feat(AppearanceView): Added screen scale factor

Adds a new 100% screen scaling factor for mobile to provide a more natural and consistent visual baseline across devices.
Also updates the default UI configuration:

- Font size: set to S
- Padding: set to XXS

These defaults help achieve a cleaner, more compact layout while improving readability and overall UI density on mobile.

Author: noeliaSD

mobile/wrapperApp/sources/main.cpp

@@ -11,7 +11,7 @@ int main(int argc, char* argv[])
 {
     Q_INIT_RESOURCE(resources);
     qputenv("QT_FILE_SELECTORS", "noWebEngine");
-    qputenv("QT_SCALE_FACTOR", "0.8");
+    qputenv("QT_SCALE_FACTOR", "1.0");
 
 #if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
     qmlRegisterModule("Qt.labs.settings", 1, 1);

ui/app/mainui/AppMain.qml

@@ -869,10 +869,15 @@ Item {
         property var recentEmojis
         property string skinColor // NB: must be a string for the twemoji lib to work; we don't want the `#` in the name
         property int theme: Theme.Style.System
-        property int fontSize: Theme.FontSize.FontSizeM
+        property int fontSize: {
+            if (appMain.width < Theme.portraitBreakpoint.width) {
+                return Theme.FontSize.FontSizeS
+            }
+            return Theme.FontSize.FontSizeM
+        }
         property int paddingFactor: {
             if (appMain.width < Theme.portraitBreakpoint.width) {
-                return Theme.PaddingFactor.PaddingS
+                return Theme.PaddingFactor.PaddingXXS
             }
             return Theme.PaddingFactor.PaddingM
         }