[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/pages/pui_build.spec.ts

@@ -66,7 +66,7 @@ test('Build Order - Basic Tests', async ({ browser }) => {
   await loadTab(page, 'Attachments');
   await loadTab(page, 'Notes');
   await loadTab(page, 'Incomplete Outputs');
-  await loadTab(page, 'Required Stock');
+  await loadTab(page, 'Required Parts');
   await loadTab(page, 'Allocated Stock');
 
   // Check for expected text in the table