Relay 0.25.0

TL;DR: A new activity bar down the left edge, threads you can delete, and a tidier deep review.

• The sidebar footer is now an activity bar down the window's left edge: Threads, Search, Pull requests and Schedules at the top, the Clockify timer, Usage and Settings at the bottom. The open view is marked, and Settings gets a dot while an update you put off is waiting.
• Delete a thread from its menu (it asks first).
• A deep review's card shows what it covers: the branch, commit or PR, and how many reviewers. Split reviews count their reviewers properly.
• Reviewer threads stay inside their review instead of cluttering every list, on the phone too.
• A finished thread's report shows only as its header in the lead's thread, so the lead's own answer isn't buried.
• Agents can move a thread into a worktree that already has the branch checked out.
• The editor's status line shows what the changes are compared against, and inline changes use the diff view's colours.
• Opening a changed file from a turn hides the sidebar to give the file room.
• A search that finds nothing no longer shows as a failed call, and only the failed row in a group turns red.
• The Pull requests board stays up while switching filters.
• Every page now has the chat's background.
• The Processes page is gone; the machine load still shows on the terminal's Running card.