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/home/DemoCredentialsModal.tsx

@@ -51,7 +51,8 @@ export function DemoCredentialsModal({ open, onClose }: DemoCredentialsModalProp
         <DialogHeader>
           <DialogTitle>Try the Live Demo</DialogTitle>
           <DialogDescription>
-            Use these credentials to explore the template&apos;s features. Both accounts are pre-configured with sample data.
+            Use these credentials to explore the template&apos;s features. Both accounts are
+            pre-configured with sample data.
           </DialogDescription>
         </DialogHeader>