Paste drops $' sequence from clipboard content

Bug description

When pasting text that contains the character sequence $' (dollar sign followed by single quote), that sequence is silently dropped from the pasted content.

Reproduction

1. Copy the following SQL DDL to clipboard (e.g. from a text editor or terminal):

routing_number ~ '^\d{9}$') UNIQUE

1. Paste it into Claude Code's input

1. The pasted text becomes:

routing_number ~ '^\d{9}) UNIQUE

The $' before the closing paren is stripped.

Expected behavior

The full text including $' should be preserved on paste.

Notes

• This affects any content containing $' — regex patterns in SQL CHECK constraints are a common case
• $' is a special variable in some shell contexts (ANSI-C quoting in bash), which may be related to the stripping

Environment

• macOS (Darwin 24.6.0)
• Claude Code CLI