Support file/image transfer by pasting files from the clipboard.

[gitstart]

fixes #568
fixes #210

PR Description

This PR add feature to send files that are copied to the clipboard

Demo video

https://www.loom.com/share/929b2113cc4a487e9b78781c0e30facd

---

This code was written and reviewed by GitStart Community. Growing great engineers, one PR at a time.

[Tienisto]

Thank you! I will test this out in a few days.

[Tienisto]

It works nice!

Do you know if this can be made more general? If I paste text, it does not work.

Thinking about this feature again, I think it would be simpler if a dialog is opened if the Flutter window gets refocused. Like "Do you want to use the clipboard contents? Cancel | Use Clipboard

This way, we don't need to add another button (that keeps the UI more clean).

Let me know if you can do that.

[gitstart]

Hi @Tienisto thanks for reviewing PR.

We can try to make pasting text work but do you think popup a dialog asking if user want to use clipboard content or not is a good user experience? If so then please let us know we will make changes accordingly.

[Tienisto]

You are right. I will just merge this until we have a better idea.