Handle bad decoded intent parcelables safely

Guard reading the `decoded` Scan extra in MainActivity against
framework unparcel exceptions. Some external or malformed intents can
trigger a NullPointerException in Parcel before app-level checks run.

Return null when unparceling fails so the app falls back to the default
DecodeFragment path instead of crashing on launch.

app/src/main/kotlin/de/markusfisch/android/binaryeye/activity/MainActivity.kt

@@ -148,11 +148,15 @@ class MainActivity : AppCompatActivity() {
 	}
 }
 
-private fun Intent.getScanExtra(name: String): Scan? = if (
-	Build.VERSION.SDK_INT < Build.VERSION_CODES.TIRAMISU
-) {
-	@Suppress("DEPRECATION")
-	getParcelableExtra(name)
-} else {
-	getParcelableExtra(name, Scan::class.java)
+private fun Intent.getScanExtra(name: String): Scan? = try {
+	if (
+		Build.VERSION.SDK_INT < Build.VERSION_CODES.TIRAMISU
+	) {
+		@Suppress("DEPRECATION")
+		getParcelableExtra(name)
+	} else {
+		getParcelableExtra(name, Scan::class.java)
+	}
+} catch (_: Throwable) {
+	null
 }