Return to recurring runs after canceling creation

[jeffspahr]

Summary

• Return users to #/recurringruns when canceling recurring-run creation launched from the all recurring-runs page.
• Add a returnTo query parameter for the recurring-runs entrypoint and validate it as a same-app path before using it.
• Keep the existing /runs fallback for new-run pages without a safe return target.

Validation

• npm --prefix frontend run test:ui -- AllRecurringRunsList.test.tsx NewRunV2.test.tsx Router.test.tsx
• npm --prefix frontend run lint
• npm --prefix frontend run typecheck
• npx --prefix frontend prettier --check frontend/src/components/Router.tsx frontend/src/components/Router.test.tsx frontend/src/lib/Buttons.ts frontend/src/pages/AllRecurringRunsList.test.tsx frontend/src/pages/NewRunV2.tsx frontend/src/pages/NewRunV2.test.tsx
• git diff --check

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[Copilot]

Pull request overview

This PR adds a returnTo query parameter to preserve navigation context when launching recurring-run creation from the recurring runs list, so that canceling creation can return the user to /recurringruns instead of always falling back to /runs.

Changes:

• Add QUERY_PARAMS.returnTo plus a getSafeReturnPath helper to validate same-app return targets.
• Populate returnTo=/recurringruns when creating a recurring run from the recurring runs list, and use it on Cancel in NewRunV2.
• Add/adjust UI tests to cover the new return-path behavior and validation helper.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
frontend/src/pages/NewRunV2.tsx	Use validated returnTo to decide where Cancel navigates.
frontend/src/pages/NewRunV2.test.tsx	Add test asserting cancel navigates to a safe returnTo path.
frontend/src/pages/AllRecurringRunsList.test.tsx	Ensure recurring-run creation includes returnTo=/recurringruns.
frontend/src/lib/Buttons.ts	Add returnTo when launching recurring-run creation from /recurringruns.
frontend/src/components/Router.tsx	Introduce QUERY_PARAMS.returnTo and getSafeReturnPath.
frontend/src/components/Router.test.tsx	Add unit test for getSafeReturnPath acceptance/rejection.

[jeffspahr]

/ok-to-test