Fix test flake in pages.spec.ts

[zackkrida]

Description

Fixes flake in pages.spec.ts by waiting for the route navigation that occurrs after using the locale chooser. This prevents a race condition where the search input would be populated before the route change, and then the route change would reset the search query

Testing Instructions

All CI should pass.

Additionally, you can build and start the frontend with ov j frontend/run build && ov j frontend/run start, then run Playwright interactively and locally with just frontend/run test:playwright:local -- --ui pages.spec.ts. Press the green play arrow next to the "layout color is set correctly" test to run it.

The test should pass or make it through to the end and fail with a small screenshot difference in text rendering based on differences between your local system and the CI 😅

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (ov just catalog/generate-docs media-props
  for the catalog or ov just api/generate-docs for the API) where applicable.

Developer Certificate of Origin

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[AetherUnbound]

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