TRIM / EXTEND: Standard mode and TRIMEXTENDMODE (#1733)

Both commands gain a mOde option [Quick/Standard]. Quick (the default)
starts ready to pick, every object a cutting or boundary edge; Standard
starts by selecting those edges, Enter with none taking every object.
The choice is TRIMEXTENDMODE (1 Quick, 0 Standard), kept in the profile
and settable with SETVAR.

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

src/app/commands/mod.rs

@@ -756,6 +756,7 @@ inventory::submit!(crate::command::CommandRegistration {
         "UOSNAP",
         "FIELDDISPLAY",
         "FILEDIA",
+        "TRIMEXTENDMODE",
         "SURFACEASSOCIATIVITY",
         "LAYOUTCREATEVIEWPORT",
         "FIELDEVAL",