* feat: Add institution details to Plaid items
- Fetch and store institution URL, ID, and primary color for Plaid items
- Update PlaidItem model to retrieve and save institution metadata
- Add new method in Plaid provider to get institution details
- Update account logo view to use institution domain for logo generation
* Add institution domain method to Account model
- Extract institution domain logic from view to Account model
- Simplify logo view by using new institution_domain method
- Improve code reusability and separation of concerns
