chore: migrates Newtonsoft.Json to System.Text.Json

[United600]

Works perfectly fine on both Debug and Release builds, but I still have some concerns about the Store build. @rocksdanister Can you take a look and confirm that there are no regressions or hidden edge cases?

Followed the steps in this guide.

[Copilot]

Pull Request Overview

This PR migrates the codebase from Newtonsoft.Json to System.Text.Json following Microsoft's migration guide. The change aims to improve performance and reduce dependencies by using the built-in JSON serialization library.

Key changes:

• Replaced Newtonsoft.Json with System.Text.Json imports across affected files
• Updated JSON parsing logic to use JsonDocument and JsonElement APIs
• Modified serialization calls to use JsonSerializer instead of JsonConvert

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
LivelyWallpaperPlayerViewModel.cs	Updated JSON parsing logic for wallpaper properties and replaced serialization calls
LivelyWallpaperService.cs	Replaced deserialization calls for LivelyInfoModel
WebView2Util.cs	Updated parameter serialization in script execution helper

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[rocksdanister]

In Lively I am using JsonConverter now.

Here that maybe overkill, don't have experience with System.Text.Json but LivelyProperties.json is designed with backward compatibility in mind - will not have required properties missing (unless the wallpaper itself is bad) and existing properties are not changed in future update.. so the checks are probably not necessary.

LivelyInfo.json can have missing fields depending on how and when its created but here we are deserializing so should be fine, its specification won't change in the future besides adding new properties.

[United600]

Thanks for the info. It should work fine, but I’m still mildly concerned about .Net Native support for System.Text.Json.

[rocksdanister]

You can verify by running with .NET Native in debug mode with this wallpaper (which I use for testing myself):
Property API Test.zip

[United600]

You can verify by running with .NET Native in debug mode with this wallpaper (which I use for testing myself): Property API Test.zip

The info looks correct but can't verify the properties. Debug and Release mode aren't really my concern.

[rocksdanister]

The info looks correct but can't verify the properties.

Just remove the music wallpaper check and run the wallpaper as visualizer.

Screenbox/Screenbox.Core/Services/LivelyWallpaperService.cs

Line 46 in 3ac83ff

if (!model.IsLocalWebWallpaper() || !model.IsMusicWallpaper())

[United600]

Correct again, but the app hangs after clicking Continue on the breakpoint (which I assume is expected).

Gravacao.2025-09-15.204929.mp4