Long-press (touch) / right-click (desktop) on a finalized message now opens a context menu anchored to the bubble: Copy / Select messages / Delete. The multi-select toolbar gains a Copy button that joins the selected messages in display order. Copies raw markdown so formatting survives pasting into other markdown apps; blank text is a no-op. Cancelling a menu-opened delete confirm clears the staged selection so the bubble doesn't stay highlighted.