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-lock.json

@@ -8,6 +8,7 @@
       "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",