Smoother Gantt navigation and predictable task scheduling

Improved

• When a dependency prevents a task move, a message now explains the adjustment and shows the resulting start date.

Bug Fixes

• Moving or creating a task no longer unexpectedly pulls the timeline back to today.
• Collapsing or expanding the task panel now keeps your current timeline position.
• Task edits no longer replay a horizontal scroll animation after the change is saved.
• Moving a task before its sprint’s dependency boundary now adjusts only that task and its actual dependents, leaving independent tasks in place.
• Repeated blocked moves no longer push other sprint tasks farther into the future. Changes to a predecessor sprint still move its dependent sprint together, preserving task durations and spacing.