Fixed color scheme and navigation consistency across all pages

Improve demo user UX: disable save button with friendly messaging

perf(ui): preconnect/prefetch map assets, client-side sort by created_at; annotate Ishita’s today entries; defer heavy map work

fix(ui): include location_name in POST/PUT JSON and display it in Recent Trees

Major refactoring: Modular architecture implementation (v5.0.0)