feat(structure): support closing first collapsed DocumentPanel

[rdunk]

Description

Presently, if a DocumentPanel is both in its collapsed state and also the first pane, neither a back button nor a close button can be displayed.

Presentation tool uses the DocumentPanel without any other panes, but also needs to support a collapsed state to prevent the inspector causing overflow issues.

This PR lifts some logic for displaying the DocumentPanel close button, relying on the presence of a provided BackLink, which Structure's PaneRouterProvider will now only pass if the pane is not the first. Presentation's router provider can therefore always pass a BackLink and display a close button even in a collapsed state.

What to review

There should be no changes within Structure tool, with the close and back buttons rendering as expected. The buttons should also both still be hidden if a user defines structure without multiple panes, e.g.

structureTool({
  structure: (S) =>
    S.document()
      .schemaType('page')
      .documentId('some-id'),
})

Testing

Notes for release

N/A. This is an internal feature.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
performance-studio	✅ Ready (Inspect)	Visit Preview		Feb 27, 2024 6:40pm
test-studio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 27, 2024 6:40pm

1 Ignored Deployment

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studio-workshop	⬜️ Ignored (Inspect)			Feb 27, 2024 6:40pm

[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Feb 27, 2024 6:45 PM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	34s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	5s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	12s	3	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	12s	4	2	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	12s	6	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	31s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	59s	15	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 1s	18	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	12s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	19s	9	0	0

[juice49]

Looks good to me!