fix: ASCII-safe tab icons + yaris-obd branding on Settings

- Tab icons: Cam / DL / Set (Unicode emoji kept corrupting in the source file)
- Settings top: yaris-obd title + Phase 28 subtitle restored

android/app/src/main/java/com/yarisobd/app/MainActivity.kt

@@ -77,19 +77,19 @@ fun YarisMainScreen(client: OkHttpClient) {
                 NavigationBarItem(
                     selected = selectedTab == 0,
                     onClick = { selectedTab = 0 },
-                    icon = { Text("📹") },
+                    icon = { Text("Cam") },
                     label = { Text("Dashcam") }
                 )
                 NavigationBarItem(
                     selected = selectedTab == 1,
                     onClick = { selectedTab = 1 },
-                    icon = { Text(".") },
+                    icon = { Text("DL") },
                     label = { Text("Downloads") }
                 )
                 NavigationBarItem(
                     selected = selectedTab == 2,
                     onClick = { selectedTab = 2 },
-                    icon = { Text(".") },
+                    icon = { Text("Set") },
                     label = { Text("Settings") }
                 )
             }

android/app/src/main/java/com/yarisobd/app/SettingsScreen.kt

@@ -49,9 +49,10 @@ fun SettingsScreen(client: OkHttpClient) {
     Column(
         modifier = Modifier.fillMaxSize().verticalScroll(rememberScrollState()).padding(16.dp)
     ) {
-        Text("Settings", style = MaterialTheme.typography.titleLarge, color = MaterialTheme.colorScheme.primary)
+        Text("yaris-obd", style = MaterialTheme.typography.headlineLarge, color = MaterialTheme.colorScheme.primary)
+        Text("Phase 28 — Android Companion", style = MaterialTheme.typography.bodySmall, color = MaterialTheme.colorScheme.onSurfaceVariant)
 
-        Spacer(Modifier.height(16.dp))
+        Spacer(Modifier.height(20.dp))
 
         // Server credentials
         Card(