The account switcher now always renders the default (starred) account first
and lets you drag the remaining accounts into any order. Default stays
pinned; only non-default rows are draggable (shown via a grip handle on
hover). Wraps each row in a draggable container and persists the new order
through the existing reorderAccounts store action.
Ordering logic extracted to pure helpers (sortDefaultFirst,
reorderNonDefaultIds) in account-utils with unit tests.
- Add AccountSwitcher component for managing user accounts with UI for switching, adding, and logging out.
- Create account state manager to handle snapshots of account-specific states for efficient switching.
- Introduce utility functions for account management, including ID generation and avatar color assignment.
- Implement Zustand store for account management, supporting addition, removal, and state retrieval of accounts.
