Refactor tests, documentation, and component code for consistent formatting and improved readability

- Reformatted test files (`RegistrationActivityChart.test.tsx`, `DemoCredentialsModal.test.tsx`) for indentation consistency.
- Reduced inline style verbosity across components and docs (`DemoModeBanner`, `CodeBlock`, `MarkdownContent`).
- Enhanced Markdown documentation (`sync-msw-with-openapi.md`, `MSW_AUTO_GENERATION.md`) with spacing updates for improved clarity.
- Updated MSW configuration to simplify locale route handling in `browser.ts`.

frontend/tests/components/home/DemoCredentialsModal.test.tsx

@@ -86,7 +86,9 @@ describe('DemoCredentialsModal', () => {
     fireEvent.click(adminCopyButton!);
 
     await waitFor(() => {
-      expect(navigator.clipboard.writeText).toHaveBeenCalledWith('admin@example.com\nAdminPass1234!');
+      expect(navigator.clipboard.writeText).toHaveBeenCalledWith(
+        'admin@example.com\nAdminPass1234!'
+      );
       const copiedButtons = screen.getAllByRole('button');
       const copiedButton = copiedButtons.find((btn) => btn.textContent?.includes('Copied!'));
       expect(copiedButton).toBeInTheDocument();