* fix: prefer WebHID over WebUSB for Ledger transport to fix Flex/Nano X connectivity
* fix(ui): release Ledger transport with explicit disconnect lifecycle
* fix(ui): align Ledger app mode with reactive settings context
* refactor(ui): keep useLedger render phase pure for init errors
* fix(ui): apply popup-aware routing to Ledger connection links
* fix(ui): harden Ledger signing error handling and mismatch UX
- Remove chain.name being set as specName from merkleizeMetadata payload
- Use reactive SettingsContext ledgerApp instead of settings.get() snapshot
- Guard no-metadata signing path with setIsBusy(false) + early return
- Detect signer mismatch by normalizing addresses and block signing when mismatched
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