Fix: prevent flash of "Untitled" when loading a document w/ preview

[ryanbonial]

Description

This PR fixes the quick flash of a Document's title as "Untitled" if the document has a preview (e.g. the movie database template) by adding a ready check before showing the Document pane.

What to review

Verify that there is not a case where we should show the Document pane, but the Document is not ready.

Testing

1. npm create sanity@latest
2. Choose the movie database template, typescript
3. npm run dev
4. Visit http://localhost:3333/structure/movie and click on the various movies in the list. You should no longer seewill see "Untitled" flash as their title.

Notes for release

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Name	Status	Preview	Comments	Updated (UTC)
page-building-studio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 17, 2024 11:10pm
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1 Skipped Deployment

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studio-workshop	⬜️ Ignored (Inspect)	Visit Preview		Sep 17, 2024 11:10pm

[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Sep 17, 2024 11:14 PM (UTC)

✅ All Tests Passed -- expand for details

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	44s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	9s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	31s	6	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	37s	11	7	0
formBuilder/inputs/PortableText/copyPaste/CopyPasteFields.spec.tsx	✅ Passed (Inspect)	0s	0	12	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	18s	6	0	0
formBuilder/inputs/PortableText/DisableFocusAndUnset.spec.tsx	✅ Passed (Inspect)	11s	3	0	0
formBuilder/inputs/PortableText/DragAndDrop.spec.tsx	✅ Passed (Inspect)	3m 0s	0	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	46s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	1m 43s	21	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 17s	18	0	0
formBuilder/inputs/PortableText/PresenceCursors.spec.tsx	✅ Passed (Inspect)	9s	3	9	0
formBuilder/inputs/PortableText/RangeDecoration.spec.tsx	✅ Passed (Inspect)	27s	9	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	18s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	36s	12	0	0
formBuilder/tree-editing/TreeEditing.spec.tsx	✅ Passed (Inspect)	0s	0	3	0
formBuilder/tree-editing/TreeEditingNestedObjects.spec.tsx	✅ Passed (Inspect)	0s	0	3	0