Refactor login state management (#7158)

* Refactor login state management

- Previously relied only on presence of cookie
- Cookie may not actually be *valid*
- Inspect actual login state by looking at userState values
- Ensures better sequencing of global state API requests
- Login state is now correctly preseed across browsers

* Ignore errors for user/me/ API endpoint in playwright test

* Do not request notifications unless logged in

* Prevent duplicate licenses

* Update src/frontend/src/views/DesktopAppView.tsx

Co-authored-by: Matthias Mair <code@mjmair.com>

* Simplify checkLoginState

* Fix bug in return types

* Update playwright tests

* linting

* Remove error msg

* Use token auth for API calls

- Will (hopefully) allow us to bypass csrfmiddle request handling?

* Refetch token if not available

* Use cache for DISPLAY_FULL_NAMES setting

* Update src/frontend/tests/baseFixtures.ts

Co-authored-by: Matthias Mair <code@mjmair.com>

* PUI test updates

* Tweak doLogout function

* Revert change to baseFixtures.ts

* Cleanup

* Fix highlighted property

* Test cleanup

---------

Co-authored-by: Matthias Mair <code@mjmair.com>

src/frontend/playwright.config.ts

@@ -5,6 +5,7 @@ export default defineConfig({
   fullyParallel: true,
   timeout: 60000,
   forbidOnly: !!process.env.CI,
+  timeout: 5 * 60 * 1000,
   retries: process.env.CI ? 1 : 0,
   workers: process.env.CI ? 2 : undefined,
   reporter: process.env.CI ? [['html', { open: 'never' }], ['github']] : 'list',