Extension:UX Improvement:Consistent list interaction

Nobody has claimed this yet.

### What is this about?

See also [Draft proposal Account sorting, filtering, grouping](https://docs.google.com/document/d/18DPze8mIc0M5pTKitffmyhHncAZeTKWst9_b0k4WvmQ/edit?usp=sharing).

On Extension we recently introduced ordering of accounts. The foreseen implementation was to allow drag and drop. During implementation issues were encountered with drag and drop and existing account grouping. `Pinning` was implemented instead. On the Network list, drag and drop is available.

We want to identify and propose a general interaction pattern for list ordering that can be applied to Mobile, Extension and different lists on both platforms.

### 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 with the linked proposal on account sorting, filtering, and grouping, then compare the existing Extension account list with the Network list's drag-and-drop interaction. Define a general ordering pattern that addresses pinning, grouping, and drag-and-drop across Mobile and Extension lists. Done requires an agreed design and documented acceptance criteria, which this issue currently lacks.

Written by the indexing model from the issue text.