Fix fonts

Author: MusyaCliento

Launcher.props

@@ -10,7 +10,7 @@
         5. publish-release.yml GitHub Actions workflow
         -->
         <TargetFramework>net10.0</TargetFramework>
-        <Version>0.38.0.49</Version>
+        <Version>0.38.0.50</Version>
         <UseRidGraph>true</UseRidGraph>
 
         <!--

SS14.Launcher/Theme/AppThemeManager.cs

@@ -414,6 +414,17 @@ private static bool TryApplyFontCached(Application app, string descriptor, out E
     private static bool TryApplyFont(Application app, string descriptor, out Exception? error)
     {
         error = null;
+
+        if (Uri.TryCreate(descriptor, UriKind.Absolute, out var uri) && uri.IsFile)
+        {
+            var path = uri.LocalPath;
+            if (!string.IsNullOrWhiteSpace(path) && !File.Exists(path))
+            {
+                error = new FileNotFoundException("Font file not found.", path);
+                return false;
+            }
+        }
+
         try
         {
             var family = new FontFamily(descriptor);