Add AI text interactor

scribe/lib/scribe/ai/domain/usecases/generate_ai_text_interactor.dart

@@ -0,0 +1,27 @@
+import 'package:core/core.dart';
+import 'package:dartz/dartz.dart';
+import '../constants/ai_prompts.dart';
+import '../repository/ai_scribe_repository.dart';
+import '../state/generate_ai_text_state.dart';
+import '../../presentation/model/ai_action.dart';
+
+class GenerateAITextInteractor {
+  final AIScribeRepository _repository;
+
+  GenerateAITextInteractor(this._repository);
+
+  Future<Either<Failure, Success>> execute(
+    AIAction action,
+    String? selectedText,
+  ) async {
+    try {
+      final prompt = AIPrompts.buildPrompt(action, selectedText);
+
+      final response = await _repository.generateText(prompt);
+
+      return Right(GenerateAITextSuccess(response));
+    } catch (e) {
+      return Left(GenerateAITextFailure(e));
+    }
+  }
+}