Accept image pastes from the clipboard for multi-modal LLMs to consume

### Description of the new feature

When using CLI based multi-modal LLMs for coding, it is common to paste a screenshot or image to the LLM for reference. In Windows I have to take a screenshot then drag and drop the file into the terminal chat which works, but is awkward and requires context switching.

### Proposed technical implementation details

I'm not sure how nix based shells handle this, but it is very cool and handy. You can see in the original Claude Code demo they paste the image directly into the shell.

Start with issue #19517 and trace the Windows Terminal paths for clipboard input and terminal chat handling. The issue names no files, tests, or entry points, so repository investigation is required; done means image pastes are accepted for the described multi-modal CLI workflow and the behavior is covered appropriately.

Written by the indexing model from the issue text.