Add fee delta to acceleration data

frontend/src/app/interfaces/electrs.interface.ts

@@ -22,6 +22,7 @@ export interface Transaction {
   acceleration?: boolean;
   acceleratedBy?: number[];
   acceleratedAt?: number;
+  feeDelta?: number;
   deleteAfter?: number;
   _unblinded?: any;
   _deduced?: boolean;

frontend/src/app/interfaces/node-api.interface.ts

@@ -31,6 +31,7 @@ export interface CpfpInfo {
   acceleration?: boolean;
   acceleratedBy?: number[];
   acceleratedAt?: number;
+  feeDelta?: number;
 }
 
 export interface RbfInfo {