ENG-1701: basic-group-management-ui

[maparent]

https://linear.app/discourse-graphs/issue/ENG-1701/basic-group-management-ui

https://www.loom.com/share/2754a7979de04995baa775da5b23c898

[linear-code]

ENG-1701

[supabase]

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[graphite-app]

PR size/scope check

This PR is over our review-size guideline.

• Recommended: ~200 lines changed
• Acceptable limit: up to 400 lines when well-scoped/self-contained
• Preferred file count: fewer than 5 files

Please split this into smaller PRs unless there is a clear reason the changes need to land together.

If keeping it as one PR, please add a brief justification covering:

• What single problem this PR solves
• Why the files/changes are coupled

[maparent]

Interesting anomaly: I had lint errors from the GitHub task of the form

Warning:   38:20  warning  Promise-returning function provided to attribute where a void return was expected  @typescript-eslint/no-misused-promises```
(Because I was using async functions directly as actions instead of wrapping them with a void.)
But those lint errors did not show up in a local `pnpm run lint`. Are the settings different in any way?