add button to add a sticker you see in a message to your own user sticker pack

[dozro]

Description

add button to add a sticker you see in a message to your own user sticker pack

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

[dozro]

I overlooked a small thingy (it sets the mime type as body lol). therefore PR ➭ draft

[dozro]

Should be ready for review now

fixed the spelling mistake from the screenshot in the description