fix(settings): 修复窄窗口用量表格列重叠

apps/desktop/src/renderer/components/settings/usage/UsageBreakdownTables.tsx

@@ -40,8 +40,17 @@ const TD_CLASS =
  * `w-full + max-w-0` 让它先塌到 0 (打破"按最长内容取列宽"的默认行为) 再领走
  * 其余列分完后剩下的空间, 内层的 truncate 由此生效 (见 #3393 的同一段分析)。
  * pl-3 是列间距, 否则相邻两列的数字会贴到一起; 首列自身取 pl-0。
+ *
+ * `overflow-hidden` 是最后一道单元格边界: 模型行还有不可收缩的色块与 agent 标签,
+ * 即使浏览器在边界宽度下给首列算出异常小的宽度, 它们也不能穿透到数字列 (#3546)。
+ * 表本身另有明确的最小宽度, 空间不足时由外层 overflow-x-auto 横向滚动, 而不是
+ * 继续把首列压到不可读。
  */
-const FIRST_COL_CLASS = 'w-full max-w-0 pl-0';
+const FIRST_COL_CLASS = 'w-full max-w-0 overflow-hidden pl-0';
+
+/** 数字列保持完整可读所需的最小表宽; 低于该宽度时交给 Card 的横向滚动容器。 */
+const AGENT_TABLE_CLASS = 'w-full min-w-[520px] border-collapse';
+const MODEL_TABLE_CLASS = 'w-full min-w-[720px] border-collapse';
 
 function Swatch({ rank }: { rank: number }): React.JSX.Element {
   return (
@@ -92,7 +101,7 @@ export function UsageAgentTable({ rows }: { rows: AgentTokenRow[] }): React.JSX.
           />
         ))}
       </div>
-      <table className="w-full border-collapse">
+      <table className={AGENT_TABLE_CLASS}>
         <thead>
           <tr>
             <th className={cn(TH_CLASS, FIRST_COL_CLASS, 'text-left')}>
@@ -140,7 +149,7 @@ export function UsageModelTable({ rows }: { rows: ModelTokenRow[] }): React.JSX.
   const { t } = useTranslation();
 
   return (
-    <table className="w-full border-collapse">
+    <table className={MODEL_TABLE_CLASS}>
       <thead>
         <tr>
           <th className={cn(TH_CLASS, FIRST_COL_CLASS, 'text-left')}>

apps/desktop/src/renderer/components/settings/usage/__tests__/UsageBreakdownTables.test.tsx

@@ -0,0 +1,61 @@
+// @vitest-environment jsdom
+
+import React from 'react';
+import { render } from '@testing-library/react';
+import { describe, expect, it, vi } from 'vitest';
+
+import { UsageAgentTable, UsageModelTable } from '../UsageBreakdownTables';
+
+vi.mock('react-i18next', () => ({
+  useTranslation: () => ({
+    t: (key: string) => key,
+  }),
+}));
+
+describe('UsageBreakdownTables responsive layout', () => {
+  it('keeps the agent table wide enough for numeric columns to scroll instead of overlap', () => {
+    const { container } = render(
+      <UsageAgentTable
+        rows={[
+          {
+            agentKind: 'claude-code',
+            tokens: 1_000,
+            share: 1,
+            todayTokens: 100,
+            cacheHitRate: 0.5,
+            modelCount: 1,
+          },
+        ]}
+      />,
+    );
+
+    const table = container.querySelector('table');
+    expect(table?.className).toContain('min-w-[520px]');
+    expect(table?.querySelector('tbody td')?.className).toContain('overflow-hidden');
+  });
+
+  it('keeps the wider model table scrollable and clips first-column decorations at its boundary', () => {
+    const { container } = render(
+      <UsageModelTable
+        rows={[
+          {
+            key: 'codex:very-long-model-name',
+            agentKind: 'codex',
+            model: 'very-long-model-name-that-must-not-overlap-token-columns',
+            tokens: 1_000,
+            share: 1,
+            inputTokens: 400,
+            outputTokens: 300,
+            cacheReadTokens: 200,
+            cacheCreateTokens: 100,
+            cacheHitRate: 0.5,
+          },
+        ]}
+      />,
+    );
+
+    const table = container.querySelector('table');
+    expect(table?.className).toContain('min-w-[720px]');
+    expect(table?.querySelector('tbody td')?.className).toContain('overflow-hidden');
+  });
+});