Refactor share file dialog to auto-create share link and simplify error handling

b0esche_cloud/lib/pages/file_explorer.dart

@@ -1310,10 +1310,7 @@ class _FileExplorerState extends State<FileExplorer>
                   onPressed: () => _downloadFile(file),
                 ),
                 IconButton(
-                  icon: const Icon(
+                  icon: const Icon(Icons.share, color: AppTheme.secondaryText),
-                    Icons.share_outlined,
-                    color: AppTheme.secondaryText,
-                  ),
                   splashColor: Colors.transparent,
                   highlightColor: Colors.transparent,
                   onPressed: () => _shareFile(file),

b0esche_cloud/lib/widgets/share_file_dialog.dart

@@ -57,18 +57,12 @@ class _ShareFileDialogState extends State<ShareFileDialog> {
           _isLoading = false;
         });
       } else {
-        setState(() {
+        // Auto-create share link
-          _shareUrl = null;
+        await _createShareLink();
-          _urlController.clear();
-          _isLoading = false;
-        });
       }
     } catch (e) {
-      setState(() {
+      // Try to create share link anyway
-        _shareUrl = null;
+      await _createShareLink();
-        _urlController.clear();
-        _isLoading = false;
-      });
     }
   }
 
@@ -164,25 +158,6 @@ class _ShareFileDialogState extends State<ShareFileDialog> {
                 )
               else if (_error != null)
                 Text(_error!, style: TextStyle(color: Colors.red[400]))
-              else if (_shareUrl == null)
-                Column(
-                  crossAxisAlignment: CrossAxisAlignment.start,
-                  children: [
-                    Text(
-                      'No share link exists for this file.',
-                      style: TextStyle(color: AppTheme.secondaryText),
-                    ),
-                    const SizedBox(height: 16),
-                    ElevatedButton(
-                      onPressed: _createShareLink,
-                      style: ElevatedButton.styleFrom(
-                        backgroundColor: AppTheme.accentColor,
-                        foregroundColor: Colors.white,
-                      ),
-                      child: const Text('Create Share Link'),
-                    ),
-                  ],
-                )
               else
                 Column(
                   crossAxisAlignment: CrossAxisAlignment.start,