chore: make plus icon color match theme (#2179)

lib/pangea/activity_suggestions/create_chat_card.dart

@@ -43,7 +43,10 @@ class CreateChatCard extends StatelessWidget {
                 child: CustomizedSvg(
                   svgUrl:
                       "${AppConfig.assetsBaseURL}/${ActivitySuggestionsConstants.plusIconPath}",
-                  colorReplacements: const {},
+                  colorReplacements: {
+                    "#CDBEF9":
+                        colorToHex(Theme.of(context).colorScheme.secondary),
+                  },
                   height: 80,
                   width: 80,
                 ),

lib/pangea/common/widgets/customized_svg.dart

@@ -138,3 +138,10 @@ class CustomizedSvg extends StatelessWidget {
     );
   }
 }
+
+String colorToHex(Color color) {
+  return '#'
+      '${(color.r * 255).toInt().toRadixString(16).padLeft(2, '0')}'
+      '${(color.g * 255).toInt().toRadixString(16).padLeft(2, '0')}'
+      '${(color.b * 255).toInt().toRadixString(16).padLeft(2, '0')}';
+}