brand: add Hope app icon (Lightwell aperture)

- 1024px icon from web/brand/hope-icon.svg (forced-dark, grid-tuned)
- fix xcodegen: xcassets was never in the generated project (no
  resources phase) — move it into sources with buildPhase: resources
- fix iconset manifest: idiom universal (universal-platform rejected
  by actool), single 1024 universal/ios entry

Resources/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -1,7 +1,8 @@
 {
   "images" : [
     {
-      "idiom" : "universal-platform",
+      "filename" : "AppIcon-1024.png",
+      "idiom" : "universal",
       "platform" : "ios",
       "size" : "1024x1024"
     }