feat: route every internal signing flow through XState pipeline [PERA-3966]

[fmsouza]

Description

Funnels every internally-initiated transaction (asset opt-in, asset opt-out, payments, asset transfers, ARC-59 send / claim / reject) through the existing XState signing pipeline. Before this branch the opt-in / opt-out / send-flow hooks called useTransactionSigner + algokit.send.* directly — for Ledger accounts that path silently invoked the BLE signer with no UI overlay (the bug). After, every flow uses a new shared helper useSignAndSubmitGroup that pushes pre-built unsigned transactions through the pipeline as a headless: true, transport: 'callback' request.

• Non-Ledger accounts (HD / Algo25): zero behavioural change. headless: true skips the review sheet and post-completion notification — same brief spinner UX as today.
• Ledger accounts: get the existing LedgerSigningOverlay automatically. The pipeline's hardware actor binds phase callbacks unconditionally, so opt-in / opt-out / every send mode now shows connecting → awaiting-approval → progress → typed errors (LedgerConnectionError, LedgerTimeoutError, LedgerUserRejectedError, LedgerAddressMismatchError, LedgerAppNotOpenError, LedgerDisconnectedError).

Architecture highlights:

• New helper useSignAndSubmitGroup in packages/signing — single entry point. Resolves { txIds } after approve + submitSignedTransactionGroup; rejects with typed UserRejectedSigningError on cancel.
• ARC-59 hooks (useArc59SendTransaction, useArc59ClaimTransaction) refactored to return unsigned-tx builders (no signer arg). Send-flow consumes those and submits via the helper.
• Dead hardware-wallet branch removed from useTransactionSigner — once nothing outside the pipeline reaches it. The XState hardwareSignerActor calls signTransactionsOnHardwareWallet directly and is unaffected.
• Mobile screen consumers (AddAssetScreen, AccountAssetList, RemoveAssetsScreen, CollectibleDetailScreen, TransactionProcessingScreen, ClaimProcessingScreen) check instanceof UserRejectedSigningError and suppress the generic error toast on cancel — silent dismiss / silent goBack().
• executeSend's switch now has a default: { params.sendMode satisfies never; throw } exhaustiveness guard.

Related Issues

• closes https://algorandfoundation.atlassian.net/browse/PERA-3966

Checklist

• Have you tested your changes locally?
• Have you reviewed the code for any potential issues?
• Have you documented any necessary changes in the project's documentation?
• Have you added any necessary tests for your changes?
• Have you updated any relevant dependencies?