[WRONG BRANCH] test(gui): verify feature navigation target

[luvs01]

Motivation

• The feature-gated row test was vacuous because it searched the whole row for .link-btn and matched an unrelated layer-name button, so it failed to guard the Open Features navigation affordance.

Description

• Tighten the test in gui/tests/codex-set-prompt-layers.test.tsx to target the feature-note control (.codex-set-prompt__note .link-btn), click it with act(...), and assert the hash becomes #integrations/codex; the test name was updated to reflect routing verification.

Testing

• Ran the focused test with cd gui && bun test tests/codex-set-prompt-layers.test.tsx and it passed (15 tests in that file).
• Ran cd gui && bun run lint and cd gui && bun run build, both succeeded for the GUI; a full cd gui && bun test tests run exercised the suite but encountered unrelated environment failures (unavailable Bun/Node APIs and fake-timer helpers) that caused other tests to fail, unrelated to this test-only change.

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Codex Task

[github-actions]

✅ Deterministic PR hygiene checks passed.

[coderabbitai]

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[github-actions]

⏳ DRAFT

• wrong target branch (main); retarget to dev. UI screenshot required.

What to do

• Retarget this PR to dev — all contributions go to dev.
• Add a screenshot of the UI change to the PR description.

Its title has been prefixed with [WRONG BRANCH].
This pull request was already a draft. Its draft status will be preserved after every issue above is resolved.