Enhance color theme and update board screen UI

- Added new color definitions for secondary and orange shades in AppColors.
- Updated TaskItem model to remove title and improve description handling.
- Refactored BoardScreen to utilize new color definitions and improve task display.
- Enhanced task status messaging and UI consistency across task cards.

lib/core/theme/colors.dart

@@ -95,6 +95,14 @@ class AppColors {
   static Color get iconColor =>
       _isDarkMode ? const Color(0xFF999999) : const Color(0xFF888888);
 
+  static Color get secondary70 =>
+      _isDarkMode ? const Color(0xFF80C491) : const Color(0xFF1A5E66);
+
+  static Color get secondary20 =>
+      _isDarkMode
+          ? const Color.fromRGBO(80, 89, 78, 0.9)
+          : const Color(0xFFC2EAEF);
+
   static Color get primary10 =>
       _isDarkMode
           ? const Color.fromRGBO(104, 151, 151, 0.2)
@@ -160,6 +168,14 @@ class AppColors {
   static Color get orange20 =>
       _isDarkMode ? const Color(0xFF6B5E4B) : const Color(0xFFF6D7AB);
 
+  static Color get orange =>
+      _isDarkMode ? const Color(0xFFE5821E) : const Color(0xFFC07A25);
+
+  static Color get secondary10 =>
+      _isDarkMode
+          ? const Color.fromRGBO(46, 49, 45, 0.75)
+          : const Color(0xFFC2EAEF);
+
   static Color get red0 =>
       _isDarkMode
           ? const Color(0xFF312F2F)
@@ -174,7 +190,6 @@ class AppColors {
   // static const Color red0 = Color(0xFF312F2F);
   // static const Color red10 = Color(0xFF524545);
   static const Color red = Color(0xFFFF3B30);
-  static const Color orange = Color(0xFFE5821E);
 
   // Other colors
   static const Color lightBlue = Color(0xFFe8ecfc);