fix(O3-5328): set default date range to today in orders app

[BlessedAmrita]

Requirements

• This PR has a title that briefly describes the work done including the ticket number. If there is a ticket, make sure your PR title includes a conventional commit label. See existing PR titles for inspiration.
• My work is based on designs, which are linked or shown either in the Jira ticket or the description below. (See also: Styleguide)
• My work includes tests or is validated by existing tests.

Summary

This PR addresses an issue where the Orders app date picker was empty by default, requiring users to manually select a range to view orders. Additionally, the start date logic was updated to use a simple date string (YYYY-MM-DD) to prevent timezone offsets from incorrectly fetching orders from the previous day.

Screenshots

Before:


After:
(Default Page)

(Any other date)

Related Issue

https://issues.openmrs.org/browse/O3-5328

Other

[denniskigen]

Suggested change

	// Derived API filter dates (ISO strings)
	// Derived API filter dates with explicit time boundaries for accurate date range filtering

[denniskigen]

Suggested change

	const selectedToDate = useMemo(() => (endDate ? dayjs(endDate).endOf('day').toISOString() : null), [endDate]);
	const selectedFromDate = useMemo(() => {
	if (!startDate) {
	return null;
	}
	return dayjs(startDate).startOf('day').toISOString();
	}, [startDate]);
	const selectedToDate = useMemo(() => {
	if (!endDate) {
	return null;
	}
	return dayjs(endDate).endOf('day').millisecond(0).toISOString();
	}, [endDate]);

Would something like this work better here, @ibacher? Especially w.r.t to same day filtering and timezone ambiguity.