Refactor Send Invitation button to use fixed width for better layout consistency

b0esche_cloud/lib/widgets/organization_settings_dialog.dart

@@ -584,25 +584,28 @@ class _OrganizationSettingsDialogState
           ),
         ),
         const SizedBox(height: 16),
-        ModernGlassButton(
-          onPressed: () {
-            if (_canManage) {
-              final username = usernameController.text.trim();
-              if (username.isNotEmpty) {
-                _inviteUser(username, selectedRole);
-                usernameController.clear();
-              }
-            } else {
-              ScaffoldMessenger.of(context).showSnackBar(
-                const SnackBar(
-                  content: Text(
-                    'You do not have permission to send invitations',
+        SizedBox(
+          width: 120,
+          child: ModernGlassButton(
+            onPressed: () {
+              if (_canManage) {
+                final username = usernameController.text.trim();
+                if (username.isNotEmpty) {
+                  _inviteUser(username, selectedRole);
+                  usernameController.clear();
+                }
+              } else {
+                ScaffoldMessenger.of(context).showSnackBar(
+                  const SnackBar(
+                    content: Text(
+                      'You do not have permission to send invitations',
+                    ),
                   ),
-                ),
-              );
-            }
-          },
-          child: const Text('Send Invitation'),
+                );
+              }
+            },
+            child: const Text('Send Invitation'),
+          ),
         ),
       ],
     );