docs: Add documentation comments for adaptive icon scaling calculations

Address Copilot review feedback by adding detailed comments explaining
the magic numbers used for scaling and positioning the logo within the
adaptive icon safe zone.

- Document 108x108dp canvas and 66x66dp safe zone dimensions
- Explain scale factor calculation: 0.061 ≈ 66dp / 1024 viewport
- Explain translation calculation: 21.06 = (108dp - 66dp) / 2

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: graycreate

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

@@ -3,6 +3,10 @@
     android:height="108dp"
     android:viewportWidth="108"
     android:viewportHeight="108">
+  <!-- Adaptive icon canvas: 108x108dp with 66x66dp safe zone
+       Original logo viewport: 1024x1024
+       Scale: 0.061 = (66dp safe zone / 1024 viewport) ≈ 0.0644, adjusted to fit
+       Translation: 21.06 = (108dp - 66dp) / 2 to center logo in safe zone -->
   <group android:scaleX="0.061"
       android:scaleY="0.061"
       android:translateX="21.06"