feat: set kisani app icon (server.rack, black bg, white icon)

Generated at 9 sizes for iPhone home screen and App Store (1024px).
White server.rack SF Symbol on black rounded bg — matches in-app logo.

Co-Authored-By: Kutesir <kutesir@provoc.ug>
Co-Authored-By: Sentry <sentry@provoc.ug>

Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -1,8 +1,14 @@
 {
   "images" : [
-    { "idiom" : "universal", "platform" : "ios", "scale" : "1x" },
+    { "filename" : "Icon-20@2x.png",  "idiom" : "iphone", "scale" : "2x", "size" : "20x20" },
-    { "idiom" : "universal", "platform" : "ios", "scale" : "2x" },
+    { "filename" : "Icon-20@3x.png",  "idiom" : "iphone", "scale" : "3x", "size" : "20x20" },
-    { "idiom" : "universal", "platform" : "ios", "scale" : "3x" }
+    { "filename" : "Icon-29@2x.png",  "idiom" : "iphone", "scale" : "2x", "size" : "29x29" },
+    { "filename" : "Icon-29@3x.png",  "idiom" : "iphone", "scale" : "3x", "size" : "29x29" },
+    { "filename" : "Icon-40@2x.png",  "idiom" : "iphone", "scale" : "2x", "size" : "40x40" },
+    { "filename" : "Icon-40@3x.png",  "idiom" : "iphone", "scale" : "3x", "size" : "40x40" },
+    { "filename" : "Icon-60@2x.png",  "idiom" : "iphone", "scale" : "2x", "size" : "60x60" },
+    { "filename" : "Icon-60@3x.png",  "idiom" : "iphone", "scale" : "3x", "size" : "60x60" },
+    { "filename" : "Icon-1024.png",   "idiom" : "ios-marketing", "scale" : "1x", "size" : "1024x1024" }
   ],
   "info" : {
     "author" : "xcode",