Function formatUpcomingTime

formatUpcomingTime(date: string | Date): string
Format an upcoming date as a friendly relative day + time, with calendar-day boundaries (NOT rolling 24-hour windows) in the user's local timezone.
Parameters
- date: string | Date
  Date to format (Date object or ISO date string)
Returns string
Formatted string, or empty string for invalid input
Example
```
// assume "now" is Mon 2:00 PM
  formatUpcomingTime(monAt11pm)   // "Today 11:00 PM"
  formatUpcomingTime(tueAt1am)    // "Tomorrow 1:00 AM"  — not "Today"
  formatUpcomingTime(wedAt4pm)    // "Wed 4:00 PM"
  formatUpcomingTime(in10Days)    // "Mar 12 10:00 AM"
```
- Defined in packages/utilities/src/formatters.ts:65