feat(12.2-04): add the datepicker field and stored date and time list cells

- pin @internationalized/date 3.12.4 as a direct admin dependency (approved)
- dateFormat.ts parses and emits date, datetime (local display, UTC emit,
  ignoreTimezone wall clock) and time values without the global Date
- DatepickerField on Reka DatePicker and TimeField with locale segments,
  calendar popover, clear button, min/max and yearRange bounds
- list cells of type date and time render the stored string
- datepicker lang keys in en and pl; rebuilt boardwalk dist

admin/package.json

@@ -15,6 +15,7 @@
   "dependencies": {
     "@fontsource/dm-mono": "5.3.0",
     "@fontsource/dm-sans": "5.3.0",
+    "@internationalized/date": "3.12.4",
     "@lucide/vue": "1.17.0",
     "openapi-fetch": "0.17.0",
     "reka-ui": "2.9.10",