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/css-tree/cjs/syntax/node/Value.cjs

@@ -0,0 +1,26 @@
+'use strict';
+
+const name = 'Value';
+const structure = {
+    children: [[]]
+};
+
+function parse() {
+    const start = this.tokenStart;
+    const children = this.readSequence(this.scope.Value);
+
+    return {
+        type: 'Value',
+        loc: this.getLocation(start, this.tokenStart),
+        children
+    };
+}
+
+function generate(node) {
+    this.children(node);
+}
+
+exports.generate = generate;
+exports.name = name;
+exports.parse = parse;
+exports.structure = structure;