fix: 修复农历日期显示错误

- 修复 getFriendlyDateDescription 函数错误地将公历月/日当作农历参数传入的问题
- 正确使用 getLunarFromSolar 将公历日期转换为农历显示

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/utils/countdown.ts

@@ -1,4 +1,5 @@
 import { Lunar } from 'lunar-javascript';
+import { getLunarFromSolar } from './lunar';
 
 export interface CountdownResult {
   days: number;
@@ -267,12 +268,9 @@ export function getFriendlyDateDescription(
   const day = targetDate.getDate();
 
   if (isLunar) {
-    // 显示农历
-    const result = safeCreateLunarDate(targetDate.getFullYear(), month, day);
-    if (result) {
-      return `${result.lunar.getMonthInChinese()}月${result.lunar.getDayInChinese()}`;
-    }
-    return `${month}月${day}日`;
+    // 显示农历：使用 getLunarFromSolar 将公历日期正确转换为农历
+    const lunarInfo = getLunarFromSolar(targetDate);
+    return `${lunarInfo.monthInChinese}${lunarInfo.dayInChinese}`;
   }
 
   return `${month}月${day}日`;