An alert is now shown when the user switches from an account that is
connected to the active tab to an account that is not connected. The
alert prompts the user to dismiss the alert or connect the account
they're switching to.
The "loading" state is handled by disabling the buttons, and the error
state is handled by displaying a generic error message and disabling
the connect button.
The new reducer for this alert has been created with `createSlice` from
the Redux Toolkit. This utility is recommended by the Redux team, and
represents a new style of writing reducers that I hope we will use more
in the future (or at least something similar). `createSlice` constructs
a reducer, actions, and action creators automatically. The reducer is
constructed using their `createReducer` helper, which uses Immer to
allow directly mutating the state in the reducer but exposing these
changes as immutable.
We don't need to store the current UI type as a global. We're already
using the `getEnvironmentType` helper function throughout the UI, so
we'd might as well use that instead of this global state.
Two tabs have been created on the home screen: 'Assets' and 'History'.
This tabbed view is shown only on small screens (e.g. in the popup).
The fullscreen view is unchanged.
The toggle-able left sidebar no longer exists, so some 'sidebar-left'
specific code and styles have been removed. The button in the menu bar
has been removed as well.
The 'History' title of the transaction history is now redundant when
where are no pending transactions, so it as been conditionally hidden.
A passthrough for `data-testid` has been added to the Tab component for
convenience in e2e tests.
This commit updates the existing _Connected Sites_ section to a modal using
the `Popover` component. This will serve as a base for the new modal design.
