feat(post-summary): update to SHINE styles

[dancormier]

Description tbd

TODO

• Update docs
• Add to migration guide
• Add changeset
• Update tests
• Update visual test images
• Update Svelte components

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9f33f49

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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