feat: AI - improve writing (#2257)

* feat: AI - Improve writing

* fix: new line in result

* formatted code

frontend/appflowy_flutter/assets/translations/en.json

@@ -363,6 +363,7 @@
       "smartEditFixSpelling": "Fix spelling",
       "warning": "⚠️ AI responses can be inaccurate or misleading.",
       "smartEditSummarize": "Summarize",
+      "smartEditImproveWriting":"Improve Writing",
       "smartEditCouldNotFetchResult": "Could not fetch result from OpenAI",
       "smartEditCouldNotFetchKey": "Could not fetch OpenAI key",
       "smartEditDisabled": "Connect OpenAI in Settings",

frontend/appflowy_flutter/lib/plugins/document/presentation/plugins/openai/widgets/smart_edit_action.dart

@@ -5,7 +5,8 @@ import 'package:easy_localization/easy_localization.dart';
 
 enum SmartEditAction {
   summarize,
-  fixSpelling;
+  fixSpelling,
+  improveWriting;
 
   String get toInstruction {
     switch (this) {
@@ -13,6 +14,8 @@ enum SmartEditAction {
         return 'Tl;dr';
       case SmartEditAction.fixSpelling:
         return 'Correct this to standard English:';
+      case SmartEditAction.improveWriting:
+        return 'Rewrite this in your own words:';
     }
   }
 
@@ -22,6 +25,8 @@ enum SmartEditAction {
         return '$input\n\nTl;dr';
       case SmartEditAction.fixSpelling:
         return 'Correct this to standard English:\n\n$input';
+      case SmartEditAction.improveWriting:
+        return 'Rewrite this:\n\n$input';
     }
   }
 
@@ -31,6 +36,8 @@ enum SmartEditAction {
         return SmartEditAction.summarize;
       case 1:
         return SmartEditAction.fixSpelling;
+      case 2:
+        return SmartEditAction.improveWriting;
     }
     return SmartEditAction.fixSpelling;
   }
@@ -41,6 +48,8 @@ enum SmartEditAction {
         return LocaleKeys.document_plugins_smartEditSummarize.tr();
       case SmartEditAction.fixSpelling:
         return LocaleKeys.document_plugins_smartEditFixSpelling.tr();
+      case SmartEditAction.improveWriting:
+        return LocaleKeys.document_plugins_smartEditImproveWriting.tr();
     }
   }
 }

frontend/appflowy_flutter/lib/plugins/document/presentation/plugins/openai/widgets/smart_edit_node_widget.dart

@@ -356,7 +356,9 @@ class _SmartEditInputState extends State<_SmartEditInput> {
           },
           onProcess: (response) async {
             setState(() {
-              this.result += response.choices.first.text;
+              if (response.choices.first.text != '\n') {
+                this.result += response.choices.first.text;
+              }
             });
           },
           onEnd: () async {