A required `date: Date` prop bound to a defaultless `@config.date` arrives as
undefined at the dynamic render edge → `date.getDay()` threw, white-screening
ui-day-cell. Type `date?` and fall back to today via `safeDate`. Defense-in-depth
under the both-edge required-Date seeding (which the patterns object→date mistype
had silently disabled). See Almadar_LOLO_Type_System_Audit §3.8 (B5).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>