♻️ refactor(web): migrate React modules from .js to .jsx and align entrypoint

- Rename React components/pages/utilities that contain JSX to `.jsx` across `web/src`
- Update import paths and re-exports to match new `.jsx` extensions
- Fix Vite entry by switching `web/index.html` from `/src/index.js` to `/src/index.jsx`
- Verified remaining `.js` files are plain JS (hooks/helpers/constants) and do not require JSX
- No runtime behavior changes; extension and reference alignment only

Context: Resolves the Vite pre-transform error caused by the stale `/src/index.js` entry after migrating to `.jsx`.

web/src/components/layout/HeaderBar/Navigation.jsx

@@ -0,0 +1,88 @@
+/*
+Copyright (C) 2025 QuantumNous
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+For commercial licensing, please contact support@quantumnous.com
+*/
+
+import React from 'react';
+import { Link } from 'react-router-dom';
+import SkeletonWrapper from './SkeletonWrapper';
+
+const Navigation = ({
+  mainNavLinks,
+  isMobile,
+  isLoading,
+  userState
+}) => {
+  const renderNavLinks = () => {
+    const baseClasses = 'flex-shrink-0 flex items-center gap-1 font-semibold rounded-md transition-all duration-200 ease-in-out';
+    const hoverClasses = 'hover:text-semi-color-primary';
+    const spacingClasses = isMobile ? 'p-1' : 'p-2';
+
+    const commonLinkClasses = `${baseClasses} ${spacingClasses} ${hoverClasses}`;
+
+    return mainNavLinks.map((link) => {
+
+      const linkContent = <span>{link.text}</span>;
+
+      if (link.isExternal) {
+        return (
+          <a
+            key={link.itemKey}
+            href={link.externalLink}
+            target='_blank'
+            rel='noopener noreferrer'
+            className={commonLinkClasses}
+          >
+            {linkContent}
+          </a>
+        );
+      }
+
+      let targetPath = link.to;
+      if (link.itemKey === 'console' && !userState.user) {
+        targetPath = '/login';
+      }
+
+      return (
+        <Link
+          key={link.itemKey}
+          to={targetPath}
+          className={commonLinkClasses}
+        >
+          {linkContent}
+        </Link>
+      );
+    });
+  };
+
+  return (
+    <nav className="flex flex-1 items-center gap-1 lg:gap-2 mx-2 md:mx-4 overflow-x-auto whitespace-nowrap scrollbar-hide">
+      <SkeletonWrapper
+        loading={isLoading}
+        type="navigation"
+        count={4}
+        width={60}
+        height={16}
+        isMobile={isMobile}
+      >
+        {renderNavLinks()}
+      </SkeletonWrapper>
+    </nav>
+  );
+};
+
+export default Navigation;