Update New SRP onboarding flow for Backup Skip Screen

### What is this about?

Update New SRP onboarding flow as per figma design
https://www.figma.com/design/pViOUcmjwhEzFsdrwknpNc/Onboarding-redesign?node-id=434-55200&t=wmEoQSF9g9lFtkwp-0

This PR is part 5 of 7 for the new SRP ui update

This PR cover

Account Backup step 1 ui update
skip backup bottom sheet prompt Account Backup step 1 screen
reminder backup bottom sheet at main wallet screen

### Scenario

_No response_

### Design

_No response_

### Technical Details

_No response_

### Threat Modeling Framework

_No response_

### Acceptance Criteria

- Bottom sheet should be prompt when user try to skip backup flow
- User will navigate to backup flow when pressed on the secure now
- New ui screen as per figma

New figma screen

New Bottom Sheet

### 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 with the current New SRP onboarding Account Backup step 1 and main wallet reminder behavior, then compare them with the linked Figma design. The issue names no files or tests, so identify the existing onboarding entry points before implementing the skip prompt, Secure Now navigation, and updated screens; done means the listed acceptance criteria are met.

Written by the indexing model from the issue text.