• Rename handleScrollCompensation to scrollCompensation
• Rename scrollTop prop to onScrollToTop to match event handler pattern
• Add onScrollCompensation alias for consistency with other event handlers
• Convert asset-date-group-actions.svelte to date-group-actions-lib.svelte.ts class
• Remove complex prop binding between asset-grid-without-scrubber and asset-date-group
• Use class instance in asset-date-group with direct method access
• Move all timeline rendering and scrolling logic to new component
• Keep scrubber logic and interaction handlers in original asset-grid
• Use composition pattern with header snippet for scrubber integration
• Simplify asset-grid to ~450 lines by extracting ~390 lines of core logic
