deeplink: if lock screen is refreshed during deep link flow it should resume the flow, not unlock to the home page

### What is this about?

See https://github.com/MetaMask/metamask-extension/pull/33639#issuecomment-2982034787

### Scenario

_No response_

### Design

_No response_

### Technical Details

_No response_

### Threat Modeling Framework

_No response_

### Acceptance Criteria

_No response_

### 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 reading the discussion linked from PR #33639, especially the referenced issue comment, to reconstruct the deep-link and lock-screen flow. Trace where a refreshed lock screen resumes or exits that flow; done means a refresh returns the user to the active deep-link flow rather than unlocking to the home page, with behavior covered by the project's relevant tests.

Written by the indexing model from the issue text.