claude refactorings, flutter best practices, platform dependent changes, general cleanup

lib/view/pages/files/files_upload_dialog.dart

@@ -3,9 +3,8 @@ import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:loader_overlay/loader_overlay.dart';
 import 'package:nextcloud/nextcloud.dart';
-import 'package:uuid/uuid.dart';
 
-import '../../../api/marianumcloud/webdav/webdavApi.dart';
+import '../../../api/marianumcloud/webdav/webdav_api.dart';
 import '../../../widget/confirm_dialog.dart';
 import '../../../widget/focus_behaviour.dart';
 
@@ -107,14 +106,14 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
         _showUploadError('Verbindung fehlgeschlagen: $e');
         return;
       }
-      var conflictingFiles = _uploadableFiles.where((file) {
-        var fileName = file.fileName;
-        return result.any((element) => Uri.decodeComponent(element.href!).endsWith('/$fileName'));
+      final conflictingFiles = _uploadableFiles.where((file) {
+        final fileName = file.fileName;
+        return result.any((element) => Uri.decodeComponent((element as WebDavResponse).href!).endsWith('/$fileName'));
       }).toList();
 
-      if(conflictingFiles.isNotEmpty) {
+      if (conflictingFiles.isNotEmpty) {
         if (!mounted) return;
-        bool replaceFiles = await showDialog(
+        final replaceFiles = await showDialog<bool>(
           context: context,
           barrierDismissible: false,
           builder: (context) => AlertDialog(
@@ -160,7 +159,7 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
             )
         );
 
-        if(!replaceFiles) {
+        if (replaceFiles != true) {
           setState(() {
             _isUploading = false;
             _overallProgressValue = 0.0;
@@ -179,7 +178,10 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
       var fileName = file.fileName;
       var filePath = file.filePath;
 
-      if(widget.uniqueNames) fileName = '${fileName.split('.').first}-${const Uuid().v4()}.${fileName.split('.').last}';
+      if (widget.uniqueNames) {
+        final unique = DateTime.now().microsecondsSinceEpoch.toRadixString(36);
+        fileName = '${fileName.split('.').first}-$unique.${fileName.split('.').last}';
+      }
 
       var fullRemotePath = '${widget.remotePath}/$fileName';
 
@@ -187,7 +189,7 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
         _infoText = '${_uploadableFiles.indexOf(file) + 1}/${_uploadableFiles.length}';
       });
 
-      final dynamic uploadTask;
+      final HttpClientResponse uploadTask;
       try {
         uploadTask = await webdavClient.putFile(
           File(filePath),