Refactor IPC handlers to enforce consistent return types and enhance type definitions

- Update return types for IPC handlers in `character.ipc.ts`, `chapter.ipc.ts`, and `location.ipc.ts` for stricter type safety.
- Introduce new type definitions for better structure and clarity.
- Remove redundant console logs and unnecessary comments for cleaner code.

electron/ipc/character.ipc.ts

@@ -47,8 +47,8 @@ ipcMain.handle('db:character:attribute:add', createHandler<AddAttributeData, str
 );
 
 // DELETE /character/attribute/delete - Delete character attribute
-ipcMain.handle('db:character:attribute:delete', createHandler<string, any>(
-        function(userId: string, attributeId: string, lang: 'fr' | 'en') {
+ipcMain.handle('db:character:attribute:delete', createHandler<string, boolean>(
+        function(userId: string, attributeId: string, lang: 'fr' | 'en'): boolean {
             return Character.deleteAttribute(userId, attributeId, lang);
         }
     )
@@ -60,6 +60,4 @@ ipcMain.handle('db:character:update', createHandler<CharacterPropsPost, boolean>
             return Character.updateCharacter(userId, character, lang);
         }
     )
-);
-
-console.log('[IPC] Character handlers registered');
+);