Add a shortcut to archive a thread

[atimmer]

What Changed

Add a keyboard shortcut to archive a thread.

It also adds it to the Cmd+K shortcut menu. I can remove that if desired.

Why

The Cmd+1, Cmd+2, etc system is really tight for quickly working on different threads. But when you have some stale threads around you have to use Cmd+1/Cmd+5. By adding a keyboard shortcut for archiving, you don't have to take your hand off the keyboard.

UI Changes

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

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Note

Low Risk
Low risk: adds a new keybinding command and wires it to existing archiveThread behavior, with minimal impact outside keyboard handling and command palette actions.

Overview
Adds a new thread.archiveCurrent keybinding command, including a default shortcut (mod+shift+a) and contract support so it can be configured/validated.

Wires the command into the chat route’s global keyboard handler to archive the currently routed thread via useThreadActions().archiveThread, and surfaces the same action in the command palette (with error toasts on failure).

^{Reviewed by Cursor Bugbot for commit e8f77a4. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add keyboard shortcut and command palette action to archive the current thread

• Adds a thread.archiveCurrent command bound to mod+shift+a (when terminal is not focused) in keybindings.ts.
• Handles the shortcut in _chat.tsx via ChatRouteGlobalShortcuts, calling archiveThread on the active route thread and showing an error toast on failure.
• Adds an 'Archive current thread' entry to the Command Palette in CommandPalette.tsx, visible only when a thread is active.
• Also fixes a fall-through bug in the chat.new shortcut handler by adding an early return after invocation.

^{Macroscope summarized e8f77a4.}

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[macroscopeapp]

Approvability

Verdict: Approved

This PR adds a keyboard shortcut (Mod+Shift+A) and command palette action to archive the current thread, wiring up the existing archiveThread function with no new business logic. The changes are additive, follow existing patterns, and have no runtime behavior impact beyond the new UI trigger.

^{You can customize Macroscope's approvability policy. Learn more.}