[WIP] [PC TV] Derive playlist pill colour from front cover artwork

[Copilot]

Thanks for the feedback on #4561. I've created this new PR, which merges into #4561, to address your comment. I will work on the changes and keep this PR's description up to date as I make progress.

Original PR: #4561
Triggering comment (#4561 (comment)):

Review feedback addressed

• PlaylistDetailsViewModel.swift:188 (@copilot): hoist fallback palette to a static let — Done in 7f2df70
• PlaylistDetailsViewModel.swift:140 (@kean): cache playlistColor so it isn't recomputed on every body — Done in 0b6c840
• General (@kean): reduce the number of code comments — Done in 8c3ad3d
• Testing notes (@kean): darker tints / two playlists landing on the same fallback colour — acknowledged; deferred to a follow-up PR so this one stays scoped to the review fixes

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[dangermattic]

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[Copilot]

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