Add character deletion functionality with confirmation workflow

- Added `handleDeleteCharacter` method to handle character deletion with confirmation prompts.
- Updated `CharacterComponent` and `CharacterDetail` to include delete button and related logic.
- Localized new strings for character deletion (e.g., confirmation prompts, success/error messages).
- Enhanced database repository methods (`deleteCharacter`) to handle character deletion securely.
- Improved synchronization workflows to accommodate character deletion.

electron/database/repositories/character.repository.ts

@@ -198,6 +198,32 @@ export default class CharacterRepo {
         }
     }
 
+    /**
+     * Deletes a character and all its related data (attributes) from the database.
+     * @param userId - The unique identifier of the user
+     * @param characterId - The unique identifier of the character to delete
+     * @param lang - The language for error messages ('fr' or 'en')
+     * @returns True if the deletion was successful, false otherwise
+     */
+    static deleteCharacter(userId: string, characterId: string, lang: 'fr' | 'en' = 'fr'): boolean {
+        try {
+            const db: Database = System.getDb();
+            const deleteAttributesQuery: string = 'DELETE FROM `book_characters_attributes` WHERE `character_id`=? AND `user_id`=?';
+            db.run(deleteAttributesQuery, [characterId, userId]);
+            const deleteCharacterQuery: string = 'DELETE FROM `book_characters` WHERE `character_id`=? AND `user_id`=?';
+            const result: RunResult = db.run(deleteCharacterQuery, [characterId, userId]);
+            return result.changes > 0;
+        } catch (error: unknown) {
+            if (error instanceof Error) {
+                console.error(`DB Error: ${error.message}`);
+                throw new Error(lang === 'fr' ? `Impossible de supprimer le personnage.` : `Unable to delete character.`);
+            } else {
+                console.error("An unknown error occurred.");
+                throw new Error(lang === 'fr' ? "Une erreur inconnue s'est produite." : "An unknown error occurred.");
+            }
+        }
+    }
+
     /**
      * Deletes a character attribute from the database.
      * @param userId - The unique identifier of the user