feat: Implement update checker and dialog for available app updates with localization support

android/app/build.gradle.kts

@@ -10,6 +10,11 @@ android {
     compileSdk = flutter.compileSdkVersion
     ndkVersion = flutter.ndkVersion
 
+    // Enable BuildConfig generation
+    buildFeatures {
+        buildConfig = true
+    }
+
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_11
         targetCompatibility = JavaVersion.VERSION_11
@@ -31,6 +36,11 @@ android {
         targetSdk = flutter.targetSdkVersion
         versionCode = flutter.versionCode
         versionName = flutter.versionName
+
+        // Inject commit hash from environment variable (set by GitHub Actions)
+        // Falls back to "dev" for local development builds
+        val commitHash = System.getenv("COMMIT_HASH") ?: "dev"
+        buildConfigField("String", "COMMIT_HASH", "\"$commitHash\"")
     }
 
     buildTypes {

android/app/src/main/kotlin/com/meshcore/sar/meshcore_sar_app/BuildInfoChannel.kt

@@ -0,0 +1,35 @@
+package com.meshcore.sar.meshcore_sar_app
+
+import io.flutter.plugin.common.MethodCall
+import io.flutter.plugin.common.MethodChannel
+import io.flutter.plugin.common.MethodChannel.MethodCallHandler
+import io.flutter.plugin.common.MethodChannel.Result
+
+/**
+ * Platform channel for exposing build information to Flutter
+ * Provides access to BuildConfig values that are injected at build time
+ */
+class BuildInfoChannel : MethodCallHandler {
+    companion object {
+        const val CHANNEL_NAME = "com.meshcore.sar/build_info"
+        const val METHOD_GET_COMMIT_HASH = "getCommitHash"
+    }
+
+    override fun onMethodCall(call: MethodCall, result: Result) {
+        when (call.method) {
+            METHOD_GET_COMMIT_HASH -> {
+                try {
+                    // Get commit hash from BuildConfig
+                    // This value is injected by gradle at build time
+                    val commitHash = BuildConfig.COMMIT_HASH
+                    result.success(commitHash)
+                } catch (e: Exception) {
+                    result.error("BUILD_INFO_ERROR", "Failed to get commit hash: ${e.message}", null)
+                }
+            }
+            else -> {
+                result.notImplemented()
+            }
+        }
+    }
+}

android/app/src/main/kotlin/com/meshcore/sar/meshcore_sar_app/MainActivity.kt

@@ -1,5 +1,17 @@
 package com.meshcore.sar.meshcore_sar_app
 
 import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodChannel
 
-class MainActivity : FlutterActivity()
+class MainActivity : FlutterActivity() {
+    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+        super.configureFlutterEngine(flutterEngine)
+
+        // Register BuildInfoChannel to expose build information to Flutter
+        MethodChannel(
+            flutterEngine.dartExecutor.binaryMessenger,
+            BuildInfoChannel.CHANNEL_NAME
+        ).setMethodCallHandler(BuildInfoChannel())
+    }
+}