ExternalGpsSection: match Flic section's headline font

Drops the inlined titleMedium Text in favor of the existing SectionHeader
helper (headlineMedium, primary colour, search-highlight aware). The
helper was file-private to SettingsScreen.kt; relaxed to internal so
sibling settings components can reuse it without duplicating the style.

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

Author: eried

app/src/main/java/com/eried/eucplanet/ui/settings/ExternalGpsSection.kt

@@ -49,11 +49,7 @@ fun ExternalGpsSection(viewModel: ExternalGpsViewModel = hiltViewModel()) {
     val sample by viewModel.currentSample.collectAsState()
 
     Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
-        Text(
-            stringResource(R.string.section_external_gps),
-            style = MaterialTheme.typography.titleMedium,
-            color = MaterialTheme.colorScheme.primary
-        )
+        SectionHeader(stringResource(R.string.section_external_gps))
         HintText(stringResource(R.string.external_gps_caption), small = true)
 
         if (pairedAddress == null) {

app/src/main/java/com/eried/eucplanet/ui/settings/SettingsScreen.kt

@@ -1355,7 +1355,7 @@ private fun AnnounceSwitchSetting(
 }
 
 @Composable
-private fun SectionHeader(title: String) {
+internal fun SectionHeader(title: String) {
     val query = LocalSettingsSearchQuery.current
     Text(
         text = highlightMatches(title, query),