Fixed broken space-* utility on Dialog

[weylandswart]

Closes https://linear.app/ghost/issue/DES-1311/space-x-classes-in-activitypub-dont-work

Tailwind v4 doesn't like the space-* utility bound to responsive classes (Like sm:). This PR tweaks it to gap which works more reliably. Tested across a few different Dialog implementations.

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• apps/shade/src/components/ui/dialog.tsx

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Walkthrough

The pull request modifies the DialogFooter component in the dialog component file. The responsive spacing utility for small screens changes from sm:space-x-2 to sm:gap-2. This switches the spacing mechanism between footer buttons from using horizontal margin spacing to using gap-based spacing on small screen sizes. No changes are made to exported or public entity signatures.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly describes the main change: replacing a broken space-* utility with gap in the Dialog component, which matches the primary modification in the changeset.
Description check	✅ Passed	The description is directly related to the changeset, explaining the Tailwind v4 compatibility issue and why space-* was replaced with gap, and includes testing confirmation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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