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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