feat(Board): corner widget chrome, custom widget mods, layout-change reason, dragCancel default - #1350

Bugbot Analysis Progress (2m 31s elapsed)

✅ Gathered PR context (6s)
✅ Completed bug detection (2m 24s)
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Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_78ecc1a8-cf26-4407-8066-f5867ed0527c