feat(ui,store): live today clock, rail as lane filter, b toggle, quick look on space

tests/due.test.ts

@@ -0,0 +1,37 @@
+import { describe, expect, it } from "vitest";
+import {
+  daysFromToday,
+  dueLabel,
+  dueTone,
+  nextFriday,
+  untilMidnight,
+} from "../src/lib/due";
+
+describe("due helpers read the day they are given", () => {
+  it("labels against the given today, not the wall clock", () => {
+    expect(dueLabel("2026-08-23", "2026-08-23")).toBe("today");
+    expect(dueLabel("2026-08-24", "2026-08-23")).toBe("tomorrow");
+    expect(dueLabel("2026-08-22", "2026-08-23")).toBe("yesterday");
+    expect(dueLabel("2026-08-23", "2026-08-30")).toBe("Aug 23");
+  });
+
+  it("tones against the given today", () => {
+    expect(dueTone("2026-08-22", "2026-08-23")).toBe("overdue");
+    expect(dueTone("2026-08-24", "2026-08-23")).toBe("soon");
+    expect(dueTone("2026-09-24", "2026-08-23")).toBe("normal");
+    expect(daysFromToday("2026-09-02", "2026-08-23")).toBe(10);
+  });
+
+  it("finds the friday after the given day, never the same one", () => {
+    expect(nextFriday("2026-08-23")).toBe("2026-08-28");
+    expect(nextFriday("2026-08-28")).toBe("2026-09-04");
+  });
+
+  it("arms the midnight timer for the coming midnight", () => {
+    const late = new Date(2026, 7, 23, 23, 59, 0);
+    expect(untilMidnight(late)).toBeGreaterThan(60_000);
+    expect(untilMidnight(late)).toBeLessThan(62_000);
+    const early = new Date(2026, 7, 23, 0, 0, 1);
+    expect(untilMidnight(early)).toBeGreaterThan(23 * 3_600_000);
+  });
+});