Summary of Changes

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This pull request addresses the investigation into adopting Tailwind CSS for the XBuilder frontend. It includes a comprehensive assessment document that evaluates the feasibility and impact of such a migration, ultimately recommending a cautious, incremental hybrid strategy. The changes also lay the groundwork for this strategy by integrating Tailwind CSS into the build system and refactoring a selection of UI components to utilize Tailwind's utility-first approach, thereby providing a practical pilot for future adoption.

Highlights

• Tailwind CSS Migration Assessment: A new document has been added detailing an investigation into migrating XBuilder frontend styling to Tailwind CSS. The assessment concludes that a full migration is not a good near-term tradeoff, recommending an incremental hybrid approach instead.
• Tailwind CSS Integration: Tailwind CSS and its Vite plugin have been added as development dependencies, and the necessary configurations have been applied in vite.config.ts and main.ts to integrate Tailwind into the spx-gui project.
• Component Styling Refactoring: Several Vue components and pages, including CenteredWrapper.vue, CourseSeriesItem.vue, TutorialsBanner.vue, and various sign-in and tutorial pages, have been refactored to replace scoped SCSS with Tailwind utility classes, demonstrating the recommended hybrid approach.
• Custom Tailwind Utilities and Theme Mapping: A new tailwind.css file has been introduced to define custom Tailwind utilities and map existing UI design tokens, ensuring consistency with the project's current styling system.

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