chore: auto-fix Biome formatting and configure lint rules

Run biome check --write --unsafe to fix tabs, import ordering, and
non-null assertions across entire codebase. Disable a11y rules not
applicable to this single-user app. Exclude auto-generated routeTree.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/client/main.tsx

@@ -1,29 +1,29 @@
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { createRouter, RouterProvider } from "@tanstack/react-router";
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
-import { RouterProvider, createRouter } from "@tanstack/react-router";
-import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { routeTree } from "./routeTree.gen";
 
 const queryClient = new QueryClient();
 
 const router = createRouter({
-  routeTree,
-  context: {},
+	routeTree,
+	context: {},
 });
 
 declare module "@tanstack/react-router" {
-  interface Register {
-    router: typeof router;
-  }
+	interface Register {
+		router: typeof router;
+	}
 }
 
 const rootElement = document.getElementById("root");
 if (!rootElement) throw new Error("Root element not found");
 
 createRoot(rootElement).render(
-  <StrictMode>
-    <QueryClientProvider client={queryClient}>
-      <RouterProvider router={router} />
-    </QueryClientProvider>
-  </StrictMode>,
+	<StrictMode>
+		<QueryClientProvider client={queryClient}>
+			<RouterProvider router={router} />
+		</QueryClientProvider>
+	</StrictMode>,
 );