xfy d0492d02f0 Fix collapse drag not tracking finger — use dynamic dragRange based on actual height change
The fixed DRAG_RANGE_DP=200dp caused the collapse progress to advance faster
than the visual height change, making the calendar feel like it "outruns" the
finger. Now dragRangePx is computed as (weeks-1)×rowHeight, matching the
actual visual height delta during collapse so finger movement maps 1:1 to
visual change.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-15 16:29:24 +08:00
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