Goldens: three variants at 1x density (sv_light, sv_dark, en_light; D-098)

Drop the en_dark variant from every screenshot helper and render every
golden at mdpi (Robolectric qualifier w411dp-h<height>dp-mdpi instead of
xhdpi/xxhdpi), so a 411 x 891 dp screen is 411 x 891 px. All goldens
deleted and re-recorded; 1143 -> 865 PNGs. README describes the layout.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B

android/core/design/src/test/kotlin/se/hagstedt/kvitt/design/screenshot/ComponentScreenshotTest.kt

@@ -17,7 +17,7 @@ import se.hagstedt.kvitt.design.catalogue.LargeFontSheets
  */
 @RunWith(ParameterizedRobolectricTestRunner::class)
 @GraphicsMode(GraphicsMode.Mode.NATIVE)
-@Config(sdk = [36], qualifiers = "w411dp-h2400dp-xxhdpi")
+@Config(sdk = [36], qualifiers = "w411dp-h2400dp-mdpi")
 class ComponentScreenshotTest(private val sheet: String) {
     @get:Rule
     val compose = createComposeRule()

android/core/design/src/test/kotlin/se/hagstedt/kvitt/design/screenshot/Snapshots.kt

@@ -36,7 +36,7 @@ import java.util.Locale
 import kotlin.time.Instant
 
 /**
- * Captures one golden per theme and language: `src/test/screenshots/<name>_<sv|en>_<light|dark>.png`, plus
+ * Captures three goldens (Swedish light and dark, English light; D-098): `src/test/screenshots/<name>_<sv_light|sv_dark|en_light>.png`, plus
  * `<name>_sv_light_200.png` when `largeFont` is set (200 % font scale, Swedish and light, like the spec's 200 % frames).
  * The content is set once; language (configuration, resources), theme and font scale (the platform's non-linear
  * scaling, from a configuration context) switch between captures. Width: the Galaxy S26, 411 dp (SPEC §13.1). The
@@ -50,7 +50,7 @@ object Snapshots {
     }
 
     fun snap(compose: ComposeContentTestRule, name: String, largeFont: Boolean, content: @Composable ColumnScope.() -> Unit) {
-        val variants = listOf("sv", "en").flatMap { l -> listOf(false, true).map { Variant(l, it, 1f) } } +
+        val variants = listOf(Variant("sv", dark = false, fontScale = 1f), Variant("sv", dark = true, fontScale = 1f), Variant("en", dark = false, fontScale = 1f)) +
             if (largeFont) listOf(Variant("sv", dark = false, fontScale = 2f)) else emptyList()
         var current by mutableStateOf(variants.first())
         compose.setContent {