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🤖 ## Summary When an iOS push notification comes from someone the app has no cached name for, the notification title showed the first characters of the sender's raw public key — for example `aa4fc866…`. That fragment is unreadable and doesn't match how the same person appears anywhere else in Buzz. This PR changes that title to the compact form of the sender's npub (npub is the human-readable encoding of a Nostr public key): first 8 and last 4 characters — for example `npub14f8…9nsy`, the same identity shape used across the desktop and mobile apps. - Unnamed senders: raw hex fragment → compact npub. - Named senders: unchanged — a sender the app has a display name for still titles the notification with that name. - Unverifiable sender identities (malformed keys, or lookalike strings that are not literal 64-hex-digit keys) now render a neutral "Someone" instead of partial raw key material. - Everything else about the notification is unchanged: body text, subtitle, thread matching and grouping, deep-link navigation, thread identifiers, and the internal hex public key the resolver matches on. The native iOS notification-service package (`BuzzPushKit`) gains a minimal in-house bech32 codec (bech32 is the checksummed string encoding npubs use) — checksum-validated, 32-byte keys only, and no new external dependency. The hex input branch accepts exactly a 64 ASCII hex digit key before any parsing, so strings that merely parse like hex (for example a run of `+a` pairs) cannot become a displayed identity; this is input validation for presentation. Event signature verification is untouched. ### Related issue Fixes: N/A. Searched existing issues/PRs for push-notification npub identity — closest related: none found. ### Testing At head `3e3f2813b8864b76257ccb50dea3a4b31fa4de0d` (base `44316ff72f5f7de014c66b01cbf534298a70c249`; 4 files, +321/−4): - CI `Mobile Swift` lane, at this exact head — all passed: `swift test` (73 tests, 0 failures), the SwiftPM debug and release builds of `mobile/ios/BuzzPushKit`, and the unsigned iOS release build. - Test coverage: npub encoding cross-checked against independent nostr-rs/NIP-19 vectors; rejection of bad checksums, mixed case, wrong lengths, invalid alphabet, padding, and non-32-byte payloads; resolver boundary matrix — hex/npub/invalid sender keys render compact npub or "Someone" while body, subtitle, sender key, and thread identifier pass through; named senders keep cached display names. ### Task provenance Buzz channel: `1f0e4a3d-7e01-4efe-bb16-843b357f85c9` Task: buzz://message?channel=1f0e4a3d-7e01-4efe-bb16-843b357f85c9&id=86b34eb4bd84a1472419e9af22636c011c0fe273e3c196f967d7a36996e149b6 --------- Signed-off-by: Logan Johnson <loganj@squareup.com> Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz>