feat: add timezone conversion utilities for date filters

- Introduce functions to convert dates to UTC timestamps for start and end of day in specified timezones.
- Update datepicker component to utilize new timezone utilities for accurate date filtering.

Author: yahyafakhroji

packages/datum-ui/src/components/data-table/features/filter/components/datepicker.tsx

@@ -3,11 +3,11 @@ import type { DateRangePreset } from '../../../..'
 import { cn } from '@repo/shadcn/lib/utils'
 import { useCallback, useMemo } from 'react'
 import { CalendarDatePicker, Label } from '../../../..'
-import { toUTCTimestampEndOfDay, toUTCTimestampStartOfDay } from '../../../../../utils/timezone'
 import {
   useDateFilter,
   useDateRangeFilter,
 } from '../../../hooks/useFilterQueryState'
+import { toUTCTimestampEndOfDay, toUTCTimestampStartOfDay } from '../timezone'
 
 export interface DatePickerFilterProps {
   filterKey: string

packages/datum-ui/src/utils/timezone.ts …s/data-table/features/filter/timezone.tspackages/datum-ui/src/utils/timezone.ts renamed to packages/datum-ui/src/components/data-table/features/filter/timezone.ts packages/datum-ui/src/utils/timezone.ts renamed to packages/datum-ui/src/components/data-table/features/filter/timezone.ts

@@ -1,2 +1 @@
-export { toUTCTimestampEndOfDay, toUTCTimestampStartOfDay } from './timezone'
 export { cn } from '@repo/shadcn/lib/utils'