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/cssstyle/lib/utils/camelize.js

@@ -0,0 +1,37 @@
+"use strict";
+
+const { asciiLowercase } = require("./strings");
+
+// Utility to translate from `border-width` to `borderWidth`.
+// NOTE: For values prefixed with webkit, e.g. `-webkit-foo`, we need to provide
+// both `webkitFoo` and `WebkitFoo`. Here we only return `webkitFoo`.
+exports.dashedToCamelCase = function (dashed) {
+  if (dashed.startsWith("--")) {
+    return dashed;
+  }
+  let camel = "";
+  let nextCap = false;
+  // skip leading hyphen in vendor prefixed value, e.g. -webkit-foo
+  let i = /^-webkit-/.test(dashed) ? 1 : 0;
+  for (; i < dashed.length; i++) {
+    if (dashed[i] !== "-") {
+      camel += nextCap ? dashed[i].toUpperCase() : dashed[i];
+      nextCap = false;
+    } else {
+      nextCap = true;
+    }
+  }
+  return camel;
+};
+
+// Utility to translate from `borderWidth` to `border-width`.
+exports.camelCaseToDashed = function (camelCase) {
+  if (camelCase.startsWith("--")) {
+    return camelCase;
+  }
+  const dashed = asciiLowercase(camelCase.replace(/(?<=[a-z])[A-Z]/g, "-$&"));
+  if (/^webkit-/.test(dashed)) {
+    return `-${dashed}`;
+  }
+  return dashed;
+};