Standardizes JSON output: depth, UTF-8, key order

- Sorts top-level config keys before serialization for deterministic files and cleaner diffs.
- Increases JSON depth to 10 to retain nested settings.
- Writes JSON as UTF-8 via Set-Content for consistent encoding.
- Applies across config export and UI save flows.

FFUDevelopment/FFUUI.Core/FFUUI.Core.Config.psm1

@@ -727,7 +727,10 @@ function Invoke-SaveConfiguration {
             -DefaultExt ".json"
 
         if ($savePath) {
-            $config | ConvertTo-Json -Depth 10 | Set-Content -Path $savePath -Encoding UTF8
+            # Sort top-level keys alphabetically for consistent output
+            $sortedConfig = [ordered]@{}
+            foreach ($k in ($config.Keys | Sort-Object)) { $sortedConfig[$k] = $config[$k] }
+            $sortedConfig | ConvertTo-Json -Depth 10 | Set-Content -Path $savePath -Encoding UTF8
             [System.Windows.MessageBox]::Show("Configuration file saved to:`n$savePath", "Success", "OK", "Information")
         }
     }