- add global () with required media upload field
- register new global in and include it in admin live preview
- replace hardcoded frontend landing content with CMS-driven homepage image
- add typed cached utilities for globals/documents + centralized revalidation helpers
- migrate components to new global utility module and remove deprecated helper
- update revalidation hook to use shared global revalidation
- refine frontend layout/header and simplify legacy homepage CSS
- regenerate for new global/schema changes
