Feature request: add "Copy selection" to right-click menu

The right-click context menu on assistant messages in the desktop app currently offers:

• Copy message — copies the entire message, not the selection
• Copy as Markdown — same, entire message
• Attach selection as context — attaches the selection (different action)
• Pin as chapter — unrelated to copying

There's no way to copy just the highlighted portion of a message. Standard browser/OS behavior would copy the selection on right-click → Copy, and that option is missing here.

Request: Add a "Copy selection" option to the right-click menu that copies only the highlighted text to the clipboard. Ideally it should appear at the top of the menu when a selection exists.

Environment:

• Claude Code (desktop app)
• Windows 11