refactor(mobile): widgets (#9291)

* refactor(mobile): widgets

* update

mobile/lib/widgets/common/thumbhash_placeholder.dart

@@ -0,0 +1,48 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:immich_mobile/widgets/asset_grid/thumbnail_placeholder.dart';
+import 'package:immich_mobile/widgets/common/fade_in_placeholder_image.dart';
+import 'package:octo_image/octo_image.dart';
+
+/// Simple set to show [OctoPlaceholder.circularProgressIndicator] as
+/// placeholder and [OctoError.icon] as error.
+OctoSet blurHashOrPlaceholder(
+  Uint8List? blurhash, {
+  BoxFit? fit,
+  Text? errorMessage,
+}) {
+  return OctoSet(
+    placeholderBuilder: blurHashPlaceholderBuilder(blurhash, fit: fit),
+    errorBuilder: blurHashErrorBuilder(blurhash, fit: fit),
+  );
+}
+
+OctoPlaceholderBuilder blurHashPlaceholderBuilder(
+  Uint8List? blurhash, {
+  BoxFit? fit,
+}) {
+  return (context) => blurhash == null
+      ? const ThumbnailPlaceholder()
+      : FadeInPlaceholderImage(
+          placeholder: const ThumbnailPlaceholder(),
+          image: MemoryImage(blurhash),
+          fit: fit ?? BoxFit.cover,
+        );
+}
+
+OctoErrorBuilder blurHashErrorBuilder(
+  Uint8List? blurhash, {
+  BoxFit? fit,
+  Text? message,
+  IconData? icon,
+  Color? iconColor,
+  double? iconSize,
+}) {
+  return OctoError.placeholderWithErrorIcon(
+    blurHashPlaceholderBuilder(blurhash, fit: fit),
+    message: message,
+    icon: icon,
+    iconColor: iconColor,
+    iconSize: iconSize,
+  );
+}