Add subscription info refresh endpoint and UI stats

test/web/client-controls.test.js

@@ -6,6 +6,8 @@ import {
   formatConnectionDuration,
   localProxyUrls,
   subscriptionDomain,
+  subscriptionDaysLeft,
+  subscriptionUsage,
 } from '../../src/web/utils/clientControls.js';
 
 test('connection button chooses the only valid client action', () => {
@@ -44,3 +46,21 @@ test('local proxy defaults to the macOS client port', () => {
     http: 'http://127.0.0.1:8082',
   });
 });
+
+test('subscription usage combines traffic and caps progress', () => {
+  assert.deepEqual(subscriptionUsage({ upload: 30, download: 80, total: 100, expire: 2 }), {
+    upload: 30,
+    download: 80,
+    total: 100,
+    used: 110,
+    percent: 100,
+    expiresAt: new Date(2000),
+  });
+});
+
+test('subscription expiry uses Russian day forms', () => {
+  const now = Date.parse('2026-07-11T00:00:00Z');
+  assert.equal(subscriptionDaysLeft(new Date('2026-07-12T00:00:00Z'), now), 'остался 1 день');
+  assert.equal(subscriptionDaysLeft(new Date('2026-07-13T00:00:00Z'), now), 'осталось 2 дня');
+  assert.equal(subscriptionDaysLeft(new Date('2026-07-16T00:00:00Z'), now), 'осталось 5 дней');
+});