Add web-specific video viewer and update video player initialization

b0esche_cloud/lib/pages/video_viewer.dart

@@ -1,3 +1,6 @@
+import 'dart:io' show Platform;
+import 'package:flutter/foundation.dart' show kIsWeb;
+import 'video_viewer_web.dart';
 import 'package:flutter/material.dart';
 import 'package:video_player/video_player.dart';
 import '../theme/app_theme.dart';
@@ -24,7 +27,7 @@ class _VideoViewerState extends State<VideoViewer> {
   @override
   void initState() {
     super.initState();
-    _controller = VideoPlayerController.network(widget.videoUrl)
+    _controller = VideoPlayerController.networkUrl(Uri.parse(widget.videoUrl))
       ..initialize()
           .then((_) {
             if (mounted) setState(() => _isInitialized = true);
@@ -42,6 +45,13 @@ class _VideoViewerState extends State<VideoViewer> {
 
   @override
   Widget build(BuildContext context) {
+    if (kIsWeb) {
+      // Use web-specific video viewer
+      return VideoViewerWeb(
+        videoUrl: widget.videoUrl,
+        fileName: widget.fileName,
+      );
+    }
     return Dialog(
       backgroundColor: Colors.transparent,
       child: ConstrainedBox(
@@ -94,11 +104,11 @@ class _VideoViewerState extends State<VideoViewer> {
                         allowScrubbing: true,
                         colors: VideoProgressColors(
                           playedColor: AppTheme.accentColor,
-                          backgroundColor: AppTheme.secondaryText.withOpacity(
+                          backgroundColor: AppTheme.secondaryText.withValues(
-                            0.2,
+                            alpha: 0.2,
                           ),
-                          bufferedColor: AppTheme.secondaryText.withOpacity(
+                          bufferedColor: AppTheme.secondaryText.withValues(
-                            0.5,
+                            alpha: 0.5,
                           ),
                         ),
                       ),
@@ -130,7 +140,7 @@ class _ControlsOverlay extends StatelessWidget {
               child: Icon(
                 Icons.play_arrow,
                 size: 64,
-                color: AppTheme.accentColor.withOpacity(0.8),
+                color: AppTheme.accentColor.withValues(alpha: 0.8),
               ),
             ),
         ],

b0esche_cloud/lib/pages/video_viewer_web.dart

@@ -0,0 +1,60 @@
+import 'package:flutter/material.dart';
+import '../theme/app_theme.dart';
+
+class VideoViewerWeb extends StatelessWidget {
+  final String videoUrl;
+  final String fileName;
+
+  const VideoViewerWeb({
+    super.key,
+    required this.videoUrl,
+    required this.fileName,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Dialog(
+      backgroundColor: Colors.transparent,
+      child: ConstrainedBox(
+        constraints: const BoxConstraints(maxWidth: 700, maxHeight: 500),
+        child: Container(
+          decoration: AppTheme.glassDecoration,
+          padding: const EdgeInsets.all(16),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              Row(
+                children: [
+                  Expanded(
+                    child: Text(
+                      fileName,
+                      style: const TextStyle(
+                        color: AppTheme.primaryText,
+                        fontWeight: FontWeight.bold,
+                        fontSize: 18,
+                      ),
+                      overflow: TextOverflow.ellipsis,
+                    ),
+                  ),
+                  IconButton(
+                    icon: const Icon(Icons.close, color: AppTheme.primaryText),
+                    onPressed: () => Navigator.of(context).pop(),
+                  ),
+                ],
+              ),
+              const SizedBox(height: 16),
+              Expanded(
+                child: Center(
+                  child: AspectRatio(
+                    aspectRatio: 16 / 9,
+                    child: HtmlElementView(viewType: videoUrl),
+                  ),
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}