fix(settings): align settings pages with KDE HIG

src/translate/apikeystore.h

@@ -15,6 +15,7 @@ class ApiKeyStore : public QObject
 
     Q_PROPERTY(bool hasKey READ hasKey NOTIFY hasKeyChanged)
     Q_PROPERTY(QString error READ error NOTIFY errorChanged)
+    Q_PROPERTY(bool busy READ busy NOTIFY busyChanged)
 
 public:
     struct ReadResult {
@@ -26,9 +27,12 @@ public:
 
     bool hasKey() const;
     QString error() const;
+    bool busy() const;
 
     // Stores \a key, or removes the stored key when it is empty.
     Q_INVOKABLE void setKey(const QString &key);
+    // Repeats the failed read, write, or removal without asking for the key again.
+    Q_INVOKABLE void retry();
 
     // An empty key without error means none is stored.
     static QCoro::Task<ReadResult> readKey();
@@ -36,13 +40,18 @@ public:
 Q_SIGNALS:
     void hasKeyChanged();
     void errorChanged();
+    void busyChanged();
 
 private:
     QCoro::Task<> refresh();
     QCoro::Task<> store(QString key);
     void setHasKey(bool hasKey);
     void setError(const QString &error);
+    void setBusy(bool busy);
 
     bool m_hasKey = false;
     QString m_error;
+    bool m_busy = false;
+    bool m_retryStore = false;
+    QString m_pendingKey;
 };