Sign In / Out Toggle on Cart & Checkout Pages

[supernova-at]

Description

This PR doesn't do much, honestly 😝

It was supposed to add sign in capabilities to the Checkout page but @revanth0212 took care of that in a previous PR.

It simply tidies up a couple minor things for consistency with the Cart page.

Related Issue

Closes PWA-243.

Acceptance

Verification Stakeholders

Specification

Verification Steps

TBD

Cart Page

1. Verify the Sign In button looks and is placed according to the mockup below
2. Verify the left nav opens when the Sign In button is clicked
3. Verify nothing is displayed if the user is already signed in

Checkout Page

1. Verify the Sign In button looks and is placed according to the mockup below
2. Verify the left nav opens when the Sign In button is clicked
3. Verify nothing is displayed if the user is already signed in

Screenshots / Screen Captures (if appropriate)

Cart:

Checkout:

Checklist

• I have updated the documentation accordingly, if necessary.
• I have added tests to cover my changes, if necessary.

[PWAStudioBot]

	Messages
📖	Access a deployed version of this PR here. Make sure to wait for the "pwa-pull-request-deploy" job to complete.
📖	DangerCI Failures related to missing labels/description/linked issues/etc will persist until the next push or next nightly build run (assuming they are fixed).
📖	Associated JIRA tickets: PWA-243.

Generated by 🚫 dangerJS against 879f3a3

[soumya-ashok]

@supernova-at The mocks have been updated on the JIRA issue per our discussion. Let me know if you have any further questions.

Once a shopper signs-in either from cart or checkout, they would need to go to the account menu to sign out.

The one case we need to think about is if their session times-out and they are signed-out, they would see an empty cart so maybe we need a way to let them know that the cart items will be accessible once they sign-in again?