Fix bugs from code review (state flow, idle timer, logger, kiosk, temp files)

src/screens/CameraScreen.tsx

@@ -159,8 +159,18 @@ export default function CameraScreen({
   }, []);
 
   // Cancel capture process
-  const handleLocalCancel = () => {
+  const handleLocalCancel = async () => {
     if (burstTimerRef.current) clearTimeout(burstTimerRef.current);
+    
+    // Clean up any temp files from a partially completed burst
+    for (const uri of burstUris) {
+      try {
+        await FileSystem.deleteAsync(uri, { idempotent: true });
+      } catch (e) {
+        console.warn('Failed to delete temp file on cancel:', e);
+      }
+    }
+    
     setCountdown(countdownDuration);
     setIsCapturing(false);
     setBurstIndex(0);