feat: 数据格式改为按钮组选择

- 移除 Select 下拉框
- 改为 JSON/CSV 按钮组
- 选中状态与生成数量按钮样式统一

feat: 优化空值率设置

- 增加 75% 预设选项
- 设置 100% 时自动设为必填
- 限制输入范围 0-100

fix: 空值率预设改为纯数字显示

- 5%/20%/50%/75% 统一样式

fix: 移除空值率低/中/高 i18n 翻译键

fix: 精简生成数量预设选项

- 移除 10、500
- 保留 50、100、1000、5000、10000

src/pages/TestDataGenerator/components/FieldEditor.tsx

@@ -38,7 +38,14 @@ export default function FieldEditor({ field, onChange }: FieldEditorProps) {
   };
 
   const handleNullRateChange = (nullRate: number) => {
-    onChange({ ...field, nullRate });
+    // 限制范围 0-100
+    const clampedRate = Math.max(0, Math.min(100, nullRate));
+    // 设置为 100% 时自动设为必填
+    if (clampedRate === 100) {
+      onChange({ ...field, nullRate: clampedRate, required: true });
+    } else {
+      onChange({ ...field, nullRate: clampedRate });
+    }
   };
 
   const handleUniqueChange = (unique: boolean) => {
@@ -63,9 +70,10 @@ export default function FieldEditor({ field, onChange }: FieldEditorProps) {
   };
 
   const nullRatePresets = [
-    { label: t('testDataGenerator_nullRateLow'), value: 5 },
-    { label: t('testDataGenerator_nullRateMedium'), value: 20 },
-    { label: t('testDataGenerator_nullRateHigh'), value: 50 },
+    { label: '5%', value: 5 },
+    { label: '20%', value: 20 },
+    { label: '50%', value: 50 },
+    { label: '75%', value: 75 },
   ];
 
   return (
@@ -129,7 +137,12 @@ export default function FieldEditor({ field, onChange }: FieldEditorProps) {
             <Input
               type="number"
               value={field.nullRate}
-              onChange={(e) => handleNullRateChange(Number(e.target.value))}
+              onChange={(e) => {
+                const value = Number(e.target.value);
+                if (value >= 0 && value <= 100) {
+                  handleNullRateChange(value);
+                }
+              }}
               min={0}
               max={100}
               step={5}

src/pages/TestDataGenerator/components/GenerateOptions.tsx

@@ -5,13 +5,6 @@
 
 import { useI18n } from '@/utils/chromeI18n';
 import { Input } from '@/components/ui/input';
-import {
-  Select,
-  SelectContent,
-  SelectItem,
-  SelectTrigger,
-  SelectValue,
-} from '@/components/ui/select';
 
 interface GenerateOptionsProps {
   count: number;
@@ -22,7 +15,12 @@ interface GenerateOptionsProps {
   onDefaultNullRateChange: (rate: number) => void;
 }
 
-const COUNT_PRESETS = [10, 50, 100, 500, 1000, 5000, 10000];
+const COUNT_PRESETS = [50, 100, 1000, 5000, 10000];
+
+const FORMAT_OPTIONS = [
+  { value: 'json' as const, label: 'JSON' },
+  { value: 'csv' as const, label: 'CSV' },
+];
 
 export default function GenerateOptions({
   count,
@@ -76,15 +74,21 @@ export default function GenerateOptions({
         <label className="text-sm font-medium text-foreground">
           {t('testDataGenerator_format')}
         </label>
-        <Select value={format} onValueChange={(v) => onFormatChange(v as 'json' | 'csv')}>
-          <SelectTrigger className="h-9">
-            <SelectValue />
-          </SelectTrigger>
-          <SelectContent>
-            <SelectItem value="json">JSON</SelectItem>
-            <SelectItem value="csv">CSV</SelectItem>
-          </SelectContent>
-        </Select>
+        <div className="flex gap-2">
+          {FORMAT_OPTIONS.map((option) => (
+            <button
+              key={option.value}
+              onClick={() => onFormatChange(option.value)}
+              className={`flex-1 px-3 py-1.5 text-xs font-medium rounded-md transition-colors ${
+                format === option.value
+                  ? 'bg-primary text-primary-foreground'
+                  : 'bg-muted text-muted-foreground hover:bg-muted/80'
+              }`}
+            >
+              {option.label}
+            </button>
+          ))}
+        </div>
       </div>
 
       {/* 默认空值率 */}