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/postcss/lib/parse.js

@@ -0,0 +1,42 @@
+'use strict'
+
+let Container = require('./container')
+let Input = require('./input')
+let Parser = require('./parser')
+
+function parse(css, opts) {
+  let input = new Input(css, opts)
+  let parser = new Parser(input)
+  try {
+    parser.parse()
+  } catch (e) {
+    if (process.env.NODE_ENV !== 'production') {
+      if (e.name === 'CssSyntaxError' && opts && opts.from) {
+        if (/\.scss$/i.test(opts.from)) {
+          e.message +=
+            '\nYou tried to parse SCSS with ' +
+            'the standard CSS parser; ' +
+            'try again with the postcss-scss parser'
+        } else if (/\.sass/i.test(opts.from)) {
+          e.message +=
+            '\nYou tried to parse Sass with ' +
+            'the standard CSS parser; ' +
+            'try again with the postcss-sass parser'
+        } else if (/\.less$/i.test(opts.from)) {
+          e.message +=
+            '\nYou tried to parse Less with ' +
+            'the standard CSS parser; ' +
+            'try again with the postcss-less parser'
+        }
+      }
+    }
+    throw e
+  }
+
+  return parser.root
+}
+
+module.exports = parse
+parse.default = parse
+
+Container.registerParse(parse)