chore: add Android project files to version control

Adds build config, Gradle wrapper, resources, and gitignore.
Kotlin sources, manifests and app build.gradle were already tracked.
Excludes build output, .gradle cache, .idea, local.properties, and release APK.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

android/app/src/main/res/drawable/ic_launcher.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="#1a1a2e"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#e040fb"
+        android:pathData="M54,27v23.24c-1.33-0.78-2.87-1.24-4.5-1.24C44.81,49,41,52.81,41,57.5S44.81,66,49.5,66S58,62.19,58,57.5V36h9V27H54z" />
+</vector>

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

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="@android:color/white">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M12,3v10.55c-0.59-0.34-1.27-0.55-2-0.55c-2.21,0-4,1.79-4,4s1.79,4,4,4s4-1.79,4-4V7h4V3h-6z" />
+</vector>

android/app/src/main/res/layout/activity_main.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="#000000">
+
+    <WebView
+        android:id="@+id/web_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+</FrameLayout>

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

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">NovaSonic</string>
+</resources>

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

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.NovaSonic" parent="Theme.AppCompat.NoActionBar">
+        <item name="android:windowBackground">@android:color/black</item>
+        <item name="android:statusBarColor">@android:color/black</item>
+        <item name="android:navigationBarColor">@android:color/black</item>
+    </style>
+</resources>

android/app/src/main/res/xml/automotive_app_desc.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<automotiveApp>
+    <uses name="media" />
+</automotiveApp>

android/app/src/main/res/xml/network_security_config.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Allow HTTP for self-hosted NovaSonic/Navidrome on local network -->
+<network-security-config>
+    <base-config cleartextTrafficPermitted="true">
+        <trust-anchors>
+            <certificates src="system" />
+        </trust-anchors>
+    </base-config>
+</network-security-config>