Migrate to Pinia stores

[devmount]

Is your feature request related to a problem? Please describe. Currently, options are stored with vanilla local storage. Which is fine, but not very easy to maintain or extend.

Describe the solution you'd like Use Pinia store for

• [ ] add-on options
• [ ] filter values
• [ ] stats store

Describe alternatives you've considered There are a lot of store solutions. Pinia is easy to use.

Additional context https://pinia.vuejs.org/