fix: refactor getFeeEstimates, add comments to getFees

Author: limpbrains

src/utils/lightning/index.ts

@@ -253,6 +253,7 @@ export const getFees: TGetFees = async () => {
 		});
 	};
 
+	// fetch, validate and map fees from mempool.space to IOnchainFees
 	const fetchMp = async (): Promise<IOnchainFees> => {
 		const f1 = await fetch('https://mempool.space/api/v1/fees/recommended');
 		const j: IGetFeeEstimatesResponse = await f1.json();
@@ -276,6 +277,7 @@ export const getFees: TGetFees = async () => {
 		};
 	};
 
+	// fetch, validate and map fees from Blocktank to IOnchainFees
 	const fetchBt = async (): Promise<IOnchainFees> => {
 		const f2 = await fetch('https://api1.blocktank.to/api/info');
 		const j: IBtInfo = await f2.json();

src/utils/wallet/transactions.ts

@@ -905,11 +905,7 @@ export const getFeeEstimates = async (
 		}
 
 		const wallet = await getOnChainWalletAsync();
-		const feeRes = await wallet.updateFeeEstimates(forceUpdate);
-		if (feeRes.isErr()) {
-			return err(feeRes.error);
-		}
-		return ok(feeRes.value);
+		return wallet.updateFeeEstimates(forceUpdate);
 	} catch (e) {
 		return err(e);
 	}