Issue #3621911: Fix the content language settings link

Kieran Cottrequested to merge
issue/canvas_translate-3621911:3621911-link-to-content into 1.0.x

Fixes the Content language settings link, which was blocked because Canvas page-extension iframes cannot open new tabs. The link now navigates within the extension frame.

Includes an end-to-end regression test, updated specification and rebuilt frontend assets.

Testing:

  • 32 kernel tests
  • 32 Vitest tests
  • TypeScript and production build
  • Chromium regression test
  • OpenSpec validation

Generated with the help of an LLM.

Closes #3621911

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