feat(snapshots): Restructure sidecar JSON to match ingestion schema

[runningcode]

Summary

Aligns the per-snapshot sidecar JSON with the ingestion JSON Schema by organizing fields into the defined buckets:

• Top level: display_name, group, diff_threshold, color_mode
• tags (appearance / render inputs): preview_name, locale, device, font_scale, api_level, width_dp, height_dp, show_system_ui, show_background
• context (preview identity / location): image_file_name, class_name, method_name

Notable behavior changes:

• The old night_mode boolean is replaced by a color_mode enum. It is emitted only when the @Preview(uiMode = …) bits explicitly set UI_MODE_NIGHT_YES → "dark" or UI_MODE_NIGHT_NO → "light". The common UI_MODE_NIGHT_UNDEFINED case (which is the default for unannotated previews) now yields no color_mode key.
• preview_name (the @Preview(name = …) label) moves from top level into tags.
• tags is omitted when empty; context is always present.

Implementation notes:

• The sidecar writer is emitted as a string literal inside the generated Paparazzi test (GenerateSnapshotTestsTask.kt), so the change lives in that template.
• The hand-rolled JSON writer is replaced with a tiny recursive renderJson(value, indentLevel) that handles String, Number, Boolean, and Map<*,*> — no new dependencies.

Example output:

{
  "display_name": "FooPreview",
  "group": "main",
  "color_mode": "dark",
  "tags": { "preview_name": "Dark", "locale": "en", "font_scale": 1.5 },
  "context": {
    "image_file_name": "com.example.FooPreview",
    "class_name": "com.example.Foo",
    "method_name": "FooPreview"
  }
}

#skip-changelog

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## Unreleased

### Features

- Restructure sidecar JSON to match ingestion schema ([#1162](https://github.com/getsentry/sentry-android-gradle-plugin/pull/1162))

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[rbro112]

Make sure to pass this through as uiMode in context

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

Night mode field has wrong name and wrong placement

High Severity

The dark/light value is placed in tags under the key ui_mode, but the PR description and example JSON clearly define it as color_mode at the top level of the metadata (alongside display_name, group, diff_threshold). Additionally, the reviewer asks for the raw uiMode to be passed through in the context block, which is also not done. Both the field name and its location contradict the ingestion schema this PR is designed to match.

Additional Locations (1)

• plugin-build/src/test/kotlin/io/sentry/android/gradle/snapshot/GenerateSnapshotTestsTaskTest.kt#L177-L184

 

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