feat(plot): printer driver properties and a roomier plot dialog

Properties… next to the printer used to open the CUPS web interface in a
browser. It now edits the driver options of the *selected* printer the
way LibreOffice's Properties… does, without leaving the plot dialog:

- CUPS platforms (Linux, any desktop; macOS): an in-line editor lists the
  printer's PPD options as `lpoptions -l` reports them — media type,
  colour mode, quality, duplex, trays, scaling — with readable choice
  labels, Reset / Cancel / Apply. Apply keeps only the choices that differ
  from the driver defaults, per printer, in the plot config, and every job
  for that printer passes them as `lp -o key=value`. Where CUPS cannot
  answer, the desktop's printer settings panel opens instead of a browser.
- Windows: the driver's document-properties sheet (`DocumentPropertiesW`
  with prompt, owned by the main window) and, on OK, the result stored as
  the user's printing preferences for that printer (`SetPrinter` level 9),
  which the job honours. `printui /e` (printing preferences) replaces the
  device-properties sheet as the fallback.

The desktop print portal was tried first and dropped: GTK 4's print
dialog loses the preselected printer when the default queue is listed
before it, so the dialog always opened on the wrong printer.

Dialog layout: the modal grows to 940×620; Printer / plotter and Paper
size share a line with their pickers (long queue and media names now fit);
Copies + Properties… and Custom… sit beneath; the custom-sheet editor
labels each margin (Left / Right, Top / Bottom) and shows the unit.

Also recognises `none_device`, AutoCAD's stored spelling for "no plotter",
and writes it back unchanged.

Tests: `lpoptions` parsing and keyword humanising, the editor flow (load,
stale answer ignored, set, apply, remember, reset, error, cancel), device
name round-trips including `none_device`.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

locales/ru-RU/opencadstudio.ftl

@@ -5018,6 +5018,15 @@ plot =
     .custom-paper-size = Custom paper size
     .printable-margins = Printable margins
     .enter-a-positive-width-and-height = Enter a positive width and height.
+    .paper-size = Paper size
+    .count-driver-option-s-set-for-this-printer = __ocs_fmt_0__ driver option(s) set for this printer.
+    .printer-properties-printer = Printer properties — __ocs_fmt_0__
+    .this-printer-reports-no-driver-options = This printer reports no driver options.
+    .could-not-read-the-printer-s-options-error = Could not read the printer's options: __ocs_fmt_0__
+    .reading-the-printer-s-options = Reading the printer's options…
+    .printing-preferences-saved-for-printer = Printing preferences saved for __ocs_fmt_0__.
+    .printing-preferences-unchanged = Printing preferences unchanged.
+    .printer-properties = Printer properties
     .merge-overlapping-lines = Слияние пересекающихся линий
     .object-lineweights = Весы для объектов
     .orientation = Ориентация