Refactor useAuth hook, settings components, and docs for formatting and readability improvements

- Consolidated multi-line arguments into single lines where appropriate in `useAuth`.
- Improved spacing and readability in data processing across components (`ProfileSettingsForm`, `PasswordChangeForm`, `SessionCard`).
- Applied consistent table and markdown formatting in design system docs (e.g., `README.md`, `08-ai-guidelines.md`, `00-quick-start.md`).
- Updated code snippets to ensure adherence to Prettier rules and streamlined JSX structures.

frontend/tests/app/admin/layout.test.tsx

@@ -50,9 +50,7 @@ describe('AdminLayout', () => {
   });
 
   const wrapper = ({ children }: { children: React.ReactNode }) => (
-    <QueryClientProvider client={queryClient}>
-      {children}
-    </QueryClientProvider>
+    <QueryClientProvider client={queryClient}>{children}</QueryClientProvider>
   );
 
   it('renders layout with all components for superuser', () => {