Dion Moult e55a360aa2 web: scaffold IfcViewerWeb (Emscripten clear-color renderer) ...

First Emscripten target. main_web.cpp brings up a wgpu instance against
a <canvas id="viewer-canvas">, requests adapter+device asynchronously
via the standard webgpu.h callback chain, configures the surface, and
clears to the BonsaiViewer slate background on each RAF tick. No
sidecar load, no pipelines, no scene state yet — the goal is to end-
to-end verify the build + canvas + wgpu plumbing.

src/ifcviewer-web/ is a separate CMake root (not a subdir under the
desktop cmake/CMakeLists.txt) so the web build doesn't have to opt out
of Qt / OpenCASCADE / IfcGeom find_packages it can't satisfy. It adds
src/ifcviewer EXCLUDE_FROM_ALL and consumes only IfcViewerCore.

src/ifcviewer/CMakeLists.txt now gates the wgpu-native fetch + the
Qt-using IfcViewer target + install commands behind NOT EMSCRIPTEN.
The wgpu_native link target still resolves under Emscripten as an
INTERFACE library that activates --use-port=emdawnwebgpu (Dawn's
webgpu.h, replaces the legacy -sUSE_WEBGPU=1).

Build:
    source path/to/emsdk_env.sh
    emcmake cmake -S src/ifcviewer-web -B build-web -G Ninja
    ninja -C build-web
    python3 -m http.server --directory build-web 8080
    # open http://localhost:8080/IfcViewerWeb.html in a WebGPU-capable
    # browser (Chrome 113+, Edge 113+).

Phase B step 3 of #45.

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..

CMakeLists.txt

web: scaffold IfcViewerWeb (Emscripten clear-color renderer)

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main_web.cpp

web: scaffold IfcViewerWeb (Emscripten clear-color renderer)

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shell.html

web: scaffold IfcViewerWeb (Emscripten clear-color renderer)

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