greeter: fix custom themes and font family

fixes #776

quickshell/Modules/Greetd/GreetdSettings.qml

@@ -81,6 +81,9 @@ Singleton {
                 settingsLoaded = true
 
                 if (typeof Theme !== "undefined") {
+                    if (currentThemeName === "custom" && customThemeFile) {
+                        Theme.loadCustomThemeFromFile(customThemeFile)
+                    }
                     Theme.applyGreeterTheme(currentThemeName)
                 }
             }

quickshell/Widgets/StyledText.qml

@@ -16,8 +16,8 @@ Text {
     }
 
     readonly property string resolvedFontFamily: {
-        const requestedFont = isMonospace ? SettingsData.monoFontFamily : SettingsData.fontFamily
-        const defaultFont = isMonospace ? SettingsData.defaultMonoFontFamily : SettingsData.defaultFontFamily
+        const requestedFont = isMonospace ? Theme.monoFontFamily : Theme.fontFamily
+        const defaultFont = isMonospace ? "Fira Code" : "Inter Variable"
 
         if (requestedFont === defaultFont) {
             return isMonospace ? firaCodeFont.name : interFont.name
@@ -34,7 +34,7 @@ Text {
     color: Theme.surfaceText
     font.pixelSize: Appearance.fontSize.normal
     font.family: resolvedFontFamily
-    font.weight: SettingsData.fontWeight
+    font.weight: Theme.fontWeight
     wrapMode: Text.WordWrap
     elide: Text.ElideRight
     verticalAlignment: Text.AlignVCenter