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Embeddable viewer: extract monolithic viewer.html into modular ES module
New features
Embeddable ThreeJSViewer class — ES module in viewer/viewer.js that mounts into any container div with new ThreeJSViewer(container, options). Supports wsUrl, wsPort, htmlTemplate, and cubemapData options.
destroy() method — full cleanup of WebSocket, RAF, ResizeObserver, and event listeners
Scoped events — keyboard shortcuts scoped to container (tabindex), resize via ResizeObserver instead of window
Build pipeline — viewer/build.py regenerates the self-contained viewer.html from source files; CI verifies freshness
Source file separation — CSS, HTML template, and cubemap images extracted into viewer/ subfolder
Bug fixes
Multi-material meshes now correctly apply color changes (previously crashed on array materials)
destroy() prevents reconnect attempts after teardown
