style: cargo fmt the Ark wallet merge (release-gate fmt guard)

Formatting only — no logic changes to PR #78.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

core/archipelago/src/api/rpc/ark.rs

@@ -55,14 +55,20 @@ impl RpcHandler {
                 }))
             }
         };
-        let bal = client.balance().await.unwrap_or_else(|_| serde_json::json!({}));
+        let bal = client
+            .balance()
+            .await
+            .unwrap_or_else(|_| serde_json::json!({}));
         let sat = |key: &str| bal.get(key).and_then(|v| v.as_u64()).unwrap_or(0);
         let spendable = sat("spendable_sat");
         let pending = sat("pending_in_round_sat")
             + sat("pending_board_sat")
             + sat("pending_lightning_send_sat")
             + sat("claimable_lightning_receive_sat")
-            + bal.get("pending_exit_sat").and_then(|v| v.as_u64()).unwrap_or(0);
+            + bal
+                .get("pending_exit_sat")
+                .and_then(|v| v.as_u64())
+                .unwrap_or(0);
         let onchain = client
             .onchain_balance()
             .await