListener('keydown', handleKeydown);
 
         // CHEAT LISTENER (Tap Year X 5 times)
         document.getElementById('level-name').addEventListener('click', () => {
@@ -514,6 +515,24 @@
         document.body.appendChild(p); setTimeout(() => p.remove(), 800);
     }
 
+    function handleKeydown(e) {
+        const activeEl = document.activeElement;
+        if (activeEl && (activeEl.tagName === 'INPUT' || activeEl.tagName === 'TEXTAREA')) return;
+        if (document.querySelector('.modal-overlay.visible')) return;
+        if (!game.active && !game.forcedAnswer) return;
+        const k = e.key;
+        if (k >= '0' && k <= '9') {
+            pressKey(Number(k));
+        } else if (k === 'Backspace') {
+            e.preventDefault();
+            pressKey('BS');
+        } else if (k === 'Enter') {
+            checkAnswer();
+        } else if (k === 'c' || k === 'C' || k === 'Escape') {
+            pressKey('C');
+        }
+    }
+
     function openStats() {
         game.active = false;
         clearInterval(dementor.interval);