Read the subheader locale observably to satisfy lint

Reading Locale.getDefault() in a composable trips lint's NonObservableLocale
(the header wouldn't recompose on a locale change). Read the locale from
LocalConfiguration via ConfigurationCompat instead, matching the existing
stats-card pattern, keeping the locale-aware uppercase.

Author: nbradbury

WordPress/src/main/java/org/wordpress/android/ui/commentsrs/screens/CommentsRsListItem.kt

@@ -29,13 +29,15 @@ import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.vector.rememberVectorPainter
 import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.text.SpanStyle
 import androidx.compose.ui.text.buildAnnotatedString
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
+import androidx.core.os.ConfigurationCompat
 import coil.compose.AsyncImage
 import org.wordpress.android.R
 import org.wordpress.android.ui.commentsrs.CommentRsUiModel
@@ -178,10 +180,12 @@ private fun AnnotatedString.Builder.boldRange(formatted: String, part: String) {
 /** A date-group subheader row, matching the legacy list's all-caps overline separators. */
 @Composable
 fun CommentsRsDateHeader(label: String, modifier: Modifier = Modifier) {
+    // Locale-aware uppercase, like the legacy subheader's android:textAllCaps (Kotlin's no-arg
+    // uppercase() is Locale.ROOT and would mis-case e.g. Turkish month names). Read the locale
+    // observably from the composition so it tracks locale changes.
+    val locale = ConfigurationCompat.getLocales(LocalConfiguration.current)[0] ?: Locale.ROOT
     Text(
-        // Locale-aware uppercase, like the legacy subheader's android:textAllCaps (Kotlin's no-arg
-        // uppercase() is Locale.ROOT and would mis-case e.g. Turkish month names).
-        text = label.uppercase(Locale.getDefault()),
+        text = label.uppercase(locale),
         style = MaterialTheme.typography.labelMedium,
         color = MaterialTheme.colorScheme.onSurfaceVariant,
         maxLines = 1,