## Summary
- virtualize the unfiltered channel member roster instead of eagerly
mounting every member card
- retain the existing member search/add flow and archived-member
behavior
- cover a 500-member roster, bounded mounted rows, and scrolling to the
final member in E2E
## Cause
The members sidebar rendered every active member card at once. On large
channels this mounted hundreds or thousands of avatars, profile/presence
consumers, menus, and DOM rows, blocking the renderer even though
fetching the roster itself is fast.
## Testing
- `pnpm typecheck`
- `pnpm exec biome check src/features/channels/ui/MembersSidebar.tsx
tests/e2e/channels.spec.ts`
- `pnpm build:e2e`
- `pnpm exec playwright test tests/e2e/channels.spec.ts --grep 'members
sidebar (virtualizes large channel rosters|can invite relay-authorized
agents|can invite and remove managed agents|collapses same-persona
managed agents)'` (4 passed)
- pre-push: `desktop-check`, full `desktop-test` (4,371 passed),
branch-skew
Implemented by Carl on Wes's behalf.
Signed-off-by: Wes <wesbillman@users.noreply.github.com>
Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@buzz.block.builderlab.xyz>
