fix(example): remove splash screen, enlarge adaptive icon foreground

Drop the custom splash image — modern Expo handles splash via the app
icon automatically. Increase the adaptive icon foreground from 55% to
75% of the canvas so it fills the Android safe zone properly.

Author: janicduplessis

example/app.json

@@ -7,11 +7,6 @@
     "scheme": "ease-example",
     "version": "1.0.0",
     "icon": "./assets/icon.png",
-    "splash": {
-      "image": "./assets/splash.png",
-      "resizeMode": "cover",
-      "backgroundColor": "#1a1a2e"
-    },
     "plugins": [
       [
         "expo-router",