Enhance image handling in FileViewerDispatch for web and mobile, adding error handling and CORS support

b0esche_cloud/lib/widgets/file_viewer_dispatch.dart

@@ -104,28 +104,47 @@ class FileViewerDispatch {
         ),
       );
     } else if (mimeType.startsWith('image/')) {
+      Widget child;
+      if (kIsWeb) {
+        // Use HTML img element for web to handle CORS
+        ui_web.platformViewRegistry.registerViewFactory(viewerId, (int viewId) {
+          final imgElement = web.HTMLImageElement()
+            ..src = url
+            ..style.width = '100%'
+            ..style.height = '100%'
+            ..style.objectFit = 'contain'
+            ..crossOrigin = 'anonymous';
+
+          imgElement.onError.listen((event) {
+            // Handle error
+          });
+
+          return imgElement;
+        });
+
+        child = HtmlElementView(viewType: viewerId);
+      } else {
+        // For mobile, use Image.network
+        child = Image.network(
+          url,
+          headers: headers,
+          fit: BoxFit.contain,
+          errorBuilder: (context, error, stackTrace) {
+            return Center(
+              child: Text(
+                'Failed to load image',
+                style: TextStyle(color: Colors.red[400]),
+              ),
+            );
+          },
+        );
+      }
+
       return Container(
         color: AppTheme.primaryBackground,
-        child: InteractiveViewer(
+        child: InteractiveViewer(minScale: 0.5, maxScale: 4.0, child: child),
-          minScale: 0.5,
-          maxScale: 4.0,
-          child: Image.network(
-            url,
-            headers: headers,
-            fit: BoxFit.contain,
-            errorBuilder: (context, error, stackTrace) {
-              return Center(
-                child: Text(
-                  'Failed to load image',
-                  style: TextStyle(color: Colors.red[400]),
-                ),
-              );
-            },
-          ),
-        ),
       );
     } else {
-      // Fallback
       return Container(
         color: AppTheme.primaryBackground,
         child: Center(