FEAT: Create preview page

[sergiy4]

What feature?

• Create a separate Preview page.
• Add a video player there for playback (use the same one as on the home page in the modal).
• Add a button to copy the preview video link (for each card on the home page).
• When the button is clicked, send a request to the backend to generate a JWT with the video ID.
• Add an endpoint to generate a preview URL with a JWT.
• The server response should be a URL string with a JWT and videoId (preview/:jwt).
• When the response arrives, it should be copied to the clipboard.
• When a user accesses this URL, the JWT with the videoId should be extracted from the page URL, and a request should be sent to decode the JWT and retrieve the videoId, from which the videoUrl will be obtained.
• Send the video URL to the frontend.

Note:

• The JWT token should be handled for the URL since the browser address bar should not contain dots.

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Acceptance criteria

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