PdfSaveIcon

Material 3 "download" / "save" icon expressed as an inline ImageVector for the same reason as PdfShareIcon — keeps the library free of compose-material-icons-extended.

Public so consumers can reuse the glyph in their own toolbars or custom overlays alongside or instead of PdfSaveFab.

Path data lifted verbatim from the official Material Symbols set (download, filled, 24dp baseline).