refactor(Header, WorkspaceContextIndicator): update component styles for improved UI consistency

Commit notes

- Adjusted border radius from 'rounded-xl' to 'rounded-lg' in Header component for a more uniform appearance. - Updated button styles in WorkspaceContextIndicator to use 'rounded-md' instead of 'rounded-lg' for consistency across components. - Modified padding and size of avatar images for better alignment and visual balance. - Refined loading skeleton styles to enhance user experience during loading states.

These changes enhance the overall aesthetic and usability of the header and workspace context components.