fix: support pasting images from clipboard in chat (#209)

[kaixinbaba]

Summary

Fixes #209 — Copy and Pasting Images from Clipboard Does Not Work

Problem

When a user copies an image (e.g. a screenshot via Cmd+Shift+4 or Ctrl+PrtSc) and presses Ctrl+V / Cmd+V in the chat textarea, nothing happened. The chat input had no onPaste handler to intercept clipboard image data.

Solution

Added a handlePaste callback to lib/chat/components/chat-input.jsx that:

1. Checks e.clipboardData.items for any items with an image/* MIME type
2. If image items are found, calls e.preventDefault() to suppress default browser paste behavior
3. Converts each image item to a File object via item.getAsFile()
4. Passes the files to the existing handleFiles helper — the same path used by the file picker and drag-and-drop — so images appear in the attachment preview strip before sending

No new dependencies. The fix is minimal and consistent with the existing file attachment flow.

Testing

• Take a screenshot / copy any image to clipboard
• Open the chat input and press Cmd+V / Ctrl+V
• Image should appear in the attachment preview strip, ready to send

[kaixinbaba]

paste image screen record

paste_test.mp4