fix: give road event comment an explicit on-surface color

The comment Text inherited LocalContentColor, which resolved to a
near-white in this card and made the report content hard to read on the
light map card. Color it onSurface so it stays readable in both themes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017tYbcy4UGWxqQbcycyL7Yd

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/types/RoadEvent.kt

@@ -226,6 +226,7 @@ private fun RoadEventCard(
                     Text(
                         text = comment,
                         style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onSurface,
                         maxLines = 4,
                         overflow = TextOverflow.Ellipsis,
                     )