feat(loops): Add stop button to loop run rows

[charlesvien]

Problem

An in-progress loop run can only be stopped by opening its task detail page. The loop detail page shows run history and lets you view a run, but there is no way to stop a run or shut down its sandbox from there.

Changes

Active cloud runs (queued or in progress) in the run history list now show a red "Stop run" button to the left of "View run". It reuses the sessions StopCloudRunDialog, so stopping goes through sessionService.stopCloudRun with the run's task and run ids, ends the cloud session and shuts down its sandbox. On success the runs list refetches immediately instead of waiting for the 15s poll. Terminal, local-environment and not-started runs show no button.

How did you test this?

pnpm --filter @posthog/ui typecheck and Biome lint on the loops feature, both clean. Not exercised against a live in-progress loop run.

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

[trunk-io]

😎 This pull request was merged.

[charlesvien]

• feat(loops): Clean up the loop wizard #3739
• feat(loops): Add stop button to loop run rows #3738 👈 (View in Graphite)
• main

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[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit ac84f00.}

[greptile-apps]

_{Reviews (1): Last reviewed commit: "add stop button to loop run rows" | Re-trigger Greptile}

[github-actions]

Contained UI feature that wires an existing stop-run dialog and service into the loop run list; no auth, billing, migration, dependency, or CI surface touched, and the author has strong recent familiarity with these exact files.

• Author wrote 100% of the modified lines and has 2 merged PRs in these paths (familiarity STRONG).
• 👍 on the PR from greptile-apps[bot].

Gate mechanics and policy version

Gate		Result
prerequisites	✓	all clear
deny-list	✓	no deny categories matched
size	✓	72L, 2F substantive — within ceiling
tier	✓	T1-agent / T1b-small (72L, 2F, single-area, feat)
stamphog 2.0.0b3		.stamphog/policy.yml @ 636a8d6 · reviewed head ac84f00