fix: announcement

app.py

@@ -65,14 +65,16 @@ def fetch_announcement_from_sheet():
         df = pd.read_csv(url)
 
         if "Announcement" in df.columns:
-            content = str(df["announcement"].iloc[0]).strip()
+            content = str(df["Announcement"].iloc[0]).strip()
             if not content:
                 return "📢 尚無公告"
             return f"📢 {content}"
         else:
-            return "📢 無法讀取公告欄位"
+            print("Error: 無法讀取公告欄位")
+            return "📢 尚無公告"
     except Exception as e:
-        return f"📢 載入公告失敗：{str(e)}"
+        print(f"Error: 載入公告失敗：{str(e)}")
+        return "📢 尚無公告"
 
 def validate_openai_key(api_key):
     try: