Time-of-day buckets used by ActivitySessionFilter.timeOfDay. Each bucket is evaluated in the business's local timezone:

• morning — 05:00 through 11:59 local
• afternoon — 12:00 through 16:59 local
• evening — 17:00 through 23:59 local

Sessions starting between 00:00 and 04:59 local are deliberately excluded — businesses overwhelmingly don't schedule there, and the bucket carve-out keeps each option intuitive.