Bitsy v4.6 — Verification hardening and UI polish

Bitcoin ownership verification now passes the full BIP-322 specification, with cross-checked signature verification across all supported chains and a round of interface refinements.

Bitcoin ownership verification now passes the full BIP-322 specification test vectors, including modern SegWit (bc1q) and Taproot (bc1p) signatures.

Cross-checked Ethereum, Solana, and Bitcoin signature verification against real signatures, with anti-malleability protections confirmed.

Frosted-glass surfaces render consistently across Safari and iOS.

Even spacing and alignment fixes across panels, the navigation bar, and form controls.