Refactor the Review Center component to improve layout, accessibility,
and user flow. Add a SelectMenu integration picker and reorganize state
tabs and search into a cleaner toolbar. Bind the detail panel, close it
on outside pointer events, and introduce richer merge/conflict UI with a
local-resolution flow plus comment formatting helpers and action tweaks.
- Add SelectMenu for integration selection and cleaner toolbar layout
- Bind detail panel, handle outside-click closing, and focus helpers
- Improve conflict/merge presentation and action menu behaviors