Add an interactive refrigerant Mollier diagram

[iguchi-lab]

What changed

• add a new p-h Mollier-diagram tool for R32, R410A, R134a, R1234yf, and R290
• expose evaporating/condensing temperature, superheat, subcooling, and pressure-range controls
• render saturation curves, isotherms, isentropes, and the four-state ideal vapor-compression cycle as responsive SVG
• show a calculated state table and SVG download
• add the tool to the calculator home page
• vendor the official CoolProp 8.0.0 JavaScript/WASM build and MIT license
• add only wasm-unsafe-eval to the existing self-hosted script CSP
• add real CoolProp/WASM regression tests for R32 and cycle invariants

Why

iguchi-lab/mollier-diagram is a Python/Matplotlib tool. Running the official CoolProp WebAssembly build in the browser preserves interactive refrigerant calculations without adding another Lambda function or API request.

User impact

The first load downloads approximately 9.2 MB of WebAssembly. Subsequent loads can use the CloudFront browser cache.

Validation

GitHub Actions runs the existing calculator suites plus actual CoolProp/WASM property and refrigeration-cycle tests.