refactor(gallery): extract the shared engine into widgets.jsHEADmain

First componentization batch per the component-generation spec: widgets.js is a classic script exposing the GW namespace (svgEl, polar, drag helpers, seg7, buildBars, VU law, SCREEN_FAMS) plus a css-injection scaffold that grows as builders move in. The gallery loads it via a relative script src and destructures the helpers, so file:// keeps working. Probes green.

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