feat(frontend): add API client, layout, and routing

- Create Axios-based API client with sources, jobs, and dashboard endpoints
- Add responsive Layout component with navigation sidebar
- Set up React Router with Dashboard, Backups, and Settings routes
- Configure TanStack Query provider with default options
- Use lucide-react for navigation icons

frontend/node_modules/loupe/lib/date.js

@@ -0,0 +1,14 @@
+import { truncate } from './helpers'
+
+export default function inspectDate(dateObject, options) {
+  const stringRepresentation = dateObject.toJSON()
+
+  if (stringRepresentation === null) {
+    return 'Invalid Date'
+  }
+
+  const split = stringRepresentation.split('T')
+  const date = split[0]
+  // If we need to - truncate the time portion, but never the date
+  return options.stylize(`${date}T${truncate(split[1], options.truncate - date.length - 1)}`, 'date')
+}