refactored HTTP error handling and streamlined UI components by centralizing shared logic and removing redundant parameters

lib/widget/chat_background_picker_sheet.dart

@@ -4,6 +4,7 @@ import 'package:flutter/material.dart';
 import 'package:image_picker/image_picker.dart';
 
 import '../routing/app_routes.dart';
+import 'details_bottom_sheet.dart';
 import 'file_pick.dart';
 
 /// Bottom sheet with "from gallery" and "take photo" actions for choosing a
@@ -13,44 +14,30 @@ import 'file_pick.dart';
 /// cancelled everything.
 Future<Uint8List?> showChatBackgroundPickerSheet(BuildContext context) async {
   Uint8List? result;
-  await showModalBottomSheet<void>(
-    context: context,
-    isScrollControlled: true,
-    showDragHandle: true,
-    useSafeArea: true,
-    builder: (sheetContext) => SafeArea(
-      child: SingleChildScrollView(
-        padding: EdgeInsets.only(
-          bottom: 16 + MediaQuery.viewInsetsOf(sheetContext).bottom,
-        ),
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
-          crossAxisAlignment: CrossAxisAlignment.stretch,
-          children: [
-            ListTile(
-              leading: const Icon(Icons.photo_library_outlined),
-              title: const Text('Aus Galerie wählen'),
-              onTap: () async {
-                final bytes = await _pickRaw(FilePick.singleGalleryPick);
-                if (bytes == null || !sheetContext.mounted) return;
-                result = bytes;
-                Navigator.of(sheetContext).pop();
-              },
-            ),
-            ListTile(
-              leading: const Icon(Icons.photo_camera_outlined),
-              title: const Text('Foto aufnehmen'),
-              onTap: () async {
-                final bytes = await _pickRaw(FilePick.cameraPick);
-                if (bytes == null || !sheetContext.mounted) return;
-                result = bytes;
-                Navigator.of(sheetContext).pop();
-              },
-            ),
-          ],
-        ),
+  await showDetailsBottomSheet(
+    context,
+    children: (sheetContext) => [
+      ListTile(
+        leading: const Icon(Icons.photo_library_outlined),
+        title: const Text('Aus Galerie wählen'),
+        onTap: () async {
+          final bytes = await _pickRaw(FilePick.singleGalleryPick);
+          if (bytes == null || !sheetContext.mounted) return;
+          result = bytes;
+          Navigator.of(sheetContext).pop();
+        },
       ),
-    ),
+      ListTile(
+        leading: const Icon(Icons.photo_camera_outlined),
+        title: const Text('Foto aufnehmen'),
+        onTap: () async {
+          final bytes = await _pickRaw(FilePick.cameraPick);
+          if (bytes == null || !sheetContext.mounted) return;
+          result = bytes;
+          Navigator.of(sheetContext).pop();
+        },
+      ),
+    ],
   );
   return result;
 }