Client types: support multi-transaction SignTransactionRequest

Add TransactionData type and extend SignTransactionRequestStandard to
accept either inline single-tx fields or a transactions array. Return
type now includes SignTransactionResults for multi-tx responses.

Author: Mathéo

.gitignore

@@ -9,3 +9,4 @@ deployment-keyguard-next
 dist
 .ts-out
 src/translations/index.js
+CLAUDE.md

client/src/PublicRequest.ts

@@ -55,6 +55,9 @@ export type TransactionInfo = {
     flags?: number,
 };
 
+// TransactionInfo without keyPath (keyPath is at request level for multi-transaction support)
+export type TransactionData = Omit<TransactionInfo, 'keyPath'>;
+
 export enum BitcoinTransactionInputType {
     STANDARD = 'standard',
     HTLC_REDEEM = 'htlc-redeem',
@@ -167,10 +170,17 @@ export type ExportResult = {
 
 type SignTransactionRequestCommon = SimpleRequest & TransactionInfo;
 
-export type SignTransactionRequestStandard = SignTransactionRequestCommon & {
+// Standard layout supports both single and multiple transactions
+export type SignTransactionRequestStandard = SimpleRequest & {
+    keyPath: string,
     layout?: 'standard',
-    recipientLabel?: string,
-};
+    recipientLabel?: string, // Only used for single-tx display
+} & (
+    // Option A: Single transaction (backward compatible - fields directly on request)
+    TransactionData |
+    // Option B: Multiple transactions
+    { transactions: TransactionData[] | Uint8Array[] }
+);
 
 export type SignTransactionRequestCheckout = SignTransactionRequestCommon & {
     layout: 'checkout',
@@ -616,6 +626,8 @@ export type ListLegacyResult = LegacyKeyInfoObject[];
 export type SignTransactionResult = SignatureResult & {
     serializedTx: Uint8Array,
 };
+// Array result type for multi-transaction signing
+export type SignTransactionResults = SignTransactionResult[];
 export type SignStakingResult = SignatureResult & {
     transaction: Uint8Array,
 };
@@ -653,6 +665,7 @@ export type RedirectResult
     | SignatureResult
     | ConnectResult
     | SignTransactionResult
+    | SignTransactionResults
     | SignStakingResult[]
     | SignedBitcoinTransaction
     | SignedPolygonTransaction
@@ -667,7 +680,7 @@ export type Result = RedirectResult | IFrameResult;
 
 export type ResultType<T extends RedirectRequest> =
     T extends Is<T, SignMessageRequest> ? SignatureResult :
-    T extends Is<T, SignTransactionRequest> ? SignTransactionResult :
+    T extends Is<T, SignTransactionRequest> ? SignTransactionResult | SignTransactionResults :
     T extends Is<T, SignMultisigTransactionRequest> ? SignatureResult :
     T extends Is<T, SignStakingRequest> ? SignStakingResult[] :
     T extends Is<T, ConnectRequest> ? ConnectResult :
@@ -684,7 +697,7 @@ export type ResultType<T extends RedirectRequest> =
 
 export type ResultByCommand<T extends KeyguardCommand> =
     T extends KeyguardCommand.SIGN_MESSAGE ? SignatureResult :
-    T extends KeyguardCommand.SIGN_TRANSACTION ? SignTransactionResult :
+    T extends KeyguardCommand.SIGN_TRANSACTION ? SignTransactionResult | SignTransactionResults :
     T extends KeyguardCommand.SIGN_MULTISIG_TRANSACTION ? SignatureResult :
     T extends KeyguardCommand.SIGN_STAKING ? SignStakingResult[] :
     T extends KeyguardCommand.CONNECT_ACCOUNT ? ConnectResult :

types/Keyguard.d.ts

@@ -311,8 +311,11 @@ type Is<T, B> = KeyguardRequest.Is<T, B>;
 
 type Parsed<T extends KeyguardRequest.Request> =
     T extends Is<T, KeyguardRequest.SignTransactionRequestStandard> ?
-        ConstructTransaction<KeyId2KeyInfo<KeyguardRequest.SignTransactionRequestStandard>>
-        & { layout: KeyguardRequest.SignTransactionRequestLayout } :
+        KeyId2KeyInfo<KeyguardRequest.SignTransactionRequestStandard>
+        & {
+            layout: KeyguardRequest.SignTransactionRequestLayout,
+            transactions: Nimiq.Transaction[], // Always an array internally (even for single tx)
+        } :
     T extends Is<T, KeyguardRequest.SignTransactionRequestCheckout> ?
         Transform<
             ConstructTransaction<KeyId2KeyInfo<KeyguardRequest.SignTransactionRequestCheckout>>,