Add AI prompts

This part will be highly reworked soon because :
- prompts will come from a remote JSON file
- menu will be build depending of prompts that will contains translations

I think it should also be moved in another module later.

scribe/lib/scribe/ai/domain/constants/ai_prompts.dart

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+import '../../presentation/model/ai_action.dart';
+import '../../presentation/model/ai_scribe_menu_action.dart';
+
+// TODO
+// In a near future, prompts will be loaded from a remote source
+class AIPrompts {
+  static String buildPrompt(AIAction action, String? text) {
+    return switch (action) {
+      PredefinedAction(action: final menuAction) => buildPredefinedPrompt(menuAction, text ?? ''),
+      CustomPromptAction(prompt: final customPrompt) => buildCustomPrompt(customPrompt, text),
+    };
+  }
+
+  static String buildPredefinedPrompt(AIScribeMenuAction action, String text) {
+    switch (action) {
+      case AIScribeMenuAction.correctGrammar:
+        return correctGrammar(text);
+      case AIScribeMenuAction.improveMakeShorter:
+        return improveMakeShorter(text);
+      case AIScribeMenuAction.improveExpandContext:
+        return improveExpandContext(text);
+      case AIScribeMenuAction.improveEmojify:
+        return improveEmojify(text);
+      case AIScribeMenuAction.improveTransformToBullets:
+        return improveTransformToBullets(text);
+      case AIScribeMenuAction.changeToneProfessional:
+        return changeToneTo(text, 'professional');
+      case AIScribeMenuAction.changeToneCasual:
+        return changeToneTo(text, 'casual');
+      case AIScribeMenuAction.changeTonePolite:
+        return changeToneTo(text, 'polite');
+      case AIScribeMenuAction.translateFrench:
+        return translateTo(text, 'French');
+      case AIScribeMenuAction.translateEnglish:
+        return translateTo(text, 'English');
+      case AIScribeMenuAction.translateRussian:
+        return translateTo(text, 'Russian');
+      case AIScribeMenuAction.translateVietnamese:
+        return translateTo(text, 'Vietnamese');
+    }
+  }
+
+  static String improveMakeShorter(String text) {
+    return 'Make the following text shorter and more concise. Output only the result. Preserve input formatting. Text:\n\n$text';
+  }
+
+  static String improveExpandContext(String text) {
+    return 'Expand the context of the following text to make it more detailed and comprehensive. Output only the result. Preserve input formatting. Text:\n\n$text';
+  }
+
+  static String improveEmojify(String text) {
+    return 'Add appropriate emojis to the following text to make it more expressive. Output only the result. Preserve input formatting. Text:\n\n$text';
+  }
+
+  static String improveTransformToBullets(String text) {
+    return 'Transform the following text into a bulleted list format. Output only the result. Preserve input formatting. Text:\n\n$text';
+  }
+
+  static String correctGrammar(String text) {
+    return 'Correct grammar of the following text. Output only the result. Preserve input formatting. Text:\n\n$text';
+  }
+
+  static String changeToneTo(String text, String tone) {
+    return 'Change the tone of the following text to be more $tone. Output only the result. Preserve input formatting. Text:\n\n$text';
+  }
+
+  static String translateTo(String text, String language) {
+    return 'Translate the following text to $language. Output only the result. Preserve input formatting. Text:\n\n$text';
+  }
+
+  static String buildCustomPrompt(String customPrompt, String? text) {
+    if (text == null) {
+      return customPrompt;
+    }
+
+    return '$customPrompt\n\nText:\n\n$text';
+  }
+}

scribe/lib/scribe/ai/presentation/model/ai_action.dart

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+import 'ai_scribe_menu_action.dart';
+
+sealed class AIAction {
+  const AIAction();
+
+  String get label;
+}
+
+class PredefinedAction extends AIAction {
+  final AIScribeMenuAction action;
+
+  const PredefinedAction(this.action);
+
+  @override
+  String get label => action.fullLabel;
+}
+
+class CustomPromptAction extends AIAction {
+  final String prompt;
+
+  const CustomPromptAction(this.prompt);
+
+  @override
+  String get label => 'Help me write';
+}

