ThePalaceProject / web-patron / 31342264941

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Clean up async event warnings in LanguageSelector tests (#180)

## Description

Silences a bunch of React `act(...)` warnings that the language selector
tests printed on every test run. The tests now wait for the language
selector to finish settling before making assertions, instead of
checking it the instant it renders.

No test coverage or behavior changed, and no application code was
touched.

## Motivation and Context

The dropdown library used by the language selector finishes some of its
setup work in a microtask just after the component's first render,
rather than during it. The tests were synchronous and asserting
immediately, so that extra bit of work landed after the test had already
moved on. That made React unhappy, causing it to warn.

Nothing was actually broken, but the warnings were pumping a lot of
stack traces into the test output, making it harder to see real failures
and making the logs harder to read and understand at glance.

## How Has This Been Tested?

- `npm run test:ci` — all tests pass across both suites with zero
`act(...)` warnings remaining in the output.

## Checklist:

- [x] I have updated the documentation accordingly (inline).
- [x] All new and existing tests passed.

296 of 393 branches covered (75.32%)

Branch coverage included in aggregate %.

503 of 584 relevant lines covered (86.13%)

29.74 hits per line