temp+fix: validate chain before send (#12048)

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## **Description**

This PR validates the chain id before handling the deeplink for making
an ethereum send.

## **Related issues**

Fixes: [11966](#11966)

## **Manual testing steps**

1. Open the deeplink
https://metamask.app.link/send/0x2990079bcdEe240329a520d2444386FC119da21a@56?value=3e18
2. Ensure that BNB is not added as a chain on the wallet
3. You should see an error "Unable to find network with chain id"

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

https://github.com/user-attachments/assets/c790fcdc-7737-4718-b5b5-f117151ea0a2

## **Pre-merge author checklist**

- [x] I’ve followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/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-mobile/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.

app/core/DeeplinkManager/Handlers/switchNetwork.test.ts

@@ -44,13 +44,13 @@ describe('switchNetwork', () => {
     );
   });
 
-  it('should not dispatch an alert for an invalid switchToChainId', () => {
-    const switchToChainId = 'invalid_chain_id' as `${number}` | undefined;
+  it('should throw an error for an invalid switchToChainId', () => {
+    const switchToChainId = '56' as `${number}` | undefined;
     mockHandleNetworkSwitch.mockReturnValue(undefined);
 
-    switchNetwork({ deeplinkManager, switchToChainId });
-
-    expect(deeplinkManager.dispatch).not.toHaveBeenCalled();
+    expect(() => switchNetwork({ deeplinkManager, switchToChainId })).toThrow(
+      `Unable to find network with chain id ${switchToChainId}`,
+    );
   });
 
   it('should not dispatch an alert when switchNetwork returns undefined', () => {

app/core/DeeplinkManager/Handlers/switchNetwork.ts

@@ -4,6 +4,10 @@ import { handleNetworkSwitch } from '../../../util/networks';
 import DevLogger from '../../SDKConnect/utils/DevLogger';
 import DeeplinkManager from '../DeeplinkManager';
 
+import { selectChainId } from '../../../selectors/networkController';
+import { store } from '../../../store';
+import { toHex } from '@metamask/controller-utils';
+
 function switchNetwork({
   deeplinkManager,
   switchToChainId,
@@ -15,11 +19,16 @@ function switchNetwork({
     typeof switchToChainId === 'number' ||
     typeof switchToChainId === 'string'
   ) {
-    const chainId = String(switchToChainId);
-
-    const networkName = handleNetworkSwitch(chainId);
+    const newChainId = String(switchToChainId);
+    const networkName = handleNetworkSwitch(newChainId);
 
-    if (!networkName) return;
+    if (!networkName) {
+      const activeChainId = selectChainId(store.getState());
+      if (activeChainId === toHex(newChainId)) {
+        return;
+      }
+      throw new Error(`Unable to find network with chain id ${newChainId}`);
+    }
 
     deeplinkManager.dispatch(
       showAlert({