Darwin frameworks bundled, wallet-ui types pinned

Shipped the macOS sidecar bundling pass for vanta-desktop. The setup-sidecars.sh script now copies the right Rust frameworks into Frameworks/ so notarization stops failing on missing dylibs. v2 test renames so vanta_v2_*.rs reads consistently with the vanta-node-v2 rust crate name.

The thing nobody tells you about Tauri 2.x sidecars: the binary name in tauri.conf.json must match the target triple-suffixed binary on disk. bitcoind-aarch64-apple-darwin is what the loader looks for; bitcoind alone gets ignored.