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fix(obj): apps bundling obj for react native or the browser fail to build (#485)

3.4.0 added an optional native sha256 backend that imports node:crypto.
bundlers like metro (react native) and esbuild see that import and fail
the build, even though the native backend is never used on those
platforms.

obj now asks the runtime for node:crypto instead of importing it, so
bundlers no longer see it. where the runtime has it (node, deno, bun),
native sha256 is now the default, as it's much faster; elsewhere
js-sha256 is used as before. setSha256Backend() still forces either.

obj also no longer requires crypto.subtle, which it hadn't used since
it moved to js-sha256 - react native apps no longer need to stub it.

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