Components: Date and time #11

REQUIREMENTS §22 (Date and time), §25.1–§25.4. Base: shadcn calendar, popover. Libraries: react-day-picker, date-fns, @internationalized/date, FullCalendar v6 (standard plugins only).

• Date picker (§25.1, test per bullet)
• Date-time picker (§25.3)
• Time picker (§25.2)
• Date-time range (§25.4)
• Month / year picker
• Hijri date (display, picker, calendar)
• Full calendar (@javaabu/onu/calendar)
• Multiple-date picker
• Week picker
• Reporting-period picker

Merged into claude/amazing-cerf-htnpm8. 153 tests; coverage 98.6% lines / 94.2% branches.

Follow-ups:

• Figma components + Code Connect (Figma kit & token sync #29)
• FullCalendar date click / drag are pointer-only (documented keyboard alternatives)