Fix panic in pane.rs

Remove stable guard for copilot

Get copilot ready to ship

Update copilot styles

Fix 'invalid insertion' panic when following

Clean up completion tasks, even if they fail or return no results

Send buffer operations in batches to reduce latency

Always bump worktree's scan_id when refreshing an entry

Restructure background scanner to handle refresh requests even while scanning directories

Add vim mode metric

Avoid interpolating Copilot suggestion if cursor excerpt differs

Add tab context menu

Flip screen sharing icon states

Restructure randomized integration test to allow editing and replaying a plan, fix discovered bugs

Previously, we could end up with a situation where the host did not
see an operation but a guest that didn't have that buffer open would. When
such guest would finally open the buffer, they would apply the operation
without however sending it to the host. The guest wouldn't bother resyncing
it because it wasn't part of its open buffers.

co-authored-by: Antonio Scandurra <antonio@zed.dev>

Update `Ayu` Theme Family

Previously, if the client was disconnected while the initial worktree
state was being sent, it would not see the remaining state after reconnecting.
This was due to `scan_id` and `completed_scan_id` both being initialized to
`0`, so the client would ask for updates since `0` and get nothing.

This commit changes the worktree to initialize `scan_id` to `1` and
`completed_scan_id` to `0`, so that we get the full worktree again on reconnect.

Previously, we would only cancel pending calls when the room became
empty.