feat: migrate Dashboard page from CoreUI to Material UI

[devin-ai-integration]

feat: migrate Dashboard page from CoreUI to Material UI

Summary

This PR demonstrates migrating the Dashboard page from CoreUI/Bootstrap components to Material UI as a sample migration. The changes include:

• Added Material UI dependencies (@mui/material, @mui/icons-material, @emotion/react, @emotion/styled)
• Created new DashboardMUI.js component using MUI equivalents for CoreUI components
• Updated routes.js to load the new MUI-based Dashboard

Component mapping:

• CCard → Card
• CRow/CCol → Grid
• CProgress → LinearProgress
• CTable → Table/TableContainer
• CButton → Button
• CAvatar → Avatar

Review & Testing Checklist for Human

• Chart is a placeholder - The original Dashboard had a working line chart (MainChart). The MUI version shows "Chart Area (Material UI)" placeholder text. Verify this is acceptable for the sample migration scope.
• Visual comparison - Run npm start and compare the MUI Dashboard layout against the original. Some features are simplified (country flags now show text, payment icons now show Chip labels).
• Responsive behavior - Test the Grid layout at different breakpoints (xs, sm, md, lg) to ensure proper responsiveness.
• Theme compatibility - The MUI components use hardcoded colors in colorMap. Verify they work acceptably within the existing CoreUI layout shell (sidebar, header remain CoreUI).
• Bundle size - Both CoreUI and MUI are now included. Consider if this is acceptable for a production build.

Test plan: Run npm start, navigate to the Dashboard, scroll through all sections (stat cards, traffic card, traffic & sales card with table), and verify components render correctly.

Notes

• The original WidgetsDropdown and WidgetsBrand components (which had mini charts) were replaced with simpler StatCard components
• Pre-existing lint errors in Charts.js, MainChart.js, and Widgets.js are unrelated to this PR

Link to Devin run: https://partner-workshops.devinenterprise.com/sessions/b11143e06f2b460795f86ed44f38229a

[devin-ai-integration]

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