feat: Initialize dashboard app with core structure and routing

This commit sets up the foundation for the new dashboard application by
implementing the main component structure, routing, and a basic UI shell with
KendoReact components.

- Set up the main application shell
- Implement a routing system with React Router
- Build a new App Bar component
- Create page placeholders for all routes
- Corrected various import and export errors

src/components/AppBar.jsx

@@ -0,0 +1,27 @@
+import React from 'react';
+import { AppBar, AppBarSection, AppBarSpacer } from '@progress/kendo-react-layout';
+import { Button } from '@progress/kendo-react-buttons';
+import { Link } from 'react-router-dom';
+
+const CampfireAppBar = () => {
+    return (
+        <AppBar position="sticky">
+            <AppBarSection>
+                <Link to="/dashboard">
+                    <Button look="flat">Dashboard</Button>
+                </Link>
+                <Link to="/editor">
+                    <Button look="flat">New Post</Button>
+                </Link>
+            </AppBarSection>
+
+            <AppBarSpacer style={{width: 32 }} />
+
+            <AppBarSection>
+                <Button look="flat">Logout</Button>
+            </AppBarSection>
+        </AppBar>
+    );
+};
+
+export default CampfireAppBar;