Stabilize playwright tests by making the left panel constant width (#33451)

* Move css injection to panel.ts

- Inject css on event

* Upgrade package

* Fix playwright tests

* Remove RR instead of masking it

* Fix wrong import

* Fix playwright tests

* Fix more playwright tests

* Catch error and add comment

apps/web/playwright/e2e/left-panel/room-list-panel/room-list-collapse.spec.ts

@@ -13,6 +13,7 @@ import type { Locator, Page } from "playwright-core";
 test.describe("Collapsible Room list", () => {
     test.use({
         displayName: "Alice",
+        lockLeftPanelWidth: false,
     });
 
     test.beforeEach(async ({ page, app, user }) => {