Build Phantom mobile universal links and expose provider deeplink reference data
Build a Phantom browse universal link that opens a URL inside Phantom's in-app browser (mobile). Per Phantom docs: https://phantom.app/ul/browse/<url-encoded-target>?ref=<url-encoded-ref>. Both URLs must use https.
Return official Phantom deeplink documentation URLs, v1 universal-link base path, common provider method paths (Solana mobile), supported clusters, and implementation notes (encryption, sessions).