The web/PWA Amber path set compressionType=none; the native intents set neither
compressionType nor returnType, and the JS gzip decoder was never called. NIP-55
lets Amber gzip a large result (Signer1... base64), so a long nip44_decrypt (a
long DM) could arrive compressed and be parsed as garbage. Native intents now
send compressionType=none; the JS signer also gunzips any Signer1 result. Timeout
message no longer wrongly says Amber may not be installed.
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