feat: Update Visit model to use DateTimeField for start and end dates, and enhance AdventureModal with datetime-local inputs

frontend/src/lib/index.ts

@@ -338,6 +338,12 @@ export let LODGING_TYPES_ICONS = {
 	other: '❓'
 };
 
+// Helper to check if a given date string represents midnight (all-day)
+export function isAllDay(dateStr: string | string[]) {
+	// Checks for the pattern "T00:00:00.000Z"
+	return dateStr.includes('T00:00:00Z') || dateStr.includes('T00:00:00.000Z');
+}
+
 export function getAdventureTypeLabel(type: string) {
 	// return the emoji ADVENTURE_TYPE_ICONS label for the given type if not found return ? emoji
 	if (type in ADVENTURE_TYPE_ICONS) {