fix(i18n): avoid duplicate Chinese FIRMS age suffix

src/i18n/firms-live-zh.test.mjs

@@ -0,0 +1,43 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { getLocale, setLocale } from './index.js';
+import { createModel } from '../layers/firms/model.js';
+import { createQueries } from '../layers/firms/queries.js';
+
+const cases = [
+  [0, '不到 1 分钟前', '<1m ago'],
+  [120000, '2 分钟前', '2m ago'],
+  [7200000, '2 小时前', '2h ago'],
+];
+
+for (const [age, zh, en] of cases) {
+  test(`FIRMS live age ${age} ms has one relative-time suffix`, (context) => {
+    const now = 1800000000000;
+    context.mock.method(Date, 'now', () => now);
+    const previousLocale = getLocale();
+    const layerState = {
+      _loading: false,
+      _stale: false,
+      _keyRequired: false,
+      _error: null,
+      _lastUpdate: now - age,
+      _count: 1,
+      _cellCount: 0,
+      _fires: [],
+    };
+    const model = createModel({ services: { anchors: {} } });
+    const { methods } = createQueries({
+      layerState,
+      components: { model },
+      config: {},
+    });
+    try {
+      setLocale('en');
+      assert.equal(methods.getStats().loadingLabel, `LIVE · updated ${en}`);
+      setLocale('zh-CN');
+      assert.equal(methods.getStats().loadingLabel, `实时 · 更新于 ${zh}`);
+    } finally {
+      setLocale(previousLocale);
+    }
+  });
+}

src/i18n/locales/zh-CN.json

@@ -714,7 +714,7 @@
   "refreshing...": "刷新中…",
   "loading...": "加载中…",
   "KEY REQUIRED": "需要密钥",
-  "LIVE · updated {age}": "实时 · 更新于 {age}前",
+  "LIVE · updated {age}": "实时 · 更新于 {age}",
   "Source snapshot time unavailable": "来源快照时间不可用",
   "Live data unavailable": "实时数据不可用",
   "Low-accuracy score < 2%": "低精度评分 < 2%",