wasm: one demo page with the whole pipeline (#157) #541

Job	Run time
msrv (1.85 core · 1.88 workspace)	40s
check (directml, windows-latest)	1m 38s
wasm32 (declarative converters)	1m 2s
check (coreml, macos-latest)	41s
check (cuda, ubuntu-latest)	42s
test (stable)	2m 22s
check (cuda,tensorrt, ubuntu-latest)	39s
fmt · clippy (pinned)	32s
release & publish	-1s
	8m 15s

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