Add custom Letterbox app icon with vector drawable and adaptive icon support

[Copilot]

Integrates the custom SVG icon as a vectorized Android adaptive icon following modern best practices, adds proprietary license exemption for the icon, and displays it prominently in the README.

Icon Integration

• Vector Drawable (res/drawable/ic_letterbox_foreground.xml): Converted SVG to Android's native XML format with all layers preserved
• Adaptive Icons (res/mipmap-anydpi-v26/ic_launcher.xml, ic_launcher_round.xml): Configured with white background, custom foreground, and monochrome layer for Android 13+ themed icons
• AndroidManifest: Updated android:icon and android:roundIcon to reference new mipmap resources

License & Documentation

• LICENSE: Added icon exemption section—icon remains proprietary, not covered by MIT
• README.md: Icon displayed at top with centered alignment; license note added
• docs/letterbox_icon.svg: Original SVG source preserved for reference

<!-- Adaptive icon with monochrome support (Android 13+) -->
<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
    <background android:drawable="@color/ic_launcher_background"/>
    <foreground android:drawable="@drawable/ic_letterbox_foreground"/>
    <monochrome android:drawable="@drawable/ic_letterbox_foreground"/>
</adaptive-icon>

Original prompt

I have designed an icon for the app and I want you to integrate this icon following all modern best practices. The current icon is SVG formatted and you should make it a vectorized icon for our Android app (follow modern android best practices). Please also update the LICENSE to add an exemption on the icon file - it is not part of the MIT license and should be excluded from the permissive open source license and remains proprietary to the author (me). Follow best practices, and also display this icon in the README prominently. Icon source code (SVG):

=== design docs ===

The short answer is yes, modern Android fully supports vector icons, but not by using the .svg file directly at runtime. Instead, the build system converts SVGs into Android's native XML-based format called Vector Drawable.

You do not need to manually convert your design to PNGs. In fact, using vector assets is the best practice for modern Android development because they are resolution-independent and result in smaller APK sizes.

Here is the modern workflow for using the icon we designed:

1. The Standard Workflow (Vector Asset Studio)

You cannot simply drop icon.svg into the drawable folder. You must import it so Android Studio can convert it to its XML format.

1. Save the SVG code I provided into a file named letterbox_icon.svg on your computer.
2. Open your project in Android Studio.
3. Right-click on res folder -> New -> Vector Asset.
4. Select "Local file (SVG, PSD)".
5. Browse to your letterbox_icon.svg.
6. Click Next then Finish.

What happens: Android Studio creates a file (e.g., ic_letterbox_foreground.xml) inside res/drawable/. This XML contains the pathData exactly like the SVG, but wrapped in <vector> tags instead of <svg>.

2. Using it as an Adaptive Icon

For your app icon specifically (ic_launcher), you configure the "Adaptive Icon" structure.

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

<?xml version="1.0" encoding="utf-8"?>
<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- This points to the white/color background -->
    <background android:drawable="@color/ic_launcher_background"/>
    
    <!-- This points to the vector XML we just imported -->
    <foreground android:drawable="@drawable/ic_letterbox_foreground"/>
</adaptive-icon>

3. Why not PNG?

• Scaling: A single Vector Drawable scales perfectly from a tiny watch screen to a massive tablet display. PNGs require you to generate 5+ versions (mdpi, hdpi, xhdpi, xxhdpi, xxxhdpi).
• Theming: Vector Drawables can be tinted programmatically. If you ever want to change the "Azure" color to "Red" for a debug build, you can just change one line of code or XML tint, whereas PNGs would require re-exporting all images.

Summary

• Do you need PNGs? No.
• Can you use .svg directly? No, you import it once to convert it to .xml (Vector Drawable).
• Is it "modern"? Yes, it is the standard for Android 5.0+ (API 21+).

I can provide the final Android XML code directly if you want to skip the import step and just paste it into a file. Would you like that?

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