Refactor to use global Card component and remove deprecated elements

[rafaelhgcarlos]

This pull request refactors the dashboard statistics system by introducing a reusable global Card component and removing the deprecated StatsCard and StatsGrid. The goal is to simplify the dashboard structure and centralize card UI logic in the shared layer.

Key changes:

Reusable Card Component

• Introduces a global Card component with configurable variant, size, and background. (src/shared/components/Card/Card.tsx)
• Adds style and configuration layers for card layout and states. (src/shared/components/Card/Card.styles.ts)
• Defines strong typing for the component props. (src/shared/components/Card/Card.types.ts)
• Exports the component through a central index file. (src/shared/components/Card/index.ts)

Dashboard Refactor

• Replaces StatsCard usage with the new shared Card component. (src/modules/dashboard/pages/DashboardPage.tsx)
• Moves the grid layout directly into the dashboard page for simpler structure.

Removed Components

• Removes deprecated StatsCard. (src/modules/dashboard/components/StatsCard.tsx)
• Removes deprecated StatsGrid. (src/modules/dashboard/components/StatsGrid.tsx)

Result

• Reduces component duplication.
• Improves UI consistency through a shared component.
• Simplifies the dashboard layout and maintenance.