Add token usage tracking and UI refinements

web/static/i18n/en-US.json

@@ -127,6 +127,9 @@
     "vulnTotal": "Total vulnerabilities",
     "toolCalls": "Tool invocations",
     "successRate": "Tool success rate",
+    "tokenUsage": "Token usage",
+    "tokenUsageSub": "Last 7 days {{calls}} calls · Today {{today}}",
+    "noTokenUsageYet": "No usage yet",
     "clickToViewTasks": "Click to view tasks",
     "clickToViewChat": "Click to view conversations",
     "clickToViewVuln": "Click to view vulnerabilities",
@@ -633,6 +636,8 @@
     "turnDurationMinutes": "{{minutes}} min {{seconds}} sec",
     "turnDurationHours": "{{hours}} hr {{minutes}} min",
     "turnProcessAria": "{{state}}; expand or collapse execution details",
+    "turnTokenUsageLabel": "{{tokens}} tokens",
+    "turnTokenUsageTitle": "Token usage: {{total}} (input {{prompt}}, output {{completion}}, cached {{cached}}, reasoning {{reasoning}}, {{calls}} calls)",
     "turnNumber": "Turn {{number}}",
     "turnPending": "Processing…",
     "expandDetailLazyHint": "Expand details (loads iteration details on click)",

web/static/i18n/zh-CN.json

@@ -127,6 +127,9 @@
     "vulnTotal": "漏洞总数",
     "toolCalls": "工具调用次数",
     "successRate": "工具执行成功率",
+    "tokenUsage": "Token 用量",
+    "tokenUsageSub": "近 7 天 {{calls}} 次调用 · 今日 {{today}}",
+    "noTokenUsageYet": "暂无用量",
     "clickToViewTasks": "点击查看任务管理",
     "clickToViewChat": "点击查看对话",
     "clickToViewVuln": "点击查看漏洞管理",
@@ -621,6 +624,8 @@
     "turnDurationMinutes": "{{minutes}} 分钟 {{seconds}} 秒",
     "turnDurationHours": "{{hours}} 小时 {{minutes}} 分钟",
     "turnProcessAria": "{{state}}，展开或收起执行过程",
+    "turnTokenUsageLabel": "{{tokens}} tokens",
+    "turnTokenUsageTitle": "Token 用量：{{total}}（输入 {{prompt}}，输出 {{completion}}，缓存 {{cached}}，推理 {{reasoning}}，调用 {{calls}} 次）",
     "turnNumber": "第 {{number}} 轮",
     "turnPending": "正在处理…",
     "expandDetailLazyHint": "展开详情（点击后加载迭代详情）",