Update homepage ring to show Stream video previews

[kyeah]

Changes

• Update StreamPlayer to support fullscreen and preview CSS
• Update VideoPreview component to use StreamPlayer

Context

Adds CSS and updates the app a bit to support video previews on the homepage ring.

Testing

https://github.com/user-attachments/assets/6764d8dc-3ca4-4be9-9857-9f1dcdd9083c

Relevant Issues

Closes #39, #43

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