Introduce a Save Playlist UI flow: import QFileDialog, group playlist action buttons into a horizontal layout, add a new "Save Playlist As" button with styling and visibility control, and connect its click to a new save_playlist_to_file method. The new method prompts for a save location and supports saving playlist_entries in TXT, M3U, CSV, or JSON formats, shows success/error message boxes, and logs exceptions. Also wire the existing playlist visibility signal to control the save button and adjust layout placement for the playlist buttons.
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