test: harden grok quota readiness

frontend/src/i18n/locales/en.ts

@@ -4159,6 +4159,9 @@ export default {
         grokResetUnsupported: 'Reset unsupported',
         grokResetUnsupportedTooltip: 'xAI does not expose reset credits for Grok OAuth accounts',
         grokNoHeaders: 'No quota headers observed',
+        grokLastStatus: 'Status {status}',
+        grokLastProbe: 'Probe {time}',
+        grokLastHeadersSeen: 'Headers {time}',
         passiveSampled: 'Passive',
         activeQuery: 'Query'
       },

frontend/src/i18n/locales/zh.ts

@@ -3417,6 +3417,9 @@ export default {
         grokResetUnsupported: '不支持重置',
         grokResetUnsupportedTooltip: 'xAI 未向 Grok OAuth 账号开放重置额度接口',
         grokNoHeaders: '未观察到配额响应头',
+        grokLastStatus: '状态 {status}',
+        grokLastProbe: '探测 {time}',
+        grokLastHeadersSeen: '响应头 {time}',
         passiveSampled: '被动采样',
         activeQuery: '查询'
       },