[FEAT] Added group validation.

lib/src/form/src/controller.dart

@@ -200,6 +200,40 @@ class AstromicFormController {
     return allValid;
   }
 
+  /// Automatically validates every instance of a specific [groupId].
+  ///
+  /// It looks up the [AstromicFormGroupDefinition], finds all active UUIDs in the manifest,
+  /// and triggers [validateOnly] for every field defined in the schema.
+  ///
+  /// Returns `true` if all instances are valid.
+  bool validateGroup(String groupId, {String? parentUuid}) {
+    // 1. Get the definition to know which fields exist
+    final def = _groupDefs[groupId];
+    if (def == null) {
+      throw Exception("Validation Error: Group '$groupId' is not registered.");
+    }
+
+    // 2. Get all active UUIDs for this group/parent context
+    final manifest = getManifest(groupId, parentUuid);
+    final List<String> activeUuids = manifest.value;
+
+    if (activeUuids.isEmpty) return true; // Empty groups are technically valid unless a "Min Items" rule exists
+
+    // 3. Collect every field ID for every instance
+    final List<String> idsToValidate = [];
+    for (final uuid in activeUuids) {
+      for (final fieldName in def.schema.keys) {
+        idsToValidate.add('${groupId}_${fieldName}_$uuid');
+      }
+
+      // OPTIONAL: If you want to auto-validate nested subgroups,
+      // you could recursively call validateGroup for each id in def.subGroups here.
+    }
+
+    // 4. Delegate to the core validation logic
+    return validateOnly(idsToValidate);
+  }
+
   /// Exports the data of a specific group as a list of maps, including all nested subgroups.
   List<Map<String, dynamic>> getGroupData(String groupId, {String? parentUuid}) {
     final manifest = getManifest(groupId, parentUuid);
@@ -210,8 +244,8 @@ class AstromicFormController {
       final Map<String, dynamic> row = {};
 
       for (var fieldName in def.schema.keys) {
-        final fieldId = "${groupId}_${fieldName}_$uuid";
-        row[fieldName] = get(fieldId);
+        final fieldId = '${groupId}_${fieldName}_$uuid';
+        row[fieldName] = get<dynamic>(fieldId);
       }
 
       for (var subGroupId in def.subGroups) {

lib/src/form/src/helpers/form_group_helper.dart

@@ -47,22 +47,8 @@ class AstromicGroupHandler {
   }
 
   /// Performs validation on every registered field within all instances of this specific group.
-  ///
-  /// Returns `true` if all fields pass their respective validation contracts.
   bool validate() {
-    final def = _ctrl.groupDefs[_groupId];
-    if (def == null) return true;
-
-    final activeUuids = _ids.value;
-    final List<String> idsToValidate = [];
-
-    for (var uuid in activeUuids) {
-      for (var fieldName in def.schema.keys) {
-        idsToValidate.add('${_groupId}_${fieldName}_$uuid');
-      }
-    }
-
-    return _ctrl.validateOnly(idsToValidate);
+    return _ctrl.validateGroup(_groupId, parentUuid: _parentUuid);
   }
 }