Refactor profile tab layout: replace SingleChildScrollView with Stack for improved logout button positioning and enhance avatar display

b0esche_cloud/lib/widgets/account_settings_dialog.dart

@@ -326,7 +326,9 @@ class _AccountSettingsDialogState extends State<AccountSettingsDialog> {
   }
 
   Widget _buildProfileTab() {
-    return SingleChildScrollView(
+    return Stack(
+      children: [
+        SingleChildScrollView(
           child: Column(
             crossAxisAlignment: CrossAxisAlignment.start,
             children: [
@@ -360,7 +362,10 @@ class _AccountSettingsDialogState extends State<AccountSettingsDialog> {
                     const SizedBox(height: 8),
                     Text(
                       'Tap to change avatar',
-                  style: TextStyle(color: AppTheme.secondaryText, fontSize: 12),
+                      style: TextStyle(
+                        color: AppTheme.secondaryText,
+                        fontSize: 12,
+                      ),
                     ),
                   ],
                 ),
@@ -408,19 +413,24 @@ class _AccountSettingsDialogState extends State<AccountSettingsDialog> {
                   ),
                 ),
               ),
-          const SizedBox(height: 24),
-
-          // Logout Button
-          Center(
+              const SizedBox(height: 80), // Space for logout button
+            ],
+          ),
+        ),
+        // Logout Button in bottom right corner of profile tab
+        Positioned(
+          bottom: 16,
+          right: 16,
           child: IconButton(
             onPressed: _logout,
             icon: Icon(Icons.logout, color: AppTheme.errorColor),
             tooltip: 'Logout',
             iconSize: 28,
+            splashColor: Colors.transparent,
+            highlightColor: Colors.transparent,
           ),
         ),
       ],
-      ),
     );
   }