fix: declaring constant for image MIME

Author: Abhijeet6395

quickie/src/main/kotlin/io/github/g00fy2/quickie/QRScannerActivity.kt

@@ -98,21 +98,21 @@ internal class QRScannerActivity : AppCompatActivity() {
   }
   private val storagePermissionLauncher = registerForActivityResult(ActivityResultContracts.RequestPermission()) { granted ->
     if (granted) {
-      galleryLauncher.launch("image/*")
+      galleryLauncher.launch(IMAGE_MIME_TYPE)
     } else {
       onFailure(Exception("Storage permission required to select images"))
     }
   }
   private fun launchGalleryPicker() {
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
       if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_MEDIA_IMAGES) == PackageManager.PERMISSION_GRANTED) {
-        galleryLauncher.launch("image/*")
+        galleryLauncher.launch(IMAGE_MIME_TYPE)
       } else {
         storagePermissionLauncher.launch(Manifest.permission.READ_MEDIA_IMAGES)
       }
     } else {
       if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
-        galleryLauncher.launch("image/*")
+        galleryLauncher.launch(IMAGE_MIME_TYPE)
       } else {
         storagePermissionLauncher.launch(Manifest.permission.READ_EXTERNAL_STORAGE)
       }
@@ -284,6 +284,7 @@ internal class QRScannerActivity : AppCompatActivity() {
     const val EXTRA_RESULT_TYPE = "quickie-type"
     const val EXTRA_RESULT_PARCELABLE = "quickie-parcelable"
     const val EXTRA_RESULT_EXCEPTION = "quickie-exception"
+    const val IMAGE_MIME_TYPE="image/*"
     const val RESULT_MISSING_PERMISSION = RESULT_FIRST_USER + 1
     const val RESULT_ERROR = RESULT_FIRST_USER + 2
   }