feat(android): the launch screen shows the padlock, not Delphi's flame

The launcher icon and the launch screen are different resources. On Android 12+ the theme points windowSplashScreenAnimatedIcon at splash_vector, which was Delphi's logo, over a #FFF background - a white flash before a dark app, every single launch.

Same padlock, drawn at 288 units with its content inside the central 192 the system guarantees. splash_background goes slate, in the light variant too since the app has only one theme. For Android 11 and earlier, which have no SplashScreen API and merely paint windowBackground, splash_image_def composes the background and the logo itself.

One source for the vector, copied onto the density and night variants by repack: four identical files in the repo would eventually diverge.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

android-client/android-res/drawable/splash_image_def.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Ecran de demarrage pour Android 11 et anterieurs, qui n'ont pas l'API
+     SplashScreen : le systeme se contente d'afficher windowBackground, donc
+     c'est ici qu'il faut composer fond + logo.
+     Remplace la version generee, qui centrait une image bitmap de Delphi. -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
+    android:opacity="opaque">
+    <item android:drawable="@color/splash_background" />
+    <item
+        android:gravity="center"
+        android:width="120dp"
+        android:height="120dp"
+        android:drawable="@drawable/splash_vector" />
+</layer-list>

android-client/android-res/drawable/splash_vector.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Icone de l'ecran de demarrage.
+     Sur Android 12+, le systeme l'affiche via windowSplashScreenAnimatedIcon
+     dans un disque de 288 unites dont il ne garantit que les 192 centrales :
+     le dessin ci-dessous occupe 101..187, bien a l'interieur.
+     C'est le meme cadenas que l'icone du lanceur, a l'echelle. -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="288dp"
+    android:height="288dp"
+    android:viewportWidth="288"
+    android:viewportHeight="288">
+    <path
+        android:strokeColor="#22D3EE"
+        android:strokeWidth="11"
+        android:strokeLineCap="round"
+        android:fillColor="#00000000"
+        android:pathData="M124,139 L124,121 A20,20 0 0 1 164,121 L164,139" />
+    <path
+        android:fillColor="#22D3EE"
+        android:pathData="M112,135 L176,135 A8,8 0 0 1 184,143 L184,179 A8,8 0 0 1 176,187 L112,187 A8,8 0 0 1 104,179 L104,143 A8,8 0 0 1 112,135 Z" />
+    <path
+        android:fillColor="#0F172A"
+        android:pathData="M144,151 m-8,0 a8,8 0 1,0 16,0 a8,8 0 1,0 -16,0 Z" />
+    <path
+        android:fillColor="#0F172A"
+        android:pathData="M140.4,159 L151.6,159 L149,174 L143,174 Z" />
+</vector>

android-client/android-res/values/colors.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Remplace le colors.xml genere, dont splash_background vaut #FFF : un
+     ecran de demarrage blanc suivi d'une application sombre donne un flash
+     desagreable a chaque lancement. -->
+<resources xmlns:android="http://schemas.android.com/apk/res/android">
+    <color name="splash_background">#0F172A</color>
+</resources>