Image block editable bug

[hncheung9]

Describe the bug
BlockNoteView is configured as editable={false}. The image block with no embedded link, which is presented as an Add Image button, is still accessible and allowing user to input a link.

To Reproduce

1. Add a image block when BlockNoteView is editable={true}
2. Set editable={false}
3. Refresh and click on image block, which is in Add Image button state.
4. Able to embed link, which is not an allowed and expected behavior.

Misc

• Node version: v20.12.2
• BlockNote version: 0.12.4
• Package manager: pnpm
• Browser: chrome 123.0.6312.107