Frames: state-following ribbon list, DWF/DGN frames, image frame encoding and profile, frame-only picking

- The Frames list shows the drawing's frame state (hide / display and plot /
  display but not plot / frames vary), follows commands, undo and document
  switches, and lists the mixed state as a disabled item.
- DWFFRAME and DGNFRAME are frame variables of their own, kept in the header,
  and FRAME sets them with the others.
- Out-of-range frame values say "Requires an integer between 0 and 2." and
  ask again; a set value reports "Regenerating model.".
- IMAGEFRAME is stored in the image variables as bits (2 is written as 3) and
  a drawing without them uses the profile value, which setting IMAGEFRAME
  updates and the settings file keeps.
- Raster images, PDF underlays and wipeouts are picked on their frame only;
  underlay snap geometry is never picked.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/commands/mod.rs

@@ -618,6 +618,8 @@ inventory::submit!(crate::command::CommandRegistration {
         "FRAME",
         "IMAGEFRAME",
         "PDFFRAME",
+        "DWFFRAME",
+        "DGNFRAME",
         "PDFOSNAP",
         "UOSNAP",
         "PDFIMPORTMODE",
@@ -630,6 +632,7 @@ inventory::submit!(crate::command::CommandRegistration {
         "WIPEOUTFRAME",
         "FRAMES0",
         "FRAMES1",
+        "FRAMES3",
         "FRAMES2",
         "UOSNAP0",
         "UOSNAP1",