SettingsDaemon: Add font change signal

settings-daemon/theme/com.cutefish.Theme.xml

@@ -73,5 +73,7 @@
     <signal name="cursorThemeChanged"></signal>
     <signal name="cursorSizeChanged"></signal>
     <signal name="iconThemeChanged"></signal>
+    <signal name="systemFontPointSizeChanged"></signal>
+
   </interface>
 </node>

settings-daemon/theme/thememanager.cpp

@@ -184,6 +184,7 @@ void ThemeManager::setSystemFontPointSize(qreal fontSize)
 {
     m_settings->setValue(s_systemPointFontSize, fontSize);
     updateGtkFont();
+    emit systemFontPointSizeChanged();
 }
 
 qreal ThemeManager::devicePixelRatio()

settings-daemon/theme/thememanager.h

@@ -30,7 +30,7 @@ class ThemeManager : public QObject
     Q_PROPERTY(bool darkModeDimsWallpaer READ darkModeDimsWallpaer WRITE setDarkModeDimsWallpaer NOTIFY darkModeDimsWallpaerChanged)
     Q_PROPERTY(QString systemFont READ systemFont WRITE setSystemFont)
     Q_PROPERTY(QString systemFixedFont READ systemFixedFont WRITE setSystemFixedFont)
-    Q_PROPERTY(qreal systemFontPointSize READ systemFontPointSize WRITE setSystemFontPointSize)
+    Q_PROPERTY(qreal systemFontPointSize READ systemFontPointSize WRITE setSystemFontPointSize NOTIFY systemFontPointSizeChanged)
     Q_PROPERTY(qreal devicePixelRatio READ devicePixelRatio WRITE setDevicePixelRatio)
     Q_PROPERTY(QString wallpaper READ wallpaper WRITE setWallpaper NOTIFY wallpaperChanged)
     Q_PROPERTY(int accentColor READ accentColor WRITE setAccentColor NOTIFY accentColorChanged)
@@ -96,6 +96,7 @@ signals:
     void cursorThemeChanged();
     void cursorSizeChanged();
     void iconThemeChanged();
+    void systemFontPointSizeChanged();
 
 private:
     void updateGtkFont();