feat(sharing): Add share button to library grid and redesign shares page as timeline

Commit notes

- Add SharePopover component with inline share link creation - Add share button column to LibrarySampleGrid for quick sample sharing - Redesign shares page from create-link form to activity timeline view - Add quick filter sidebar to filter activity by share link - Add getAllShareActivity API endpoint for unified activity feed - Support filtering activity by specific share link - Display share link status (active, expired) and resource names

Co-authored-by: armin.naimi <[email redacted]>