refactor: Use snackbar to show snapshot id copy notification

lib/logic/get_it/navigation.dart

@@ -21,11 +21,12 @@ class NavigationService {
     );
   }
 
-  void showSnackBar(final String text) {
+  void showSnackBar(final String text, {final SnackBarBehavior? behavior}) {
     final ScaffoldMessengerState state = scaffoldMessengerKey.currentState!;
     final SnackBar snack = SnackBar(
       content: Text(text),
       duration: const Duration(seconds: 2),
+      behavior: behavior,
     );
     state.showSnackBar(snack);
   }

lib/ui/pages/backups/snapshot_id_list_tile.dart

@@ -1,10 +1,9 @@
-import 'dart:async';
-
 import 'package:easy_localization/easy_localization.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:selfprivacy/config/get_it_config.dart';
 
-class SnapshotIdListTile extends StatefulWidget {
+class SnapshotIdListTile extends StatelessWidget {
   const SnapshotIdListTile({
     required this.snapshotId,
     super.key,
@@ -12,41 +11,20 @@ class SnapshotIdListTile extends StatefulWidget {
 
   final String snapshotId;
 
-  @override
-  State<SnapshotIdListTile> createState() => _SnapshotIdListTileState();
-}
-
-class _SnapshotIdListTileState extends State<SnapshotIdListTile> {
-  bool copiedToClipboard = false;
-
-  void handleTimeout() {
-    setState(() {
-      copiedToClipboard = false;
-    });
-  }
-
   @override
   Widget build(final BuildContext context) => ListTile(
         onLongPress: () {
-          if (copiedToClipboard == false) {
-            Clipboard.setData(ClipboardData(text: widget.snapshotId));
-            Timer(const Duration(seconds: 2), handleTimeout);
-            setState(() {
-              copiedToClipboard = true;
-            });
-          }
+          Clipboard.setData(ClipboardData(text: snapshotId));
+          getIt<NavigationService>().showSnackBar(
+            'basis.copied_to_clipboard'.tr(),
+            behavior: SnackBarBehavior.floating,
+          );
         },
         leading: Icon(
           Icons.numbers_outlined,
           color: Theme.of(context).colorScheme.onSurface,
         ),
-        title: Text(
-          copiedToClipboard
-              ? 'basis.copied_to_clipboard'.tr()
-              : 'backup.snapshot_id_title'.tr(),
-        ),
-        subtitle: Text(
-          copiedToClipboard ? '' : widget.snapshotId,
-        ),
+        title: Text('backup.snapshot_id_title'.tr()),
+        subtitle: Text(snapshotId),
       );
 }

lib/ui/pages/backups/snapshot_modal.dart

@@ -52,7 +52,9 @@ class _SnapshotModalState extends State<SnapshotModal> {
         .state
         .getServiceById(widget.snapshot.serviceId);
 
-    return ListView(
+    return Scaffold(
+      backgroundColor: Colors.transparent,
+      body: ListView(
         controller: widget.scrollController,
         padding: const EdgeInsets.all(16),
         children: [
@@ -160,6 +162,7 @@ class _SnapshotModalState extends State<SnapshotModal> {
               ),
             )
         ],
+      ),
     );
   }
 }