Remove Enzyme usage (1/5)

### What is this about?

Replace enzyme usage in the follow files with React testing library

```
app/components/Nav/Main/index.test.tsx
app/components/Views/SimpleWebview/index.test.tsx
app/components/Views/Settings/index.test.tsx
app/components/Views/ResetPassword/index.test.tsx
app/components/Views/ManualBackupStep3/index.test.tsx
app/components/Views/ManualBackupStep2/index.test.tsx
app/components/Views/ManualBackupStep1/index.test.tsx
app/components/Views/ChoosePassword/index.test.tsx
app/components/Views/Collectible/index.test.tsx
app/components/Views/BrowserUrlModal/BrowserUrlModal.test.tsx
app/components/Views/BrowserTab/index.test.tsx
app/components/Views/AssetDetails/index.test.tsx
app/components/Approvals/WatchAssetApproval/WatchAssetApproval.test.tsx
app/components/Approvals/WalletConnectApproval/WalletConnectApproval.test.tsx
app/components/Approvals/TransactionApproval/TransactionApproval.test.tsx
app/components/Approvals/TemplateConfirmationModal/TemplateConfirmationModal.test.tsx
app/components/Approvals/SwitchChainApproval/SwitchChainApproval.test.tsx
app/components/Approvals/SignatureApproval/SignatureApproval.test.tsx
app/components/Approvals/FlowLoaderModal/FlowLoaderModal.test.tsx
app/components/Approvals/ConnectApproval/ConnectApproval.test.tsx
```

### Scenario

_No response_

### Design

_No response_

### Technical Details

_No response_

### Threat Modeling Framework

_No response_

### Acceptance Criteria

- All files listed should no longer have traces of enzyme

### Stakeholder review needed before the work gets merged

- [ ] Engineering (needed in most cases)
- [ ] Design
- [ ] Product
- [ ] QA (automation tests are required to pass before merging PRs but not all changes are covered by automation tests - please review if QA is needed beyond automation tests)
- [ ] Security
- [ ] Legal
- [ ] Marketing
- [ ] Management (please specify)
- [ ] Other (please specify)

### References

_No response_

Start by reviewing the listed app/components/**/*.test.tsx files and running their current tests to identify each file's Enzyme usage. Migrate the tests to React Testing Library, then verify that every listed file contains no remaining Enzyme traces and that the test suite passes.

Written by the indexing model from the issue text.