P1 Stream B: port iOS brand assets to Android

- outline, tab_view, app_icon_mark, widget_icon: rasterized from iOS
  PDF/PNG sources at 1024px (gradients/shadows would flatten via SVG trace)
- honeycomb_texture: hand-authored VectorDrawable, seamless hex tiling
  verified at 4x4 render
- widget_icon: adaptive icon (mipmap-anydpi-v26) + density-specific
  mipmap + foreground bitmaps (mdpi..xxxhdpi)
- Source PDFs preserved in docs/ios-parity/source-assets/ for future
  re-rasterization

AssetInventoryTest asserts all 5 Res.drawable entries resolve.

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

composeApp/src/androidMain/res/drawable/widget_icon_background.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Adaptive icon background for widget_icon.
+  Matches iOS AppIcon dark navy tone (#0A1929 app background primary dark).
+-->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="#0A1929" />
+</shape>