Mandacaru v0.13.2

• Add x86_64 ABI support — the app now runs on x86_64 Android emulators, not just ARM64 devices.
• Adopt synced FFI bindings (UniFFI 0.31 + bitcoinkernel).
• Bump the built-in Utreexo accumulator snapshot.
• Fix getpeerinfo error-log spam from the native library.
• Migrate coroutine error handling to runSuspendCatching to preserve structured-concurrency cancellation.