Add opt-in date grouping for the All Notes list

src/lib/utils/time.ts

@@ -24,3 +24,20 @@ export function formatDate(dateStr: string): string {
 		minute: '2-digit'
 	});
 }
+
+// Relative-date bucket label for grouping the notes list:
+// Today / Yesterday / Previous 7 Days / Previous 30 Days / "June" (this year) / "June 2025".
+// Buckets are contiguous, so a list already sorted by date groups by consecutive label.
+export function dateBucketLabel(dateStr: string, now: Date = new Date()): string {
+	const d = new Date(dateStr);
+	const dayMs = 86400000;
+	const startOfDay = (x: Date) => new Date(x.getFullYear(), x.getMonth(), x.getDate()).getTime();
+	const today = startOfDay(now);
+	const day = startOfDay(d);
+	if (day >= today) return 'Today';
+	if (day >= today - dayMs) return 'Yesterday';
+	if (day >= today - 7 * dayMs) return 'Previous 7 Days';
+	if (day >= today - 30 * dayMs) return 'Previous 30 Days';
+	if (d.getFullYear() === now.getFullYear()) return d.toLocaleDateString(undefined, { month: 'long' });
+	return d.toLocaleDateString(undefined, { month: 'long', year: 'numeric' });
+}