paparazzi: add a test for month header

paparazzi-tests/src/test/kotlin/dev/msfjarvis/claw/android/tests/MonthHeaderTest.kt

@@ -0,0 +1,28 @@
+package dev.msfjarvis.claw.android.tests
+
+import androidx.compose.material3.MaterialTheme
+import app.cash.paparazzi.Paparazzi
+import dev.msfjarvis.claw.android.ui.decorations.MonthHeader
+import dev.msfjarvis.claw.common.theme.DarkThemeColors
+import dev.msfjarvis.claw.common.theme.LightThemeColors
+import java.time.Month
+import org.junit.Rule
+import org.junit.Test
+
+class MonthHeaderTest {
+  @get:Rule val paparazzi = Paparazzi()
+
+  @Test
+  fun light_mode() {
+    paparazzi.snapshot {
+      MaterialTheme(colorScheme = LightThemeColors) { MonthHeader(Month.APRIL) }
+    }
+  }
+
+  @Test
+  fun dark_mode() {
+    paparazzi.snapshot {
+      MaterialTheme(colorScheme = DarkThemeColors) { MonthHeader(Month.JANUARY) }
+    }
+  }
+}