Reorganize the Download Settings dialog into a SmoothTabWidget with three tabs (General, Format, File) and move existing group sections into corresponding tab layouts. Import QWidget and SmoothTabWidget, increase dialog minimum width from 450 to 550, and add stretches for better layout spacing. Overhaul the dialog stylesheet to restyle tabs, frames, group boxes, checkboxes, radio buttons, combo boxes and item views (borders, paddings, colors, radii, hover/selected states). Also style OK/Cancel buttons to match the Custom Options dialog. These changes improve the dialog's visual consistency and UX while preserving existing settings controls and behavior.
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