feature: Tag styling

### Describe the solution you'd like

I want tags to look like they do in obsidian: pill shapes. It should be possible with these semi-circle icons: ` `, and an option to add characters before and after tags.

<img width="569" height="99" alt="Image" src="https://github.com/user-attachments/assets/abd717a8-f69f-495b-bdde-31c53b3a76da" />