feat: Add greeting message to unit list screen

Co-authored-by: aider (openrouter/deepseek/deepseek-r1:free) <aider@aider.chat>

lib/ai/unit_list.dart

@@ -110,6 +110,16 @@ class _UnitListState extends State<UnitList> {
               },
             ),
           ),
+          Padding(
+            padding: const EdgeInsets.all(16.0),
+            child: Text('hello Informáticos',
+              style: TextStyle(
+                fontSize: 18,
+                color: Theme.of(context).colorScheme.primary,
+                fontWeight: FontWeight.bold,
+              ),
+            ),
+          ),
         ],
       ),
     );