fix: bump Android mobile versionCode

Agent-Logs-Url: https://github.com/we-promise/sure/sessions/c7b35fa9-a638-489b-803f-a935ccd7a301

Co-authored-by: jjmata <187772+jjmata@users.noreply.github.com>

mobile/README.md

@@ -172,6 +172,8 @@ flutter build apk --release
 flutter build appbundle --release
 ```
 
+Android release metadata comes from `pubspec.yaml` (`version: <name>+<code>`). Keep the numeric build code increasing for every release so Android can install upgrades over older APKs.
+
 ### iOS
 
 ```bash

mobile/pubspec.yaml

@@ -1,7 +1,7 @@
 name: sure_mobile
 description: A mobile app for Sure personal finance management
 publish_to: 'none'
-version: 0.6.9+9
+version: 0.6.9+12
 
 environment:
   sdk: '>=3.0.0 <4.0.0'

mobile/test/versioning_test.dart

@@ -0,0 +1,25 @@
+import 'dart:io';
+
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  test('Android versionCode stays above the last published release', () {
+    final pubspec = File('pubspec.yaml').readAsStringSync();
+    final versionMatch = RegExp(r'^version:\s*([^\s]+)$', multiLine: true).firstMatch(pubspec);
+
+    expect(versionMatch, isNotNull);
+
+    final version = versionMatch!.group(1)!;
+    final versionParts = version.split('+');
+
+    expect(versionParts.length, 2);
+
+    final versionCode = int.parse(versionParts[1]);
+
+    expect(
+      versionCode,
+      greaterThan(11),
+      reason: 'Android upgrades require monotonically increasing versionCode values; v0.6.8 shipped with versionCode 11.',
+    );
+  });
+}