[FEATURE] Support Cmd+V image paste from clipboard

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When I copy an image in Finder (macOS, Terminal.app) and paste it with Cmd+V, only the filename is inserted as plain text and the image is never attached.

Drag-and-drop works correctly, and Ctrl+V also attaches the image, but supporting Cmd+V as well would make the experience more convenient in my view.

Proposed Solution

Pressing Cmd+V with an image in the clipboard should attach the image, just as Ctrl+V currently does.

Alternative Solutions

_No response_

Priority

Low - Nice to have

Feature Category

Interactive mode (TUI)

Use Case Example

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Additional Context

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