feat(web): show remote environment glyph for non-primary worktree groups

[connorch]

What Changed

Adds a small cloud glyph (with tooltip naming the machine) next to sidebar worktree groups that live on a non-primary environment. The local checkout and any groups on the primary environment stay unmarked.

Why

The sidebar previously gave no visual signal that a worktree group was running on a different machine, making it easy to mistake a remote checkout for the local one.

UI Changes

Adds a CloudIcon glyph next to the branch/checkout label for remote groups, with a tooltip showing the environment label.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

[cursor]

Bugbot is not enabled for your account, so this pull request was not reviewed.

Enable Bugbot in the Cursor dashboard to get automatic reviews on future PRs.