Refactor crash error component, header component, and main page component

- Refactored crash error component to update the background color of the reset button.
- Removed commented code in the header component.
- Imported BUTTON_DIV_STYLE constant in the main page component.

src/frontend/src/components/CrashErrorComponent/index.tsx

@@ -14,7 +14,7 @@ export default function CrashErrorComponent({ error, resetErrorBoundary }) {
         <div className="flex justify-center">
           <button
             onClick={resetErrorBoundary}
-            className="bg-almost-dark-blue hover:bg-ring text-background font-bold py-2 px-4 rounded mr-4"
+            className="bg-primary hover:bg-ring text-background font-bold py-2 px-4 rounded mr-4"
           >
             Reset Application
           </button>

src/frontend/src/components/headerComponent/index.tsx

@@ -99,7 +99,8 @@ export default function Header() {
           >
             <FaDiscord className="h-5 w-5" />
           </a>
-          {/* <Separator orientation="vertical" />
+
+          <Separator orientation="vertical" />
           <button
             className="text-gray-600 hover:text-gray-500 dark:text-gray-300 dark:hover:text-gray-200"
             onClick={() => {

src/frontend/src/pages/MainPage/index.tsx

@@ -5,6 +5,7 @@ import { Button } from "../../components/ui/button";
 import { Link, useNavigate } from "react-router-dom";
 import { CardComponent } from "../../components/cardComponent";
 import { USER_PROJECTS_HEADER } from "../../constants";
+import { BUTTON_DIV_STYLE } from "../../constants";
 export default function HomePage() {
   const { flows, setTabId, downloadFlows, uploadFlows, addFlow, removeFlow } =
     useContext(TabsContext);