feat(trezor): add hidden-wallet passphrase selection and on-chain watcher

[coreyphillips]

Description

Adds Trezor hidden-wallet passphrase selection and an on-chain event watcher, built on bitkit-core 0.1.66 (bumped from 0.1.64), which provides the WalletSelection / PassphraseResponse types and the on-chain watcher FFI.

Hidden-wallet / passphrase rework

• Replaces the old blocking passphrase prompt with a proactive wallet-mode model that mirrors bitkit-android.
• The user picks Standard, passphrase on phone, or passphrase on device up front via a selector + confirmation dialog.
• The selection is bound to the THP session at connect time (currentSelection()); legacy (non-THP) devices that re-request the passphrase mid-operation are answered from the same stored value, keeping both paths in lockstep.
• Switching modes resets the device session (disconnect → reconnect), since the Trezor caches the passphrase for the lifetime of a session.
• Removes the now-dead needsPassphrasePublisher / submitPassphrase / acknowledgeOnDevicePassphrase plumbing.

On-chain event watcher

• New "Event Watcher" section subscribes an xpub to live Electrum updates with no device connected. Shows balance, block height, account type, transaction count, recent transactions, and a rolling event log.
• TrezorEventListener bridges the Rust background callback onto @MainActor.
• The watcher is torn down on disconnect and on network switch; events from stale watchers are filtered out.

Fixes

• PIN pad now supports up to 50 digits (the real Trezor limit), with dots that wrap across rows instead of overflowing a single line.

Notes

• New files are picked up via the project's synchronized file groups (no project.pbxproj wiring needed).
• No changelog fragment: Trezor is a dev/WIP feature, not part of the production app.

Dependencies

• bitkit-core 0.1.66 (Package.resolved + project.pbxproj updated).

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