fix(deps): resolve frontend advisories

Upgrade React Router to the patched v7 line and refresh transitive js-yaml and nanoid packages. Adapt RouterProvider flags and the Jest jsdom environment without changing application routes.

job-tracker-ui/src/App.tsx

@@ -437,7 +437,7 @@ export default function App() {
           <JobTrackerThemeProvider preference={themeMode} systemPrefersDark={systemPrefersDark}>
             <I18nProvider>
               <ThemeControlsContext.Provider value={themeControls}>
-                <RouterProvider router={router} future={{ v7_startTransition: true }} />
+                <RouterProvider router={router} />
               </ThemeControlsContext.Provider>
             </I18nProvider>
           </JobTrackerThemeProvider>

job-tracker-ui/src/cv-builder-deep-link.test.tsx

@@ -44,7 +44,7 @@ function renderAt(id: number) {
   return render(
     <I18nProvider>
       <ToastProvider>
-        <RouterProvider router={router} future={{ v7_startTransition: true }} />
+        <RouterProvider router={router} />
       </ToastProvider>
     </I18nProvider>,
   );

job-tracker-ui/src/setupTests.ts

@@ -1,6 +1,9 @@
 import React from 'react';
+import { TextDecoder, TextEncoder } from 'util';
 import { configure } from '@testing-library/react';
 
+Object.assign(globalThis, { TextDecoder, TextEncoder });
+
 // Heavy MUI views (job table, workspace dialog, profile page) can exceed the
 // 1s default async query timeout on slower machines; findBy*/waitFor assertions
 // still resolve as soon as the element appears.