feat(loops): Clean up the loop wizard

[charlesvien]

Problem

The create/edit loop wizard was cramped and confusing. Dropdowns were tiny, "Add trigger" always inserted a schedule you then had to re-type via a small select, trigger cards blended into the modal background, and the Context, Repository and Notifications sections didn't explain what they are, where output goes or how access works.

Changes

• "Add trigger" is now a type picker menu (Schedule, GitHub event, API) with a description per type. Trigger cards get a header (icon, type, subtitle, enable switch, delete), labeled fields, specific inline validation, a darker background than the modal and an explicit empty state.
• GitHub event checkboxes are relabeled with a description of what fires them, matching the backend's action handling (any action on the subscribed event).
• Selects across the wizard go from 24px to 32px with 13px text via a new opt-in size prop on SettingsOptionSelect and TimezonePicker, plus wiring up the previously dead size prop on GitHubRepoPicker. Existing call sites keep the old size.
• Clearer copy: Context explains it's a channel from the sidebar (and the whole section hides when the channels alpha is off, unless the loop is already attached), Repository becomes "Base repository", Notifications state where each channel delivers and that full output lives on the loop page.

How did you test this?

Drove the real Electron app over CDP through all four wizard steps: trigger type menu, all three card types, inline validation, empty state, and the channels toggle off/on hiding Context on both Options and Review. Ran pnpm --filter @posthog/ui typecheck, Biome lint on changed files and the full @posthog/ui Vitest suite (1977 passing).

Automatic notifications

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

[charlesvien]

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

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[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit 8d78a27.}

[greptile-apps]

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
packages/ui/src/features/loops/components/LoopTriggerEditor.tsx:116-129
**Hand-Rolled Empty State**

The new no-trigger state recreates the shared empty-state layout with a centered `Flex`. The UI guide requires collection placeholders to use the Quill `Empty` components, so this state will miss shared accessibility and styling updates.

_{Reviews (1): Last reviewed commit: "clean up loops wizard" | Re-trigger Greptile}

[trunk-io]

😎 This pull request was merged.

[github-actions]

Pure UI/UX rework of the loop wizard (styling, copy, a new trigger-type menu, size prop plumbing) with no schema, API, auth, billing, or CI surface touched; the sole reviewer comment about a hand-rolled empty state was addressed (the diff now uses Quill's Empty components) and shows resolved with a bot 👍.

• Author wrote 94% of the modified lines and has 19 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	✓	723L, 12F substantive — within ceiling
tier	✓	T1-agent / T1d-complex (723L, 12F, single-area, feat)
stamphog 2.0.0b3		.stamphog/policy.yml @ 9001b17 · reviewed head 8d78a27