Add shortcut for pasting image from clipboard

[jongalloway]

Add image paste hotkey as per github/copilot-cli#476 (comment)

Why:

Closes: #44578

What's being changed (if available, include any code snippets, screenshots, or gifs):

Adds image paste keyboard shortcut (Alt-V)

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds a new keyboard shortcut to the Copilot CLI command reference to document pasting images from the clipboard as attachments.

Changes:

• Documented a new shortcut (Alt+V) for pasting images from the clipboard as an attachment.

Show a summary per file

File	Description
content/copilot/reference/copilot-cli-reference/cli-command-reference.md	Updates the keyboard shortcut table to include image-paste behavior.

Copilot's findings

• Files reviewed: 1/1 changed files
• Comments generated: 1

[github-actions]

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Source	Review	Production	What Changed
copilot/reference/copilot-cli-reference/cli-command-reference.md	fpt ghec	fpt ghec

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