Improve test coverage and refactor storybook arch (#723)

* Improve test coverage and refactor storybook arch

* Fix coverage

* Fix tests

* Fix lint

* Fix lint

front/src/__stories__/App.stories.tsx

@@ -2,7 +2,6 @@ import type { Meta, StoryObj } from '@storybook/react';
 
 import { App } from '~/App';
 import { graphqlMocks } from '~/testing/graphqlMocks';
-import { mockedUserJWT } from '~/testing/mock-data/jwt';
 
 import { render } from './shared';
 
@@ -16,14 +15,6 @@ export type Story = StoryObj<typeof App>;
 
 export const Default: Story = {
   render,
-  loaders: [
-    async () => ({
-      accessTokenStored: window.localStorage.setItem(
-        'accessToken',
-        mockedUserJWT,
-      ),
-    }),
-  ],
   parameters: {
     msw: graphqlMocks,
   },