feat: use friendly event date labels

tests/event-date-format.test.ts

@@ -0,0 +1,32 @@
+import { describe, expect, test } from "bun:test";
+import { addDays } from "date-fns";
+import { formatEventRangeLabel, formatEventStartLabel } from "@/lib/event-date-format";
+
+describe("event-date-format", () => {
+	test("formats a timed start-only event with a friendly day label", () => {
+		const today = new Date();
+		today.setHours(10, 0, 0, 0);
+
+		expect(formatEventStartLabel(today.toISOString(), false)).toContain("Today · 10:00");
+	});
+
+	test("formats a same-day timed range without native locale helpers", () => {
+		const today = new Date();
+		today.setHours(10, 0, 0, 0);
+		const end = new Date(today);
+		end.setHours(11, 30, 0, 0);
+
+		expect(
+			formatEventRangeLabel({ start: today.toISOString(), end: end.toISOString(), allDay: false }),
+		).toContain("10:00–11:30");
+	});
+
+	test("formats all-day events with tomorrow labels when applicable", () => {
+		const tomorrow = addDays(new Date(), 1);
+		tomorrow.setHours(0, 0, 0, 0);
+
+		expect(
+			formatEventRangeLabel({ start: tomorrow.toISOString(), end: undefined, allDay: true }),
+		).toBe("Tomorrow");
+	});
+});