Enhance StepSequencer and CreatorAnalytics components for improved user experience

Commit notes

- Updated StepSequencer to handle empty sample packs gracefully with a placeholder and disabled state. - Refactored CreatorAnalytics to improve code readability and maintainability by organizing imports and adjusting component structure. - Enhanced MarketPage to include a new button for trying packs in the sequencer, improving navigation and user interaction. - Updated Sequencer to load specific packs based on query parameters, ensuring a seamless user experience when accessing sample packs.