Fix Selector Header to match sort header size

[mattcarter11]

• Refactor it to centralize the layout in one Composable
• Fix the size not matching with the Sort Header

Before

https://github.com/user-attachments/assets/50431077-e08d-44f0-9564-d5d09ce72be9

After

https://github.com/user-attachments/assets/4525bec2-3211-4afa-bf0f-92730b4cb3bb

[mikooomich]

Thanks! Could you please rebase off of dev? Multi select was largely refactored, and there will likely require some header adaptations.

[mattcarter11]

@mikooomich since the change is so simple, i've done it in a new branch and PR. I close this one.

https://github.com/DD3Boh/OuterTune/pull/67