[Parveen-collab]

• Install and configure Tailwind CSS, PostCSS, and Autoprefixer with dark mode support.
• Install @mui/material, @emotion/react, @emotion/styled, and @mui/icons-material.
• Create src/theme.js to configure dynamic MUI light/dark theme matching brand teal/cyan design system.
• Wrap application root with ThemeProvider and CssBaseline in src/App.jsx.
• Replace custom modals, spinners, alerts, and tooltips with MUI Dialog, CircularProgress, Alert, Tooltip, and Chip across
  App.jsx,
  AuthScreen.jsx,
  ConnectDockerModal.jsx,
  PasswordToggleButton.jsx.