build(android): update adaptive icon assets and background color

Update app icons and splash assets to match new branding, changing the
adaptive icon background color from light blue (#E6F4FE) to brand blue
(#0570F9) across all Android icon variants.

app.json

@@ -29,7 +29,7 @@
     },
     "android": {
       "adaptiveIcon": {
-        "backgroundColor": "#E6F4FE",
+        "backgroundColor": "#0570F9",
         "foregroundImage": "./assets/android-icon-foreground.png",
         "backgroundImage": "./assets/android-icon-background.png",
         "monochromeImage": "./assets/android-icon-monochrome.png"