feat(web): add Copy Thread ID to the sidebar and chat header thread context menu

[UtkarshUsername]

What Changed

Adds the 'Copy Thread ID' action to Sidebar V2's and chat header's thread context menus.

Why

The original sidebar already had it. It is helpful in diagnosing issues with threads.

UI Changes

Before:

After:

Checklist

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

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Note

Low Risk
Clipboard-only UI with no server or auth changes; behavior mirrors existing copy-path/copy-branch actions.

Overview
Adds Copy thread ID to the shared per-thread action menu (buildThreadActionMenuItems), so it appears in Sidebar V2 right-click menus and the chat header thread menu alongside copy path/branch.

Choosing the action copies thread.id via useCopyToClipboard in both Sidebar.tsx and useThreadActionMenu, with success toasts showing the ID and error toasts on failure. Menu tests expect the new item even when lifecycle capabilities are disabled.

^{Reviewed by Cursor Bugbot for commit 9f979db. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add 'Copy Thread ID' action to thread context menus in Sidebar V2 and chat header

Adds a new 'Copy Thread ID' menu item to buildThreadActionMenuItems unconditionally, making it appear in all per-thread action menus. Both the Sidebar and useThreadActionMenu hook handle the copy-thread-id action by writing the thread ID to the clipboard and showing a success or error toast.

^{Macroscope summarized 9f979db.}

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[macroscopeapp]

Approvability

Verdict: Approved fb6d745

Simple additive feature that adds a 'Copy Thread ID' context menu option. Follows existing copy-path pattern exactly, uses existing infrastructure (useCopyToClipboard, toastManager), and includes updated tests. No runtime behavior changes beyond the new menu action.

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Dismissing prior approval to re-evaluate 6f9b1b0

Dismissing prior approval to re-evaluate fb6d745