Feat: Login Screen design

lib/config/themes.dart

@@ -3,7 +3,7 @@ import 'package:flutter/material.dart';
 class AppThemes {
   // Private constructor to prevent instantiation
   AppThemes._();
-  
+
   // Light theme colors
   static const Color _primaryColorLight = Color(0xFF1E88E5); // Blue 600
   static const Color _secondaryColorLight = Color(0xFF26A69A); // Teal 400
@@ -22,51 +22,61 @@ class AppThemes {
       fontSize: 96,
       fontWeight: FontWeight.w300,
       color: Color(0xFF212121),
+      fontFamily: 'Rubik',
     ),
     displayMedium: TextStyle(
       fontSize: 60,
       fontWeight: FontWeight.w300,
       color: Color(0xFF212121),
+      fontFamily: 'Rubik',
     ),
     displaySmall: TextStyle(
       fontSize: 48,
       fontWeight: FontWeight.w400,
       color: Color(0xFF212121),
+      fontFamily: 'Rubik',
     ),
     headlineMedium: TextStyle(
       fontSize: 34,
       fontWeight: FontWeight.w400,
       color: Color(0xFF212121),
+      fontFamily: 'Rubik',
     ),
     headlineSmall: TextStyle(
       fontSize: 24,
       fontWeight: FontWeight.w400,
       color: Color(0xFF212121),
+      fontFamily: 'Rubik',
     ),
     titleLarge: TextStyle(
       fontSize: 20,
       fontWeight: FontWeight.w500,
       color: Color(0xFF212121),
+      fontFamily: 'Rubik',
     ),
     bodyLarge: TextStyle(
       fontSize: 16,
       fontWeight: FontWeight.w400,
       color: Color(0xFF212121),
+      fontFamily: 'Rubik',
     ),
     bodyMedium: TextStyle(
       fontSize: 14,
       fontWeight: FontWeight.w400,
       color: Color(0xFF212121),
+      fontFamily: 'Rubik',
     ),
     bodySmall: TextStyle(
       fontSize: 12,
       fontWeight: FontWeight.w400,
       color: Color(0xFF757575),
+      fontFamily: 'Rubik',
     ),
     labelLarge: TextStyle(
       fontSize: 14,
       fontWeight: FontWeight.w500,
       color: Color(0xFF212121),
+      fontFamily: 'Rubik',
     ),
   );
   
@@ -86,6 +96,7 @@ class AppThemes {
   // Light theme
   static final ThemeData lightTheme = ThemeData(
     useMaterial3: true,
+    fontFamily: 'Rubik',
     colorScheme: const ColorScheme.light(
       primary: _primaryColorLight,
       secondary: _secondaryColorLight,
@@ -167,6 +178,7 @@ class AppThemes {
 
   // Dark theme
   static final ThemeData darkTheme = ThemeData(
+    fontFamily: 'Rubik',
     useMaterial3: true,
     colorScheme: const ColorScheme.dark(
       primary: _primaryColorDark,