[auto] show detected step direction in bottom-left corner

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/App.css

@@ -76,6 +76,21 @@
   z-index: 150;
 }
 
+.detected-step {
+  position: fixed;
+  bottom: 24px;
+  left: 24px;
+  z-index: 40;
+  font-family: system-ui, sans-serif;
+  font-size: 28px;
+  font-weight: 800;
+  color: #00ffcc;
+  background: rgba(0, 0, 0, 0.7);
+  padding: 8px 16px;
+  border-radius: 8px;
+  pointer-events: none;
+}
+
 .framing-line {
   position: fixed;
   bottom: 15%;

src/DebugApp.tsx

@@ -58,6 +58,9 @@ export function DebugApp() {
         framingHint={framingHint}
       />
       <ArrowGame ref={arrowGameRef} active={gameReady} />
+      {gameReady && gesture && (
+        <div className="detected-step">{gesture.replace('step-', '').toUpperCase()}</div>
+      )}
       {settings.showDebug && (
         <>
           <StepGraphs