* Add the atp-agent implementation (temporarily in this repo)
* Rewrite all session & API management to use the new atp-agent
* Update tests for the atp-agent refactor
* Refactor management of session-related state. Includes:
- More careful management of when state is cleared or fetched
- Debug logging to help trace future issues
- Clearer APIs overall
* Bubble session-expiration events to the user and display a toast to explain
* Switch to the new @atproto/api@0.1.0
* Rework 'navIdx' variables from number arrays to strings to avoid equality-check failures in react hooks
* Resolve all remaining lint issues
* Fix tests
* Use node v18 in gh action test
* Update the account-create and signin views to use the design system.
Also:
- Add borderDark to the theme
- Start to an account selector in the signin flow
* Dark mode fixes in signin ui
* Track multiple active accounts and provide account-switching UI
* Add test tooling for an in-memory pds
* Add complete integration tests for login and the account switcher