Merge branch 'fix/datepicker-tz-offset' into 'main'

fix(ui): DatePicker off-by-one в TZ != UTC

See merge request 2-6/2-6-4/terravault/ordinis!299

ordinis-admin-ui/src/ui/components/date-picker.tsx

@@ -1,6 +1,7 @@
 import * as React from 'react'
 import { Input } from './input'
 import { FieldLabel, FieldHint, FieldError } from './field'
+import { formatIsoDate, parseFormDate } from '@/lib/dates'
 import { cn } from '@/lib/utils'
 
 /**
@@ -32,10 +33,13 @@ export type DatePickerProps = {
   inputClassName?: string
 }
 
+// Local-TZ форматирование. toISOString().slice(0,10) на Date в TZ != UTC
+// даёт day-shift (например, 21.06 MSK → "2026-06-20"), что выглядит как
+// «picker показывает на день меньше».
 const toIso = (v: Date | string | null | undefined): string => {
   if (!v) return ''
   if (typeof v === 'string') return v.slice(0, 10)
-  if (v instanceof Date && !isNaN(v.getTime())) return v.toISOString().slice(0, 10)
+  if (v instanceof Date && !isNaN(v.getTime())) return formatIsoDate(v)
   return ''
 }
 
@@ -64,8 +68,7 @@ export function DatePicker({
       onChange?.(null)
       return
     }
-    const d = new Date(raw + 'T00:00:00')
+    onChange?.(parseFormDate(raw))
-    onChange?.(isNaN(d.getTime()) ? null : d)
   }
 
   return (