Multiline Paste Warning should be Editable

# Description of the new feature/enhancement

Teams and other programs often add Headers or additional text to the Copy/Paste. I propose we make the MultiLine Warning dialog editable so we can modify the contents prior to confirming the paste.

# Proposed technical implementation details (optional)

I propose one of two solutions.
1. Add an Edit button to allow us to edit the contents of the paste.
2. Convert the text to a Textbox so we can Edit prior to confirming.

I am thinking a button can go right here.

No source files, tests, or entry points are named. Start by locating the multiline paste warning dialog shown in the issue, then trace how pasted text reaches its confirmation action. Done means the warning content can be edited before the paste is confirmed, with the existing confirmation behavior preserved.

Written by the indexing model from the issue text.