Bump versionCode to 6; docs: versionCode bump required for Play uploads

DEVELOPMENT.md

@@ -25,6 +25,11 @@
 
 ## Create an AAB (CLI)
 
+Before uploading a new AAB to Google Play, make sure the app version is bumped:
+
+- `app/build.gradle.kts` → `defaultConfig.versionCode` must be **unique and increasing** on Play Console.
+- Update `versionName` as your human-readable release string.
+
 From the repo root:
 
 ```bash

app/build.gradle.kts

@@ -13,8 +13,8 @@ android {
         applicationId = "solutions.tretter.mindmachine"
         minSdk = 26
         targetSdk = 35
-        versionCode = 5
+        versionCode = 6
-        versionName = "1.0"
+        versionName = "1.0.1"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }