Add action font theme switch

[origami-z]

Adds

• actionFont switch to UNSTABLE_SaltProviderNext
• Add theme tokens for theme and theme next
• Update Button css

3528

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Name	Status	Preview	Comments	Updated (UTC)
saltdesignsystem	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 18, 2024 4:29pm

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: b2d6fd753fef408cc9625f88072295c8b2aeb00b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

| Name | Type | | -------------- | ----- | | @salt-ds/core | Minor | | @salt-ds/theme | Minor |

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Click here if you're a maintainer who wants to add another changeset to this PR

[pseys]

I'm not sure if it's just me, but in Safari Amplitude isn't displaying correctly.

[origami-z]

I'm not sure if it's just me, but in Safari Amplitude isn't displaying correctly.

We don't host font on our website due to license issue. You'll need Amplitude installed locally