feat(hwi): add hwi sign subcommand

- add signing psbt with hardware wallet

Author: tvpeter

src/commands.rs

@@ -474,6 +474,11 @@ pub enum HwiSubCommand {
     Register,
     /// Generate address
     Address,
+    /// Sign PSBT with hardware wallet
+    Sign {
+        /// The base64-encoded PSBT to sign
+        psbt: String,
+    },
 }
 
 /// Subcommands available in REPL mode.

src/handlers.rs

@@ -379,6 +379,26 @@ pub async fn handle_offline_wallet_subcommand(
                 let address = wallet.next_unused_address(KeychainKind::External);
                 Ok(json!({ "address": address.address }))
             }
+            HwiSubCommand::Sign { psbt } => {
+                let mut psbt = Psbt::from_str(&psbt)
+                    .map_err(|e| Error::Generic(format!("Failed to parse PSBT: {e}")))?;
+                let device = crate::utils::connect_to_hardware_wallet(
+                    wallet.network(),
+                    wallet_opts,
+                    Some(wallet),
+                )
+                .await?;
+                let signed_psbt = if let Some(device) = device {
+                    device
+                        .sign_tx(&mut psbt)
+                        .await
+                        .map_err(|e| Error::Generic(format!("Failed to sign PSBT: {e}")))?;
+                    Some(psbt.to_string())
+                } else {
+                    None
+                };
+                Ok(json!({ "psbt": signed_psbt }))
+            }
         },
     }
 }
@@ -837,7 +857,7 @@ pub(crate) async fn handle_command(cli_opts: CliOpts) -> Result<String, Error> {
                 wallet.persist(&mut persister)?;
                 result
             };
-            // #[cfg(not(any(feature = "sqlite")))]
+            #[cfg(not(any(feature = "sqlite")))]
             let result = {
                 let wallet = new_wallet(network, &wallet_opts)?;
                 let blockchain_client =