Fix suggestions positioning using CompositedTransformFollower to properly position dropdown below TextField

b0esche_cloud/lib/widgets/organization_settings_dialog.dart

@@ -38,6 +38,7 @@ class _OrganizationSettingsDialogState
   List<User> _userSuggestions = [];
   late final TextEditingController usernameController;
   final GlobalKey textFieldKey = GlobalKey();
+  final LayerLink link = LayerLink();
 
   @override
   void initState() {
@@ -509,7 +510,9 @@ class _OrganizationSettingsDialogState
                 ),
               ),
               const SizedBox(height: 16),
-              TextField(
+              CompositedTransformTarget(
+                link: link,
+                child: TextField(
                   key: textFieldKey,
                   controller: usernameController,
                   cursorColor: AppTheme.accentColor,
@@ -549,6 +552,7 @@ class _OrganizationSettingsDialogState
                     }
                   },
                 ),
+              ),
               DropdownButtonFormField<String>(
                 initialValue: selectedRole,
                 items: ['admin', 'member'].map((role) {
@@ -645,11 +649,11 @@ class _OrganizationSettingsDialogState
 
     if (_userSuggestions.isNotEmpty) {
       children.add(
-        Positioned(
-          top: 240,
-          left: 0,
-          right: 0,
+        CompositedTransformFollower(
+          link: link,
+          offset: const Offset(0, 48),
           child: Container(
+            width: 300,
             height: 100,
             decoration: BoxDecoration(
               color: AppTheme.primaryBackground,