Fix settings app variant fallback to match app.config resolution

Author: cursoragent

apps/mobile/src/features/settings/SettingsRouteScreen.tsx

@@ -425,7 +425,10 @@ function AppSettingsSection() {
   const icon = useThemeColor("--color-icon");
 
   const version = Constants.expoConfig?.version ?? "0.0.0";
-  const variant = (Constants.expoConfig?.extra?.appVariant as string | undefined) ?? "development";
+  // app.config.ts resolves unknown/missing APP_VARIANT to "production", so a
+  // missing value here must not be mislabeled as a development build.
+  const rawVariant = Constants.expoConfig?.extra?.appVariant;
+  const variant = typeof rawVariant === "string" ? rawVariant : "production";
   const variantLabel = variant === "production" ? "" : capitalize(variant);
   const versionLabel = variantLabel ? `${version} · ${variantLabel}` : version;
   // Which JS is actually running: the bundle shipped in the binary, or an OTA