chore: delay linea bridge tx to make it less flaky (#29109)

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## **Description**

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1. What is the reason for the change?
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## **Related issues**

Fixes:

## **Manual testing steps**

1. Set network to Linea
2. Bridge an ERC20 to another network
3. Observe loading spinner on quotes page
4. Get redirected to activity list
5. See successful ERC20 approval and bridge tx 

## **Screenshots/Recordings**

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before and after of your change. -->

### **Before**

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### **After**

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https://github.com/user-attachments/assets/e6079f43-632e-4bd3-a9e0-54f7c427b541


## **Pre-merge author checklist**

- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask
Extension Coding
Standards](https://github.com/MetaMask/metamask-extension/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [ ] I’ve included tests if applicable
- [ ] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-extension/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

ui/pages/bridge/hooks/useSubmitBridgeTransaction.ts

@@ -2,18 +2,25 @@ import { useDispatch, useSelector } from 'react-redux';
 import { zeroAddress } from 'ethereumjs-util';
 import { useHistory } from 'react-router-dom';
 import { TransactionMeta } from '@metamask/transaction-controller';
+import { createProjectLogger, Hex } from '@metamask/utils';
 import { QuoteMetadata, QuoteResponse } from '../types';
 import { DEFAULT_ROUTE } from '../../../helpers/constants/routes';
 import { setDefaultHomeActiveTabName } from '../../../store/actions';
 import { startPollingForBridgeTxStatus } from '../../../ducks/bridge-status/actions';
 import { getQuoteRequest } from '../../../ducks/bridge/selectors';
+import { CHAIN_IDS } from '../../../../shared/constants/network';
+import { getCurrentChainId } from '../../../../shared/modules/selectors/networks';
 import useAddToken from './useAddToken';
 import useHandleApprovalTx from './useHandleApprovalTx';
 import useHandleBridgeTx from './useHandleBridgeTx';
 
+const debugLog = createProjectLogger('bridge');
+const LINEA_DELAY_MS = 5000;
+
 export default function useSubmitBridgeTransaction() {
   const history = useHistory();
   const dispatch = useDispatch();
+  const srcChainId = useSelector(getCurrentChainId);
   const { addSourceToken, addDestToken } = useAddToken();
   const { handleApprovalTx } = useHandleApprovalTx();
   const { handleBridgeTx } = useHandleBridgeTx();
@@ -33,6 +40,24 @@ export default function useSubmitBridgeTransaction() {
       });
     }
 
+    if (
+      (
+        [
+          CHAIN_IDS.LINEA_MAINNET,
+          CHAIN_IDS.LINEA_GOERLI,
+          CHAIN_IDS.LINEA_SEPOLIA,
+        ] as Hex[]
+      ).includes(srcChainId)
+    ) {
+      debugLog(
+        'Delaying submitting bridge tx to make Linea confirmation more likely',
+      );
+      const waitPromise = new Promise((resolve) =>
+        setTimeout(resolve, LINEA_DELAY_MS),
+      );
+      await waitPromise;
+    }
+
     const bridgeTxMeta = await handleBridgeTx({
       quoteResponse,
       approvalTxId: approvalTxMeta?.id,

ui/pages/bridge/prepare/bridge-cta-button.tsx

@@ -35,6 +35,7 @@ export const BridgeCTAButton = () => {
   const { maxRefreshCount, refreshRate } = useSelector(getBridgeQuotesConfig);
 
   const { submitBridgeTransaction } = useSubmitBridgeTransaction();
+  const [isSubmitting, setIsSubmitting] = useState(false);
 
   const { isNoQuotesAvailable, isInsufficientBalance } =
     useSelector(getValidationErrors);
@@ -108,20 +109,29 @@ export const BridgeCTAButton = () => {
       data-testid="bridge-cta-button"
       onClick={() => {
         if (activeQuote && isTxSubmittable) {
-          quoteRequestProperties &&
-            requestMetadataProperties &&
-            tradeProperties &&
-            trackCrossChainSwapsEvent({
-              event: MetaMetricsEventName.ActionSubmitted,
-              properties: {
-                ...quoteRequestProperties,
-                ...requestMetadataProperties,
-                ...tradeProperties,
-              },
-            });
-          submitBridgeTransaction(activeQuote);
+          try {
+            // We don't need to worry about setting to true if the tx submission succeeds
+            // because we route immediately to Activity list page
+            setIsSubmitting(true);
+
+            quoteRequestProperties &&
+              requestMetadataProperties &&
+              tradeProperties &&
+              trackCrossChainSwapsEvent({
+                event: MetaMetricsEventName.ActionSubmitted,
+                properties: {
+                  ...quoteRequestProperties,
+                  ...requestMetadataProperties,
+                  ...tradeProperties,
+                },
+              });
+            submitBridgeTransaction(activeQuote);
+          } catch (error) {
+            setIsSubmitting(false);
+          }
         }
       }}
+      loading={isSubmitting}
       disabled={!isTxSubmittable || isQuoteExpired}
     >
       {label}