chore(native): bump build number to 4 for staging release

iOS buildNumber: 3 → 4
Android versionCode: 3 → 4
version stays 0.1.0 (no breaking changes, MVP phase)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/rebreak-native/app.config.ts

@@ -20,7 +20,7 @@ export default ({ config }: ConfigContext): ExpoConfig => ({
   ios: {
     supportsTablet: true,
     bundleIdentifier: "org.rebreak.app",
-    buildNumber: "3",
+    buildNumber: "4",
     config: {
       usesNonExemptEncryption: false,
     },
@@ -39,7 +39,7 @@ export default ({ config }: ConfigContext): ExpoConfig => ({
 
   android: {
     package: "org.rebreak.app",
-    versionCode: 3,
+    versionCode: 4,
     adaptiveIcon: {
       // Foreground muss in der ~66%-Safe-Zone bleiben (Launcher-Mask clippt den
       // Außenring) → adaptive-foreground.png ist das Logo auf transparentem