feat(web): add Copy Thread ID to Sidebar V2 thread context menu

[UtkarshUsername]

What Changed

Adds the 'Copy Thread ID' action to Sidebar V2's thread context menu.

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
UI-only clipboard copy with existing toast patterns; no auth, data, or server behavior changes.

Overview
Adds Copy thread ID to the shared thread action menu so Sidebar V2 and the chat header match the legacy sidebar for support/debugging.

The new copy-thread-id item is defined in buildThreadActionMenuItems (with the other copy actions, before delete). SidebarV2 and useThreadActionMenu wire it through useCopyToClipboard and show success/error toasts with the ID in the description. Unit tests expect the item even when lifecycle capabilities are off.

^{Reviewed by Cursor Bugbot for commit f51734e. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add 'Copy Thread ID' option to thread context menus in SidebarV2 and chat header

Adds a copy-thread-id action to buildThreadActionMenuItems in threadActionMenu.logic.ts, placing it after existing copy actions and before the delete action. Both SidebarV2.tsx and useThreadActionMenu.ts handle the new action by copying the thread ID to the clipboard and showing a success or error toast.

^{Macroscope summarized f51734e.}

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[macroscopeapp]

Approvability

Verdict: Approved 6f9b1b0

Simple additive UI feature that adds a 'Copy Thread ID' menu item to the thread context menu. The implementation follows existing patterns for similar copy operations already in the codebase, uses established hooks, and includes appropriate test updates.

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Dismissing prior approval to re-evaluate 6f9b1b0