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/diff-sequences/build/index.d.ts

@@ -0,0 +1,38 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+export declare type Callbacks = {
+  foundSubsequence: FoundSubsequence;
+  isCommon: IsCommon;
+};
+
+declare function diffSequence(
+  aLength: number,
+  bLength: number,
+  isCommon: IsCommon,
+  foundSubsequence: FoundSubsequence,
+): void;
+export default diffSequence;
+
+declare type FoundSubsequence = (
+  nCommon: number, // caller can assume: 0 < nCommon
+  aCommon: number, // caller can assume: 0 <= aCommon && aCommon < aLength
+  bCommon: number,
+) => void;
+
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ */
+declare type IsCommon = (
+  aIndex: number, // caller can assume: 0 <= aIndex && aIndex < aLength
+  bIndex: number,
+) => boolean;
+
+export {};