Changed

• Dashboard topbar cleanup. Removed the Menu, Theme, Export JSON, Export CSV, and ? buttons from the top-right of the web dashboard. The same actions remain available via keyboard shortcuts and the command palette.
• Futuristic dark UI refresh. New deep space purple/cyan palette with neon glows on buttons, cards, nav items, status dots, and stat values; gradient primary buttons and a subtle gradient on the topbar.
• Default to dark mode. The dashboard now defaults to dark mode on first visit.