Improves scroll indicator positioning when scrubbing through timelines with limited scrollable content (e.g., small albums). When a timeline's scrollable height is less than 50% of the viewport height, the scroll position is now properly distributed across the entire scrubber height, making the indicator more responsive and accurate.
Changes:
- Add `limitedScroll` state to detect scroll-constrained timelines (threshold: 50%)
- Introduce `ViewportTopMonth` type to handle lead-in/lead-out sections
- Calculate `totalViewerHeight` including top/bottom sections for accurate positioning
- Refactor scrubber to treat lead-in and lead-out as distinct scroll segments
- Update scroll position calculations to use relative percentages on constrained timelines
refactor(web): extract asset viewer logic from Timeline into TimelineAssetViewer component
- Extracted asset viewer navigation and action handling logic from Timeline.svelte into a dedicated TimelineAssetViewer component
- Reduces Timeline.svelte complexity by ~150 lines and improves separation of concerns
- No functional changes - purely a refactoring to improve code organization
## Changes
- Created new TimelineAssetViewer.svelte component containing all asset viewer-related logic
- Moved handlePrevious, handleNext, handleRandom, handleClose, handlePreAction, and handleAction methods
- Timeline.svelte now only passes required props to the new component
- Maintained all existing functionality including navigation, asset actions, and stack management
refactor(web): extract timeline keyboard actions into separate component
Extracts keyboard shortcuts and related functionality from Timeline component into a dedicated TimelineKeyboardActions component for better separation of concerns and maintainability.
