Render ZAP1 attestation memos in transaction details

[Zk-nd3r]

ZAP1 memos in shielded transactions currently display as raw hex. This PR parses them into typed event cards.

What it does:

• Detects ZAP1 prefix (ZAP1: or 0x5a41503109) in memo content
• Parses event type byte into human-readable name (21 types)
• Extracts structured fields (wallet hash, amount, timestamp, serial number)
• Renders as a typed event card instead of hex dump

Files:

• Zap1MemoParser.swift - parser (matches the Kotlin implementation in zodl-android PR #2173)
• Zap1MemoParserTests.swift - XCTest coverage
• 1-line patch to TransactionDetailsStore.swift at line 434

Verify any attestation: frontiercompute.cash/verify.html

Protocol spec: frontiercompute.cash/protocol.html
ZIP 1243: github.com/zcash/zips/pull/1243

[Zk-nd3r]

Cross-platform conformance suite added at github.com/Frontier-Compute/zap1/tree/main/contrib/zodl-conformance. Same 20+ test vectors for both platforms.

Swift parser passes all vectors. Matches the Kotlin implementation in zodl-android #2173 exactly. Handles null-byte padded memos (real Zcash 512-byte format).