feat: migrate from CoreUI to Material UI (MUI)

[devin-ai-integration]

feat: migrate from CoreUI to Material UI (MUI)

Summary

This PR completely migrates the React admin template from CoreUI to Material UI (MUI). The migration includes:

• Dependencies: Replaced CoreUI packages (@coreui/react, @coreui/icons, @coreui/chartjs, etc.) with MUI packages (@mui/material, @mui/icons-material, @emotion/react, @emotion/styled)
• Charts: Replaced Chart.js with Recharts for data visualization
• Styling: Removed SCSS files and replaced with MUI's sx prop and ThemeProvider
• Layout: Converted sidebar to MUI Drawer, header to AppBar/Toolbar
• Components: All 40+ view components rewritten using MUI equivalents
• Theme: Created new theme.js with light/dark mode support using MUI's theming system
• Icons: Replaced CoreUI icons with Material Icons

The Redux state management for sidebar visibility and theme selection has been preserved.

Review & Testing Checklist for Human

This is a high-risk PR due to the complete UI framework replacement. Please verify:

• Run the app locally (npm start) and visually inspect all pages - build passing does not guarantee visual correctness
• Test theme switching - verify light/dark/auto modes work correctly via the header dropdown
• Test sidebar navigation - verify expand/collapse, nested menu groups, and mobile responsive behavior (temporary drawer on mobile)
• Test all form components - checkboxes, radios, selects, text fields, sliders, validation states
• Verify charts render correctly - Dashboard charts, Charts page, and widget charts use Recharts now instead of Chart.js
• Test authentication pages - Login, Register, 404, 500 pages render correctly outside the main layout

Recommended test plan:

1. Run npm start and navigate through every page in the sidebar
2. Toggle theme between light/dark/auto
3. Resize browser to test responsive behavior
4. Test sidebar collapse/expand on desktop and mobile viewports

Notes

• Some CoreUI PRO feature links were removed from navigation (they were external links to CoreUI docs)
• MainChart now uses static data instead of random generation to satisfy React purity lint rules
• The build shows a warning about chunk sizes (>500KB) which existed before and is not introduced by this PR

Link to Devin run: https://partner-workshops.devinenterprise.com/sessions/59114de117d34ee6a6eaf27cbf5e6b71
Requested by: arjun.b2@cognizant.com

[devin-ai-integration]

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