[Extension] Network avatar shape change

### What is this about?

https://www.figma.com/design/iJhERJwWooEVpkXJl6ulgi/Network-avatar-shape?node-id=0-1&t=r5WdNDIkTVsGFzfx-1

Updating the shape of the network avatar to square(ish), specs in Figma;
In addition, when the network is a badge, it will be bottom-right instead of top-right.

### 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)
- [x] 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 linked Figma design to understand the square-ish network avatar and the bottom-right badge placement. Then locate the network avatar and badge rendering entry points in the extension and verify the finished UI matches the Figma specifications.

Written by the indexing model from the issue text.