feat: Phase 28.1 — gradle wrapper + debug APK builds successfully

- gradlew + gradle-wrapper.jar (Gradle 8.11.1)
- Fixed manifest icon to @android:mipmap/sym_def_app_icon (no custom asset needed yet)
- Added adaptive icon XML + colors for future custom icon
- Removed deprecated buildfeatures.buildconfig from gradle.properties
- 17MB debug APK builds: ./gradlew assembleDebug
- local.properties auto-ignored (contains SDK path)

android/app/src/main/AndroidManifest.xml

@@ -20,7 +20,7 @@
         android:name=".YarisApp"
         android:allowBackup="false"
         android:fullBackupOnly="false"
-        android:icon="@mipmap/ic_launcher"
+        android:icon="@android:mipmap/sym_def_app_icon"
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/Theme.YarisOBD"

android/app/src/main/res/drawable/ic_launcher_foreground.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#4CAF50"
+        android:pathData="M54,54m-40,0a40,40 0,1 1,80 0a40,40 0,1 1,-80 0"/>
+    <path
+        android:fillColor="#121212"
+        android:pathData="M40,45 L68,54 L40,63 Z"/>
+</vector>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@color/ic_launcher_foreground"/>
+</adaptive-icon>

android/app/src/main/res/values/colors.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#121212</color>
+    <color name="ic_launcher_foreground">#4CAF50</color>
+</resources>