feat: implement splash and onboarding flows, update app assets, and add project design documentation

apps/rider/pubspec.yaml

@@ -30,7 +30,7 @@ dependencies:
 
   # الخرائط: SDK انطلق حصراً (docs/23 §6) — يُصدِّر LatLng/Marker/Polyline
   # بنفسه. لا flutter_map ولا latlong2 (نوعا LatLng متضاربان).
-  intaleq_maps: ^2.2.0
+  intaleq_maps: ^2.2.1
 
   # الموقع: جلب موقع المستخدم الحالي (Phase 1 — الخرائط وحساب المسار)
   geolocator: ^14.0.0
@@ -55,7 +55,8 @@ dev_dependencies:
 flutter_launcher_icons:
   android: "launcher_icon"
   ios: true
-  image_path: "assets/images/logo.png"
+  remove_alpha_ios: true
+  image_path: "assets/images/splash_logo.png"
   min_sdk_android: 21
 
 flutter:
@@ -90,7 +91,7 @@ flutter:
 
 flutter_native_splash:
   color: "#FFFFFF"
-  image: "assets/images/logo.png"
+  image: "assets/images/splash_logo.png"
   android_12:
-    image: "assets/images/logo.png"
+    image: "assets/images/splash_logo.png"
     icon_background_color: "#FFFFFF"