feat(flutter): update UI theme to monochrome with eagle watermark

ostp-flutter/lib/main.dart

@@ -26,11 +26,11 @@ class OstpApp extends StatelessWidget {
       debugShowCheckedModeBanner: false,
       theme: ThemeData(
         brightness: Brightness.dark,
-        scaffoldBackgroundColor: const Color(0xFF08080F),
+        scaffoldBackgroundColor: const Color(0xFF000000),
         colorScheme: const ColorScheme.dark(
-          primary: Color(0xFF6C72FF),
-          secondary: Color(0xFF22D3A5),
-          surface: Color(0xFF151522),
+          primary: Color(0xFFFFFFFF),
+          secondary: Color(0xFFAAAAAA),
+          surface: Color(0xFF111111),
         ),
         fontFamily: 'Inter',
         useMaterial3: true,

ostp-flutter/lib/ui/home_screen.dart

@@ -479,31 +479,15 @@ class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
     return Scaffold(
       body: Stack(
         children: [
-          Positioned(
-            top: -150, right: -100,
-            child: Container(
-              width: 400, height: 400,
-              decoration: BoxDecoration(
-                shape: BoxShape.circle,
-                color: theme.colorScheme.primary.withOpacity(0.15),
+          Positioned.fill(
+            child: Opacity(
+              opacity: 0.03,
+              child: Center(
+                child: Image.asset(
+                  'assets/logo.png',
+                  width: MediaQuery.of(context).size.shortestSide * 0.6,
+                  color: Colors.white,
                 ),
-              child: BackdropFilter(
-                filter: ImageFilter.blur(sigmaX: 100, sigmaY: 100),
-                child: Container(),
-              ),
-            ),
-          ),
-          Positioned(
-            bottom: -100, left: -100,
-            child: Container(
-              width: 350, height: 350,
-              decoration: BoxDecoration(
-                shape: BoxShape.circle,
-                color: theme.colorScheme.secondary.withOpacity(0.1),
-              ),
-              child: BackdropFilter(
-                filter: ImageFilter.blur(sigmaX: 100, sigmaY: 100),
-                child: Container(),
               ),
             ),
           ),

ostp-flutter/pubspec.yaml

@@ -72,9 +72,8 @@ flutter:
   uses-material-design: true
 
   # To add assets to your application, add an assets section, like this:
-  # assets:
-  #   - images/a_dot_burr.jpeg
-  #   - images/a_dot_ham.jpeg
+  assets:
+    - assets/logo.png
 
   # An image asset can refer to one or more resolution-specific "variants", see
   # https://flutter.dev/to/resolution-aware-images