fix(android): replace deprecated kotlinOptions with kotlin{compilerOptions}

`kotlinOptions { jvmTarget = "17" }` inside the `android { }` block was
removed in newer Kotlin tooling; replaced with the modern top-level
`kotlin { compilerOptions { jvmTarget.set(JvmTarget.JVM_17) } }` form.

Required after the Kotlin 2.2 + AGP 9 bump; the old DSL was tolerated
through AGP 8.7 + Kotlin 2.0 but not through AGP 9's built-in Kotlin.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

android/app/build.gradle.kts

@@ -62,7 +62,6 @@ android {
         sourceCompatibility = JavaVersion.VERSION_17
         targetCompatibility = JavaVersion.VERSION_17
     }
-    kotlinOptions { jvmTarget = "17" }
 
     buildFeatures {
         compose = true
@@ -78,6 +77,16 @@ android {
     }
 }
 
+// Kotlin 2.x: `kotlinOptions { ... }` inside `android { }` is gone; the
+// modern shape is the top-level `kotlin { compilerOptions { ... } }` block,
+// which works whether Kotlin comes from AGP 9's built-in path or an
+// explicit plugin alias.
+kotlin {
+    compilerOptions {
+        jvmTarget.set(org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17)
+    }
+}
+
 detekt {
     toolVersion = libs.versions.detekt.get()
     config.setFrom(files("$rootDir/config/detekt.yml"))