Migrate Tailwind to v4 and Ensure Consistent UI

Description:

Upgrade dFlow’s UI framework from Tailwind CSS v3 to v4, and audit the application to ensure consistent design across all components after migration. This will allow us to take advantage of Tailwind’s latest features, improved performance, and future compatibility.

Acceptance Criteria:

• Upgrade Tailwind from v3 to v4 in the codebase.

• Update config files and remove deprecated options.

• Refactor existing components to ensure compatibility with v4 syntax and changes.

• Audit all pages and components for consistent spacing, typography, and color usage.

• Ensure dark mode and responsive breakpoints remain functional.

• Update documentation to reflect any class name or config changes.

Benefits:

• Access to new Tailwind features and performance improvements.

• Improved long-term maintainability.

• Consistent and polished UI throughout dFlow.