The signing popup decided whether to show the message view or the
transaction view by inspecting fields on the payload (`data`,
`blockNumber`), while the background picks the signing behaviour from the
message channel the request arrived on. Those two are independent and the
payload comes from the dapp, so they can disagree.
`RequestSign` becomes a discriminated union on `channel`, set by the
background from the message type. Correlating the discriminant with the
payload type means consumers narrow through `isExtrinsicRequest` rather
than casting, so the display and the signing path can no longer drift
apart. `Tabs.extrinsicSign` also rejects a payload carrying a truthy
`data`, since that field has no meaning on that channel.
Also branches the signing render on the request rather than on decoded
state. Paging between two queued requests of different shapes could
otherwise commit one frame using the previous request's decoded payload.
Tests added under `signer channel` in `Extension.spec.ts`.
* feat(ui): allow generic Ledger app to derive from any chain via polkadot slip44
* feat: allow Ledger generic app accounts to sign on any chain
* fix(extension-ui): guard generic ledger init and stabilize i18n deps
* 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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