feat: 添加 EmptyPlaceholder 组件并更新相关页面

- 新增 EmptyPlaceholder 组件，用于统一处理空状态提示，提升用户体验。
- 更新多个页面（JsonTools、Jwt、QrCode、Timestamp）以使用 EmptyPlaceholder 组件，简化空状态的实现。
- 更新 README.md，添加 EmptyPlaceholder 组件的说明。

src/pages/JsonTools/components/JsonConvertSection.tsx

@@ -1,6 +1,7 @@
 import React, { useEffect, useMemo, useState } from 'react';
 import { formatBytes } from '@/utils/format';
 import { CopyButton } from '@/components/CopyButton';
+import EmptyPlaceholder from '@/components/EmptyPlaceholder';
 import TextInputArea from '@/components/TextInputArea';
 import { validateJson } from '@/utils/jsonFormatter';
 import { cn } from '@/lib/utils';
@@ -132,11 +133,9 @@ export default function JsonConvertSection({
           </div>
         </div>
       ) : (
-        <div className="p-8 rounded-xl bg-muted/30 border border-dashed border-border/80 text-center flex flex-col items-center justify-center min-h-[120px] select-none">
-          <p className="text-xs font-semibold text-muted-foreground/80 tracking-wide max-w-[240px] leading-relaxed">
-            {error ? '请修正上方 JSON 的语法错误以开启实时流式格式化' : labels.emptyHint}
-          </p>
-        </div>
+        <EmptyPlaceholder>
+          {error ? '请修正上方 JSON 的语法错误以开启实时流式格式化' : labels.emptyHint}
+        </EmptyPlaceholder>
       )}
     </div>
   );

src/pages/JsonTools/components/JsonFormatSection.tsx

@@ -7,6 +7,7 @@ import {
 } from '@/utils/jsonFormatter';
 import { formatBytes } from '@/utils/format';
 import { CopyButton } from '@/components/CopyButton';
+import EmptyPlaceholder from '@/components/EmptyPlaceholder';
 import SwitchButtonGroup from '@/components/SwitchButtonGroup';
 import TextInputArea from '@/components/TextInputArea';
 import { Checkbox } from '@/components/ui/checkbox';
@@ -148,12 +149,9 @@ export default function JsonFormatSection() {
           </div>
         </div>
       ) : (
-        /* 空状态指示引导区 */
-        <div className="p-8 rounded-xl bg-muted/30 border border-dashed border-border/80 text-center flex flex-col items-center justify-center min-h-[120px] select-none">
-          <p className="text-xs font-semibold text-muted-foreground/80 tracking-wide max-w-[240px] leading-relaxed">
-            {error ? '请修正上方 JSON 的语法错误以开启实时流式格式化' : '输入 JSON 后点击格式化'}
-          </p>
-        </div>
+        <EmptyPlaceholder>
+          {error ? '请修正上方 JSON 的语法错误以开启实时流式格式化' : '输入 JSON 后点击格式化'}
+        </EmptyPlaceholder>
       )}
     </div>
   );

src/pages/JsonTools/index.tsx

@@ -4,6 +4,7 @@ import DiffNavigator from './components/DiffNavigator';
 import JsonFormatSection from './components/JsonFormatSection';
 import JsonConvertSection from './components/JsonConvertSection';
 import SwitchButtonGroup from '@/components/SwitchButtonGroup';
+import EmptyPlaceholder from '@/components/EmptyPlaceholder';
 import { useJsonTools } from './useJsonTools';
 import type { JsonToolsPageMode } from '@/types/storage';
 import type { ViewMode } from './types';
@@ -95,13 +96,11 @@ export default function Index() {
               <DiffResult result={diffResult} viewMode={viewMode} activePath={activePath} />
             </div>
           ) : (
-            <div className="p-8 rounded-xl bg-muted/30 border border-dashed border-border/80 text-center flex flex-col items-center justify-center min-h-[140px]">
-              <p className="text-xs font-semibold text-muted-foreground/80 tracking-wide max-w-[260px] leading-relaxed">
-                {leftError || rightError
-                  ? '请修正上方 JSON 的语法错误以开启实时流式比对'
-                  : '输入两侧 JSON 后点击比较'}
-              </p>
-            </div>
+            <EmptyPlaceholder className="min-h-[140px]" messageClassName="max-w-[260px]">
+              {leftError || rightError
+                ? '请修正上方 JSON 的语法错误以开启实时流式比对'
+                : '输入两侧 JSON 后点击比较'}
+            </EmptyPlaceholder>
           )}
         </div>
       ) : pageMode === 'format' ? (