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/dom-helpers/cjs/animate.d.ts

@@ -0,0 +1,19 @@
+import { EventHandler } from './addEventListener';
+import { TransformValue } from './isTransform';
+import { Property } from './types';
+declare type AnimateProperties = Record<Property | TransformValue, string>;
+interface Options {
+    node: HTMLElement;
+    properties: AnimateProperties;
+    duration?: number;
+    easing?: string;
+    callback?: EventHandler<'transitionend'>;
+}
+interface Cancel {
+    cancel(): void;
+}
+declare function animate(options: Options): Cancel;
+declare function animate(node: HTMLElement, properties: AnimateProperties, duration: number): Cancel;
+declare function animate(node: HTMLElement, properties: AnimateProperties, duration: number, callback: EventHandler<'transitionend'>): Cancel;
+declare function animate(node: HTMLElement, properties: AnimateProperties, duration: number, easing: string, callback: EventHandler<'transitionend'>): Cancel;
+export default animate;