feat: v0.9.0 — single-screen 3-pane shell + left Assets pane (wallet/reputation/fleet/time controls) from a single /api/state poll; right pane placeholder

lib/format.test.ts

@@ -0,0 +1,29 @@
+import { describe, expect, it } from 'vitest';
+import { formatCash, formatFuel, formatSimClock } from './format';
+
+describe('formatCash', () => {
+  it('formats EUR with thousands separators and two decimals', () => {
+    expect(formatCash(20_000)).toBe('€20,000.00');
+    expect(formatCash(1_234_567.891)).toBe('€1,234,567.89');
+  });
+
+  it('handles zero and fractional values (refuel costs are fractional)', () => {
+    expect(formatCash(0)).toBe('€0.00');
+    expect(formatCash(30.4)).toBe('€30.40');
+  });
+});
+
+describe('formatFuel', () => {
+  it('shows current / max liters with the current value rounded', () => {
+    expect(formatFuel(6300, 6300)).toBe('6300 / 6300 L');
+    expect(formatFuel(1234.6, 6300)).toBe('1235 / 6300 L');
+    expect(formatFuel(0, 6300)).toBe('0 / 6300 L');
+  });
+});
+
+describe('formatSimClock', () => {
+  it('formats epoch ms as a UTC wall-clock string (deterministic across timezones)', () => {
+    expect(formatSimClock(Date.UTC(2026, 8, 17, 14, 5))).toBe('2026-09-17 14:05 UTC');
+    expect(formatSimClock(Date.UTC(2026, 0, 1, 0, 0))).toBe('2026-01-01 00:00 UTC');
+  });
+});