Update OpenAI privacy copy and add privacy link in media editor

[Dimillian]

Motivation

• Clarify that OpenAI is used only optionally to generate descriptions for uploaded media and remove previous wording about a robot button.
• Make the app's privacy behavior more explicit to users who may use the generate-description feature.
• Surface a direct link to the privacy policy near the generate description control for easy access.

Description

• Updated PRIVACY.MD to state that IceCubesApp can optionally use the OpenAI API to generate descriptions for uploaded media and that nothing is sent if the feature is not used.
• Modified Packages/StatusKit/Sources/StatusKit/Editor/Components/MediaEditView.swift to replace the lone generate button with a VStack that includes the generate Button and a footnote HStack containing the text "Use OpenAI API -" and a Link to the PRIVACY.MD file.
• Kept the existing generateDescription(url:) call and behavior intact so the feature still invokes OpenAIClient when used.

Testing

• No automated tests were run for this change.
• No build or CI verification was executed as part of this PR.

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Codex Task