[Docs] Core.Webgl viewer.load() does not build geometry — clarify the two-step flow

[SamuelAB-VIM]

Environment

• vim-web 1.0.0-alpha.0, IIFE build (dist/vim-web.iife.js) loaded via <script>
• API: VIM.Core.Webgl.createViewer() (headless, custom UI)
• Chromium / desktop, devicePixelRatio 1.75
• Model: 2,547 elements (2,264 with geometry), 12 Revit categories, structural

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Summary. Docs describe load() as “parses the VIM file, builds 3D geometry, and renders
the scene.” For the headless Core.Webgl viewer, viewer.load(...).getVim() resolves with an
empty canvas — geometry only appears after a separate await vim.load().

Repro.

const vim = await viewer.load({ url: 'model.vim' }).getVim(); // canvas stays blank
await vim.load();                                              // now geometry renders
await viewer.camera.snap().frame('all');                       // frame() lives on snap()/lerp()

Asks.

• Document the parse-vs-build split for Core.Webgl (and whether React.Webgl differs).
• Note that camera framing is viewer.camera.snap().frame('all') / lerp(d).frame(target),
  not viewer.camera.frame(...) — the latter throws frame is not a function.