Browser Extensions: Gemini canvas output is not imported.

[abn]

Describe the bug
When using the Firefox extension (also similar for Chrome), to import a conversation from Gemini, canvas outputs are ignored. This is especially important for deep research tasks performed by Gemini.

To Reproduce
Steps to reproduce the behavior:

1. Do a deep research in Gemini. Wait for research to complete providing a canvas document.
2. Launch browser extension to import conversations.
3. Import all messages
4. Check imported messages.

Expected behavior
Import must also import the canvas content. Would be amazing if this goes into the library and is considered during distill.