Allow image-only prompts in Codex VS Code Extension (no text message required)

What feature would you like to see?

Right now, when using the Codex VS Code Extension, image upload works — but it always requires an accompanying text message.
If you paste or drag an image into the chat, the extension blocks submission unless there’s at least one text character in the message box.

However, many visual-first workflows (e.g. screenshot debugging, UI/UX design feedback, OCR or code-in-image analysis) rely entirely on the image as the prompt.
For these use cases, the text message is redundant.

I’d like to request support for image-only prompts in the VS Code Extension — meaning users can send an image by itself without needing to type a message.

Example interaction:

🖼️ User pastes or drags an image → presses Enter → extension sends the image as the complete prompt

Additional information

• This mirrors how ChatGPT web and other OpenAI interfaces handle image-only queries.
• It improves speed for screenshot-based debugging and design analysis.