feat: improve test & bundler (#14434)

#### PR Dependency Tree


* **PR #14434** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Introduced rspack bundler as an alternative to webpack for optimized
builds.

* **Tests & Quality**
* Added comprehensive editor semantic tests covering markdown, hotkeys,
and slash-menu operations.
* Expanded CI cross-browser testing to Chromium, Firefox, and WebKit;
improved shape-rendering tests to account for zoom.

* **Bug Fixes**
  * Corrected CSS overlay styling for development servers.
  * Fixed TypeScript typings for build tooling.

* **Other**
  * Document duplication now produces consistent "(n)" suffixes.
  * French i18n completeness increased to 100%.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

tests/kit/src/utils/load-page.ts

@@ -1,5 +1,4 @@
 import type { Page } from '@playwright/test';
-import { expect } from '@playwright/test';
 
 export let coreUrl = 'http://localhost:8080';
 
@@ -21,6 +20,7 @@ export async function confirmCreateJournal(page: Page) {
 }
 
 export async function openJournalsPage(page: Page) {
+  const { expect } = await import('@playwright/test');
   await page.getByTestId('slider-bar-journals-button').click();
   await confirmCreateJournal(page);
   await expect(