feat(snapshots): Move ui_mode into sidecar tags block

Relocate the uiMode → light/dark mapping from the top-level
metadata field `color_mode` into the `tags` map, keyed as
`ui_mode`. This aligns the field with the other appearance
inputs (locale, device, font_scale, etc.) and matches the
ingestion schema's expectation that preview configuration
travels as tags rather than first-class metadata.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: runningcode

plugin-build/src/main/kotlin/io/sentry/android/gradle/snapshot/GenerateSnapshotTestsTask.kt

@@ -370,6 +370,10 @@ class $CLASS_NAME(
         if (info.heightDp > 0) tags["height_dp"] = info.heightDp
         if (info.showSystemUi) tags["show_system_ui"] = true
         if (info.showBackground) tags["show_background"] = true
+        when (info.uiMode and UI_MODE_NIGHT_MASK) {
+            UI_MODE_NIGHT_YES -> tags["ui_mode"] = "dark"
+            UI_MODE_NIGHT_NO -> tags["ui_mode"] = "light"
+        }
 
         val context = linkedMapOf<String, Any>(
             "image_file_name" to screenshotId,
@@ -382,11 +386,6 @@ class $CLASS_NAME(
         )
         if (info.group.isNotBlank()) metadata["group"] = info.group
 
-        when (info.uiMode and UI_MODE_NIGHT_MASK) {
-            UI_MODE_NIGHT_YES -> metadata["color_mode"] = "dark"
-            UI_MODE_NIGHT_NO -> metadata["color_mode"] = "light"
-        }
-
         val diffThreshold: Float? = runCatching {
             val declaring = Class.forName(preview.declaringClass)
             val method = declaring.declaredMethods.firstOrNull { it.name == preview.methodName }

plugin-build/src/test/kotlin/io/sentry/android/gradle/snapshot/GenerateSnapshotTestsTaskTest.kt

@@ -175,12 +175,12 @@ class GenerateSnapshotTestsTaskTest {
   }
 
   @Test
-  fun `generated sidecar maps night mode to color_mode enum`() {
+  fun `generated sidecar places ui_mode in tags block`() {
     val content = generateAndRead(packageTrees = listOf("com.example"))
 
     assertTrue(content.contains("when (info.uiMode and UI_MODE_NIGHT_MASK) {"))
-    assertTrue(content.contains("UI_MODE_NIGHT_YES -> metadata[\"color_mode\"] = \"dark\""))
-    assertTrue(content.contains("UI_MODE_NIGHT_NO -> metadata[\"color_mode\"] = \"light\""))
+    assertTrue(content.contains("UI_MODE_NIGHT_YES -> tags[\"ui_mode\"] = \"dark\""))
+    assertTrue(content.contains("UI_MODE_NIGHT_NO -> tags[\"ui_mode\"] = \"light\""))
   }
 
   @Test