Clean up duplicate files at project root

[satsdisco]

Housekeeping

These files exist at both the project root AND inside JellyAmp/:

• Theme/CypherpunkTheme.swift (root) vs JellyAmp/Theme/CypherpunkTheme.swift
• Views/NowPlayingView.swift (root) vs JellyAmp/Views/NowPlayingView.swift
• Models/MockData.swift (root) vs JellyAmp/Models/MockData.swift

Xcode uses the ones inside JellyAmp/. The root copies are dead weight from a restructuring and should be removed to avoid confusion.