feat: Enhance animation and popover functionality across components

Commit notes

This commit introduces a comprehensive set of animation utilities and popover enhancements across various components, including AnimatedDropdown, FullscreenLoader, GainMeter, Header, KeyboardShortcuts, MorphDeleteButton, SampleEditDrawer, and SequencerTrack. Key updates include the integration of new animation keyframes and utilities for smoother transitions, as well as the adoption of a unified popover base style for consistent behavior. These changes significantly improve the user experience by providing more dynamic and visually appealing interactions throughout the application.