fix: point file manager empty-state link to the files page route (#13450)

The "My Files" shortcut in the file manager empty state linked to a
top-level "/files" route that does not exist. The files page is nested
under "assets" (routes.tsx: assets -> files), so clicking the link
dead-ended instead of opening My Files.

Point the link at "/assets/files", matching the sidebar navigation in
sideBarFolderButtons (_navigate("/assets/files")). Add a regression test
asserting the empty-state link's href.

src/frontend/src/modals/fileManagerModal/components/recentFilesComponent/__tests__/recent-files-component.test.tsx

@@ -1,5 +1,6 @@
 import { fireEvent, render, screen } from "@testing-library/react";
 import type { ComponentPropsWithoutRef, ReactNode } from "react";
+import { MemoryRouter } from "react-router-dom";
 import type { FileType } from "@/types/file_management";
 import { setRelativePathForServerPath } from "@/utils/file-relative-path-map";
 import RecentFilesComponent from "../index";
@@ -166,4 +167,24 @@ describe("RecentFilesComponent", () => {
 
     expect(screen.getByTestId("files-renderer")).toBeInTheDocument();
   });
+
+  it("links the empty-state 'My Files' shortcut to the /assets/files route", () => {
+    // Regression: the empty-state link pointed at the non-existent top-level
+    // "/files" route (a dead end). The files page is nested under "assets",
+    // so the link must target "/assets/files" — matching the sidebar's
+    // navigation in sideBarFolderButtons.
+    render(
+      <MemoryRouter>
+        <RecentFilesComponent
+          files={[]}
+          selectedFiles={[]}
+          setSelectedFiles={jest.fn()}
+          types={["txt"]}
+          isList={true}
+        />
+      </MemoryRouter>,
+    );
+
+    expect(screen.getByRole("link")).toHaveAttribute("href", "/assets/files");
+  });
 });

src/frontend/src/modals/fileManagerModal/components/recentFilesComponent/index.tsx

@@ -427,7 +427,7 @@ export default function RecentFilesComponent({
               {t("fileManager.orVisit")}{" "}
               <CustomLink
                 className="text-accent-pink-foreground underline"
-                to="/files"
+                to="/assets/files"
               >
                 {t("files.myFiles")}.
               </CustomLink>