fix: ISSUE #I6B4CS 重复安装应用的bug

应用安装过程中，重新进入应用详情页，仅通过 `dpkg-query -s $pkgName` 判断本地是否已安装，未判断当前安装任务执行状态

Log: 判断本地安装状态后，执行 isDownloading 函数判断安装任务状态，更新按钮显示状态；整理应用详情页代码

src/pages/appintopage.h

@@ -1,52 +1,55 @@
 #ifndef APPINTOPAGE_H
 #define APPINTOPAGE_H
 
-#include <QWidget>
-#include <QUrl>
-#include <QString>
-#include <QtConcurrent>
-#include <QClipboard>
-#include "backend/sparkapi.h"
-#include "backend/image_show.h"
-#include "widgets/downloadlistwidget.h"
 #include "utils/utils.h"
+
+#include <QWidget>
+#include <QJsonObject>
+#include <QUrl>
+
 namespace Ui {
 class AppIntoPage;
 }
 
+class SparkAPI;
+class DownloadListWidget;
 class AppIntoPage : public QWidget
 {
     Q_OBJECT
 
 public:
-    void clear();
-    void setDownloadWidget(DownloadListWidget *w);
-    void setTheme(bool dark);
-    void openUrl(QUrl url);
     explicit AppIntoPage(QWidget *parent = nullptr);
-    ~AppIntoPage();
+    ~AppIntoPage() override;
 
-private slots:
-    void on_downloadButton_clicked();
-
-    void on_pushButton_3_clicked();
-
-    void on_shareButton_clicked();
-
-    void on_updateButton_clicked();
+    void openUrl(const QUrl &url);
+    void clear();
+    void setTheme(bool dark);
+    void setDownloadWidget(DownloadListWidget *w);
 
 private:
-    SparkAPI *api1;
-    QJsonObject info;
-    QPixmap iconpixmap;
-    QUrl spk;
-    void isDownloading(QUrl url);
-    void sltAppinfoTags(QStringList *tagList);
-    DownloadListWidget *dw;
-    Ui::AppIntoPage *ui;
+    void initUI();
+    void initConnections();
+    void isDownloading(const QUrl &url);
+    void setAppinfoTags(const QStringList &tagList);
 
 signals:
     void clickedDownloadBtn();
+
+private slots:
+    void on_downloadButton_clicked();
+    void on_pushButton_3_clicked();
+    void on_shareButton_clicked();
+    void on_updateButton_clicked();
+
+private:
+    Ui::AppIntoPage *ui;
+
+    SparkAPI *api;
+    DownloadListWidget *dw = nullptr;
+
+    QJsonObject info;
+    QPixmap iconpixmap;
+    QUrl spk;
 };
 
 #endif // APPINTOPAGE_H