Initial commit: Pezkuwi Wallet Android

Security hardened release:
- Code obfuscation enabled (minifyEnabled=true, shrinkResources=true)
- Sensitive files excluded (google-services.json, keystores)
- Branch.io key moved to BuildConfig placeholder
- Updated dependencies: OkHttp 4.12.0, Gson 2.10.1, BouncyCastle 1.77
- Comprehensive ProGuard rules for crypto wallet
- Navigation 2.7.7, Lifecycle 2.7.0, ConstraintLayout 2.1.4

common/src/main/res/drawable/ic_tab_close.xml

@@ -0,0 +1,13 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+  <path
+      android:pathData="M12,2L12,2A10,10 0,0 1,22 12L22,12A10,10 0,0 1,12 22L12,22A10,10 0,0 1,2 12L2,12A10,10 0,0 1,12 2z"
+      android:fillColor="#B4B5BF"/>
+  <path
+      android:pathData="M13.081,12L16.107,8.974C16.251,8.831 16.331,8.636 16.332,8.433C16.332,8.23 16.251,8.035 16.108,7.892C15.965,7.748 15.77,7.667 15.567,7.667C15.364,7.667 15.17,7.748 15.026,7.891L12,10.917L8.974,7.891C8.83,7.747 8.636,7.667 8.432,7.667C8.229,7.667 8.035,7.747 7.891,7.891C7.747,8.035 7.667,8.229 7.667,8.432C7.667,8.636 7.747,8.83 7.891,8.974L10.917,12L7.891,15.026C7.747,15.17 7.667,15.364 7.667,15.568C7.667,15.771 7.747,15.965 7.891,16.109C8.035,16.253 8.229,16.333 8.432,16.333C8.636,16.333 8.83,16.253 8.974,16.109L12,13.083L15.026,16.109C15.17,16.253 15.364,16.333 15.568,16.333C15.771,16.333 15.965,16.253 16.109,16.109C16.253,15.965 16.333,15.771 16.333,15.568C16.333,15.364 16.253,15.17 16.109,15.026L13.081,12Z"
+      android:fillColor="#000000"
+      android:fillAlpha="0.48"/>
+</vector>