Improve UI Responsiveness on Data-Heavy Pages with React 19 Streaming

[BoraIneviNMI]

Improvements

• In pages that work with the NMI API or other slow APIs, return a promise from the loader so that the next page loads quickly and React can show the suspense fallback.

Closes #232

Summary by CodeRabbit

• New Features

  • Redesigned nutrient advice page with KPI and nutrient sections, plus skeleton loaders for a smoother experience.
  • Revamped atlas field details into a unified layout with responsive design and dedicated loading skeletons.
  • Added per-field navigation and overview on nitrogen balance pages.

• Refactor

  • Converted nutrient balance, norms, nutrient advice, and atlas field views to progressive loading for faster initial display and consistent spinners/skeletons.
  • Enhanced error handling with clearer, user-friendly messages.

• Chores

  • Bumped app version (minor).