chore: bump app version and update Android/iOS build tooling

- Bump version to 2026.0613.2+57
- Gradle wrapper 8.12 -> 8.14; Flutter migrator flags (builtInKotlin/newDsl)
  and relax kotlin.jvm.target.validation to warning for third-party plugins
- Refresh iOS Xcode project, scheme, Info.plist, Podfile.lock and SwiftPM
  Package.resolved

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

android/build.gradle.kts

@@ -16,6 +16,24 @@ subprojects {
     project.layout.buildDirectory.value(newSubprojectBuildDir)
 }
 subprojects {
+    // flutter_avif_android 3.1.0 (latest) ships duplicate Java and Kotlin
+    // copies of FlutterAvifPlugin. Kotlin 2.2+ rejects the redeclaration. The
+    // plugin's Java source dir contains only this redundant copy, so empty it
+    // and let the identical Kotlin implementation compile. kotlinc reads the
+    // module's Java source roots for joint compilation, so clearing srcDirs
+    // (rather than an exclude filter, which AGP doesn't forward to kotlinc) is
+    // what actually removes the duplicate from its view. Registered before
+    // evaluationDependsOn so it also covers :app, which that call evaluates
+    // eagerly.
+    afterEvaluate {
+        if (project.name == "flutter_avif_android") {
+            extensions.findByName("android")?.let { ext ->
+                (ext as com.android.build.gradle.BaseExtension)
+                    .sourceSets.getByName("main").java
+                    .setSrcDirs(emptyList<String>())
+            }
+        }
+    }
     project.evaluationDependsOn(":app")
 }