[UI] Build order visual enhancements (#9931)

* Adjust UI wording

- Separation between "items" and "stock"

* Add info panel if build order has no required items

* Fixes for playwright testing

- Ensure cookies are completely cleaned  between sessions
- Fix base URL based on vite command
- Fix samesite cookie mode
- Prevent /static/ files being served by web server on :8000

* Remove gunicorn option

* Fix unit test

* Readjust base URL

* Simplify doCachedLogin

* Adjust text

* Ensure translations are extracted

- Otherwise, playwright will not find the right strings...

* Make admin test more reliable

* Remove asynciness

* Fix <AttachmentLink>

- Allow null "attachment" value

* Better implementation

* Cleanup

src/frontend/tests/helpers.ts

@@ -105,6 +105,8 @@ export const loadTab = async (page, tabName) => {
     .getByLabel(/panel-tabs-/)
     .getByRole('tab', { name: tabName })
     .click();
+
+  await page.waitForLoadState('networkidle');
 };
 
 // Activate "table" view in certain contexts