fix: resolve WiX INSTALLDIR symbol reference error in Electron desktop app

Added proper INSTALLDIR directory definition to WiX template to fix
"Unresolved reference to symbol 'Directory:INSTALLDIR'" error during
Windows installer generation.

Changes:
- Added INSTALLDIR directory definition under ProgramFilesFolder
- Named installation directory "API Testing"
- Ensures INSTALLDIR symbol is available for component references

This resolves the Windows MSI build failure in the desktop packaging workflow.

Fixes: error LGHT0094 - Unresolved reference to symbol 'Directory:INSTALLDIR'

Author: KariHall619

console/atest-desktop/forge.config.js

@@ -71,6 +71,15 @@ module.exports = {
 
     </Product>`
           );
+
+          // Ensure INSTALLDIR is properly defined in the directory structure
+          msiCreator.wixTemplate = msiCreator.wixTemplate.replace(
+            '<Directory Id="TARGETDIR" Name="SourceDir">',
+            `<Directory Id="TARGETDIR" Name="SourceDir">
+      <Directory Id="ProgramFilesFolder">
+        <Directory Id="INSTALLDIR" Name="API Testing" />
+      </Directory>`
+          );
         }
       }
     }