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Previously viewStart defaulted to today-30 and the scroll container had no left-edge expansion logic, so users hit a hard wall when scrolling left. This change: - Sets viewStart default to today so the viewport opens with today at the left edge (URL ?startDate= override still respected). - Adds left-edge auto-expansion in handleContainerScroll: when the user scrolls within 40 cells of the left boundary, 120 days are prepended and a useLayoutEffect applies the matching scrollLeft compensation in the same paint frame to prevent a visual jump. - Floors backward navigation at 5 years (minDate) to prevent unbounded viewDays growth. - Updates handleNavigateToday to match: resets to today rather than today-30. Both resource view and project view use the same TimelineContext / TimelineView, so both are fixed by this change. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>