scribe/lib/scribe/ai/presentation/model/ai_scribe_menu_action.dart

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+enum AIScribeMenuAction {
+  correctGrammar,
+  improveMakeShorter,
+  improveExpandContext,
+  improveEmojify,
+  improveTransformToBullets,
+  changeToneProfessional,
+  changeToneCasual,
+  changeTonePolite,
+  translateFrench,
+  translateEnglish,
+  translateRussian,
+  translateVietnamese;
+
+  String get label {
+    switch (this) {
+      case AIScribeMenuAction.correctGrammar:
+        return 'Correct grammar';
+      case AIScribeMenuAction.improveMakeShorter:
+        return 'Make it shorter';
+      case AIScribeMenuAction.improveExpandContext:
+        return 'Expand context';
+      case AIScribeMenuAction.improveEmojify:
+        return 'Emojify';
+      case AIScribeMenuAction.improveTransformToBullets:
+        return 'Transform to bullets';
+      case AIScribeMenuAction.changeToneProfessional:
+        return 'More professional';
+      case AIScribeMenuAction.changeToneCasual:
+        return 'More casual';
+      case AIScribeMenuAction.changeTonePolite:
+        return 'More polite';
+      case AIScribeMenuAction.translateFrench:
+        return 'French';
+      case AIScribeMenuAction.translateEnglish:
+        return 'English';
+      case AIScribeMenuAction.translateRussian:
+        return 'Russian';
+      case AIScribeMenuAction.translateVietnamese:
+        return 'Vietnamese';
+    }
+  }
+
+  AIScribeMenuCategory get category {
+    switch (this) {
+      case AIScribeMenuAction.correctGrammar:
+        return AIScribeMenuCategory.correctGrammar;
+      case AIScribeMenuAction.improveMakeShorter:
+      case AIScribeMenuAction.improveExpandContext:
+      case AIScribeMenuAction.improveEmojify:
+      case AIScribeMenuAction.improveTransformToBullets:
+        return AIScribeMenuCategory.improve;
+      case AIScribeMenuAction.changeToneProfessional:
+      case AIScribeMenuAction.changeToneCasual:
+      case AIScribeMenuAction.changeTonePolite:
+        return AIScribeMenuCategory.changeTone;
+      case AIScribeMenuAction.translateFrench:
+      case AIScribeMenuAction.translateEnglish:
+      case AIScribeMenuAction.translateRussian:
+      case AIScribeMenuAction.translateVietnamese:
+        return AIScribeMenuCategory.translate;
+    }
+  }
+
+  String get fullLabel {
+    final categoryLabel = category.label;
+    if (category.hasSubmenu) {
+      return '$categoryLabel > $label';
+    } else {
+      return label;
+    }
+  }
+}
+
+enum AIScribeMenuCategory {
+  correctGrammar,
+  improve,
+  changeTone,
+  translate;
+
+  String get label {
+    switch (this) {
+      case AIScribeMenuCategory.correctGrammar:
+        return 'Correct grammar';
+      case AIScribeMenuCategory.improve:
+        return 'Improve';
+      case AIScribeMenuCategory.changeTone:
+        return 'Change tone';
+      case AIScribeMenuCategory.translate:
+        return 'Translate';
+    }
+  }
+
+  List<AIScribeMenuAction> get actions {
+    switch (this) {
+      case AIScribeMenuCategory.correctGrammar:
+        return [AIScribeMenuAction.correctGrammar];
+      case AIScribeMenuCategory.improve:
+        return [
+          AIScribeMenuAction.improveMakeShorter,
+          AIScribeMenuAction.improveExpandContext,
+          AIScribeMenuAction.improveEmojify,
+          AIScribeMenuAction.improveTransformToBullets,
+        ];
+      case AIScribeMenuCategory.changeTone:
+        return [
+          AIScribeMenuAction.changeToneProfessional,
+          AIScribeMenuAction.changeToneCasual,
+          AIScribeMenuAction.changeTonePolite,
+        ];
+      case AIScribeMenuCategory.translate:
+        return [
+          AIScribeMenuAction.translateFrench,
+          AIScribeMenuAction.translateEnglish,
+          AIScribeMenuAction.translateRussian,
+          AIScribeMenuAction.translateVietnamese,
+        ];
+    }
+  }
+
+  bool get hasSubmenu {
+    return actions.length > 1;
+  }
+}