Fix #4523: a new document's VectorCraft Options start as the last native save used them

Preview, Embed ICC Profiles, Create PDF-Compatible File and the other VectorCraft Options went back to their defaults for every document not saved yet. A native Save or Save As now records the options it used in the preferences (not the artboards it picked, nor Use Compression, which its preference decides), and file.formatOptions offers them for a document not yet saved as a native file. A document saved before keeps its own.

docs/mcp.md

@@ -588,7 +588,8 @@ it replaced by the template's extension, and any other path that does not end in
 `card.png` is saved as `card.vctemplate` and `card` as `card.vctemplate`; the suggested name and the Templates folder
 come back without a path), `file.newFromTemplate {path}`, `file.revert` and `file.formatOptions {format?}` (a format's options
 with the values a save would use). Without a path the save commands return `{dataBase64, name, folder?, warnings}`. A document saved as SVG or PDF
-remembers its options, so the next save reuses them. A PDF opened with `pages`, `cropTo` or `password` is only part
+remembers its options, so the next save reuses them; a document not yet saved as a native file is offered the
+VectorCraft Options the last native Save or Save As used (not its artboards, nor Use Compression). A PDF opened with `pages`, `cropTo` or `password` is only part
 of the file, so Save asks for a new name instead of writing it back.
 `file.documentColorMode {mode, convert?, intent?, grays?}` switches the document color mode, converting the colors of
 the art (opacity masks included), symbols, graph designs, pattern tiles (with the tile that pattern editing's Cancel