Wallet and Exchange

Hi @Dave, I reviewed the Canton Wallet Gateway repository and the open-source reference wallet proposal. I have 10 years of software development experience, particularly in full-stack architecture, backend systems and infrastructure. I would like to contribute directly rather than only discuss the project. I am especially interested in the Portfolio UI, browser extension, signing integrations and test coverage. Which open issue or workstream would be most useful for an external contributor to take ownership of?