feat: Add clipboard image paste support

[teeverc]

This pull request introduces a new feature to handle image pasting in the PureMultimodalInput component. The main changes include adding a paste event listener and handling the image upload process.

Key changes:

• components/multimodal-input.tsx:
  • Added handlePaste function to process pasted images, upload them, and update the attachments state.
  • Added a useEffect hook to attach and detach the paste event listener to the textarea element.

Supports:

• Ctrl+v
• Right click paste

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[haydenbleasel]

Nice addition @teeverc - thanks!