fix: splash screen now loads via JarvisIcon imageset (UIImage named: AppIcon doesn't resolve at runtime)

Added JarvisIcon.imageset containing the radar PNG so Image("JarvisIcon")
loads reliably. Also switched shadow tint to orange to echo the icon glow.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Jarvis/Assets.xcassets/JarvisIcon.imageset/Contents.json

@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "filename" : "JarvisIcon.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}