Feat: add tabSize to tabs

## 📑 Description Added a tabSize feature to the tabs and refactored a bit, hope you don't mind. - Active/inactive class comes from the context now (removed from the tabItem) - Removed stores and introduce runes - Refactored context - Added tabSize to the example page and fixed the example ## ✅ Checks - [X] My pull request adheres to the code style of this project - [X] My code requires changes to the documentation - [X] I have updated the documentation as required - [ ] All the tests have passed ## ℹ Additional Information <!-- Any additional information like breaking changes, dependencies added, screenshots, comparisons between new and old behavior, etc. -->