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",

src/app/commands/styleprops.rs

@@ -1214,6 +1214,7 @@ impl OpenCADStudio {
                     | "UOSNAP"
                     | "FIELDDISPLAY"
                     | "FILEDIA"
+                    | "TRIMEXTENDMODE"
                     | "SURFACEASSOCIATIVITY"
                     | "UCSORTHO"
                     | "UCSVIEW"
@@ -1603,6 +1604,33 @@ impl OpenCADStudio {
                         }
                         return Some(self.finish_dispatch(cmd));
                     }
+                    if name == "TRIMEXTENDMODE" {
+                        use crate::modules::draw::modify::trim;
+                        let current = i16::from(trim::quick_mode());
+                        let prompt = format!("Enter new value for TRIMEXTENDMODE <{current}>:");
+                        match value
+                            .as_deref()
+                            .map(|v| v.trim().parse::<i16>().ok().filter(|v| (0..=1).contains(v)))
+                        {
+                            Some(Some(mode)) => {
+                                if current != mode {
+                                    trim::set_quick_mode(mode == 1);
+                                    self.save_config();
+                                }
+                            }
+                            Some(None) => {
+                                self.command_line
+                                    .push_error(crate::t!("Requires 0 or 1 only.").as_ref());
+                                self.command_line.push_output(&prompt);
+                                self.pending_setvar = Some(name.clone());
+                            }
+                            None => {
+                                self.command_line.push_output(&prompt);
+                                self.pending_setvar = Some(name.clone());
+                            }
+                        }
+                        return Some(self.finish_dispatch(cmd));
+                    }
                     if name == "FILEDIA" {
                         let current = i16::from(crate::sys::file_dia());
                         match value