feat: add input validation to search, update agent card layout, and extend ProfileFormField with input constraints

lib/features/agents/presentation/screens/agent_detail_screen.dart

@@ -1598,9 +1598,13 @@ class _SpecializationCardWidgetState extends State<_SpecializationCardWidget> {
         : widget.card.values.take(_initialCount).toList();
     final hasMore = widget.card.values.length > _initialCount;
 
+    // Consistent minimum height across all cards so the layout stays uniform
+    // regardless of how many values each card has (icon + title + up to 3
+    // rows + show more button fits comfortably).
     return Container(
       width: 298,
-      padding: const EdgeInsets.symmetric(vertical: 16),
+      constraints: const BoxConstraints(minHeight: 240),
+      padding: const EdgeInsets.symmetric(vertical: 16, horizontal: 12),
       decoration: BoxDecoration(
         color: Colors.white,
         borderRadius: BorderRadius.circular(15),
@@ -1611,11 +1615,13 @@ class _SpecializationCardWidgetState extends State<_SpecializationCardWidget> {
       ),
       child: Column(
         mainAxisSize: MainAxisSize.min,
+        mainAxisAlignment: MainAxisAlignment.start,
         children: [
           Icon(_icon, size: 32, color: AppColors.accentOrange),
           const SizedBox(height: 8),
           Text(
             widget.card.name,
+            textAlign: TextAlign.center,
             style: const TextStyle(
               fontFamily: 'Fractul',
               fontSize: 14,