feat(dashboard): variant images management UI

[fPolic]

What

• manage variants associated with an image from the product details page
• add Media section to the variants details page
• image and thumbnail management on the variants details page

variant-images-1759943755940.mp4

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DEPENDS ON #13623
CLOSES CORE-1217

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Latest commit: 35dee02

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8 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
api-reference	Ignored			Oct 14, 2025 1:51pm
api-reference-v2	Ignored	Preview		Oct 14, 2025 1:51pm
cloud-docs	Ignored	Preview		Oct 14, 2025 1:51pm
docs-ui	Ignored	Preview		Oct 14, 2025 1:51pm
docs-v2	Ignored	Preview		Oct 14, 2025 1:51pm
medusa-docs	Ignored	Preview		Oct 14, 2025 1:51pm
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user-guide	Ignored	Preview		Oct 14, 2025 1:51pm