Text selection overlay blocks copying: no copy button, Ctrl+Shift+C broken, dismissing loses selection

Description

After a recent Claude Code update, a new text selection overlay/tooltip appears at the bottom of the chat UI whenever text is selected with the mouse. This overlay completely breaks the ability to copy text:

1. The overlay has no copy button — it appears but provides no actionable copy mechanism.
2. Ctrl+Shift+C stops working while the overlay is shown — the terminal shortcut is intercepted.
3. Dismissing the overlay (Escape or clicking outside) deselects the text — so you can no longer copy after closing it.

The net result is that it is impossible to copy text from a Claude Code session.

Environment

• OS: Ubuntu Linux
• Terminal: GNOME Terminal (VTE 7600 / VTE 0.76.0)
• Connection: Local session
• TERM: xterm-256color
• COLORTERM: truecolor

Steps to reproduce

1. Run Claude Code locally in GNOME Terminal
2. Select any text in the chat with the mouse
3. A small blue overlay appears at the bottom of the UI
4. Press Ctrl+Shift+C → does not copy, shortcut is consumed
5. Press Escape or click outside → overlay disappears, text is deselected
6. No way to copy the selected text

Expected behavior

Either:

• The overlay should include a visible Copy button/action, OR
• Ctrl+Shift+C should still work and copy the selected text to clipboard, OR
• Dismissing the overlay should not deselect the text

Workaround

On X11: select text with mouse and middle-click to paste via PRIMARY buffer. This bypasses Claude Code entirely but is not always practical.