refactor(Timestamp): 规范化页面组件目录结构

- 将子组件移至 components/ 子目录（LiveClock、ResultView）
- 创建 __tests__/ 目录结构
- 更新所有相关导入路径

Co-authored-by: Cursor <cursoragent@cursor.com>

src/pages/Timestamp/components/ResultView.tsx

@@ -0,0 +1,52 @@
+import React from 'react';
+import { CopyButton } from '@/components/CopyButton';
+import { useI18n } from '@/utils/chromeI18n';
+import { cn } from '@/lib/utils';
+
+interface ResultViewProps extends React.HTMLAttributes<HTMLDivElement> {
+  result: string;
+  showEmptyPlaceholder?: boolean;
+}
+
+export default function ResultView({
+  result,
+  showEmptyPlaceholder = false,
+  className,
+  ...props
+}: ResultViewProps) {
+  const { t } = useI18n('timestamp');
+
+  if (!result) {
+    if (!showEmptyPlaceholder) return null;
+    return (
+      <div
+        className={cn(
+          'flex-1 flex items-center justify-center text-sm font-medium border border-dashed border-border/60 rounded-xl py-12 px-4 text-center text-muted-foreground bg-muted/20 min-h-[320px]',
+          className,
+        )}
+        {...props}
+      >
+        {t('timestamp:resultEmpty')}
+      </div>
+    );
+  }
+
+  return (
+    <div className={cn('flex flex-col w-full', className)} {...props}>
+      <span className="block text-muted-foreground/90 mb-2.5 text-xs font-semibold tracking-wider uppercase">
+        {t('timestamp:resultLabel')}
+      </span>
+
+      <div className="bg-card text-card-foreground border border-border p-4 sm:p-5 rounded-xl relative shadow-sm flex justify-between items-center gap-4 focus-within:ring-1 focus-within:ring-ring">
+        <span className="font-mono font-extrabold text-foreground break-all text-xl sm:text-2xl tracking-tight leading-tight select-all tabular-nums">
+          {result}
+        </span>
+        <CopyButton
+          text={result}
+          tooltip={t('timestamp:copyResultTooltip')}
+          className="h-8 w-8 rounded-md shrink-0 border"
+        />
+      </div>
+    </div>
+  );
+}