Resolves Issue #4871 (or enhances) **Additions** - **Customized Styling for Button Shortcuts:** Previously, button shortcuts/separator styling was standardized. We added customized styling for optional button shortcuts based on button accents and variants. - **Enhanced Storybook Catalogs:** We modified ShortcutCatalog in Button.stories.tsx to display button shortcuts across styles and various inputs.    --------- Co-authored-by: Félix Malfait <felix@twenty.com>