feat: enhance notification icon handling

Updated the image processing for notification icons to avoid temporary file usage by converting images to data URL format. Added scaling for icons larger than 16x16 pixels and implemented JPEG compression to reduce memory usage. This change improves performance and reliability in displaying notification icons.

Log: as title

Author: yixinshark

panels/notification/bubble/bubbleitem.cpp

@@ -10,6 +10,7 @@
 #include <QDBusArgument>
 #include <QTemporaryFile>
 #include <QLoggingCategory>
+#include <QBuffer>
 
 #include <DIconTheme>
 
@@ -141,14 +142,23 @@ static QString imagePathOfNotification(const QVariantMap &hints, const QString &
         img = decodeImageFromBase64(imageData);
     }
     if (!img.isNull()) {
-        QTemporaryFile file("notification_icon");
-        img.save(file.fileName());
-        return file.fileName();
+        // 通知图标通常16x16
+        const int size = 16;
+        if (img.width() > size || img.height() > size) {
+            img = img.scaled(size, size, Qt::KeepAspectRatio, Qt::SmoothTransformation);
+        }
+
+        // 将图片转换为data URL格式，避免临时文件问题
+        QByteArray ba;
+        QBuffer buffer(&ba);
+        buffer.open(QIODevice::WriteOnly);
+        // 使用JPEG格式和适当压缩率减少内存占用
+        img.save(&buffer, "JPEG", 85);
+        QString dataUrl = QString("data:image/jpeg;base64,%1").arg(QString::fromLatin1(ba.toBase64()));
+        return dataUrl;
     }
 
-    DGUI_USE_NAMESPACE;
-    auto icon = DIconTheme::findQIcon(appName, DIconTheme::findQIcon("application-x-desktop"));
-    return icon.name();
+    return {};
 }