v2.0.0 - 10 features + premium theme overhaul

Live demo: https://flynntaggart26.github.io/Climate-energy/

Highlights

• 10 new features: KPI dashboard, Top-10 ranking, temperature-anomaly overlay, timeline animation, sortable data table, 2030 OLS forecast, region filters, JSON/embed exports, shortcuts + guided tour, ?selftest=1 in-browser harness
• 6 premium themes (Dark, Light, Ocean, Forest, Sunset, Auto) with theme-aware Chart.js colors
• Glassmorphism header/controls, custom sliders, gradient components, ambient backgrounds
• Critical fix: missing brace in updateURL() crashed all views (stuck on "Loading data")
• CI workflow: data validation, JS syntax, feature markers, HTTP smoke test on every push
• README rewrite with badges, deep links, methodology, and roadmap