add missing files

frontend/src/lib/format.ts

@@ -0,0 +1,20 @@
+// Format a YYYY-MM-DD (or ISO) string as DDMMYY for user-facing dates.
+export function formatDDMMYY(dateStr: string | undefined): string {
+	if (!dateStr) return '';
+	const d = new Date(dateStr.slice(0, 10) + 'T00:00:00');
+	const day = String(d.getDate()).padStart(2, '0');
+	const mon = String(d.getMonth() + 1).padStart(2, '0');
+	const yr = String(d.getFullYear()).slice(2);
+	return `${day}${mon}${yr}`;
+}
+
+// Human-friendly date for due dates etc: "5 Aug" (adds year when not the
+// current one, e.g. "5 Aug 26"). Better than the compact DDMMYY code.
+export function formatShortDate(dateStr: string | undefined): string {
+	if (!dateStr) return '';
+	const d = new Date(dateStr.slice(0, 10) + 'T00:00:00');
+	if (Number.isNaN(d.getTime())) return '';
+	const mon = d.toLocaleDateString('en-GB', { month: 'short' });
+	const sameYear = d.getFullYear() === new Date().getFullYear();
+	return `${d.getDate()} ${mon}${sameYear ? '' : ' ' + String(d.getFullYear()).slice(2)}`;
+}