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/src/components/admin/Breadcrumbs.tsx

@@ -61,10 +61,7 @@ export function Breadcrumbs() {
           return (
             <li key={breadcrumb.href} className="flex items-center">
               {index > 0 && (
-                <ChevronRight
-                  className="mx-2 h-4 w-4 text-muted-foreground"
-                  aria-hidden="true"
-                />
+                <ChevronRight className="mx-2 h-4 w-4 text-muted-foreground" aria-hidden="true" />
               )}
               {isLast ? (
                 <span