Added paste image support on Tauri

[tobias-kuendig]

Description

This PR introduces support to paste images when Cinny is running in the context of Tauri (cinny-desktop).

The implementation calls a new Tauri command introduced in cinnyapp/cinny-desktop#167. If an image is found in the clipboard, it is attached to the message. If not, the same logic as before will be used to populate the field from the clipboard.

This PR depends on cinnyapp/cinny-desktop#167

Fixes cinnyapp/cinny-desktop#69

Tested on Ubuntu 22.04 LTS on Wayland.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[tobias-kuendig]

I have read the CLA Document and I hereby sign the CLA

[K4LCIFER]

What is the current status of this PR?

[PoneyClairDeLune]

Will this PR ever be merged?

[tobias-kuendig]

While it is a shame that the PR is still open, please refrain from adding empty comments.

The PR will get merged when the maintainers have time to review it.