feat(snap): add transparent object snap overrides in active commands

Allow users to temporarily override object snaps during active point prompts by typing at least the first 3 letters of any snap mode (e.g. MID, END, CEN, PER, NON). The override activates for the next point pick only and automatically restores running snaps once consumed or cancelled.

src/app/command_driver/utilities.rs

@@ -583,6 +583,7 @@ impl OpenCADStudio {
             if !self.record_accepted_snap(i, None, None, *point) {
                 return (Task::none(), true);
             }
+            self.snapper.clear_override();
         }
         if default_start {
             let StepInput::Point(point) = &input else {
@@ -1113,6 +1114,27 @@ impl OpenCADStudio {
                 return Task::none();
             }
         }
+        if let Some(override_kind) = crate::snap::parse_snap_override(token) {
+            let is_point_step = !self.tabs[i]
+                .active_cmd
+                .as_ref()
+                .map(|c| c.input_kind().wants_text())
+                .unwrap_or(true)
+                || self.tabs[i]
+                    .active_cmd
+                    .as_ref()
+                    .map(|c| c.point_step_accepts_keywords())
+                    .unwrap_or(false);
+            let not_entity_pick = !self.tabs[i]
+                .active_cmd
+                .as_ref()
+                .map(|c| c.needs_entity_pick())
+                .unwrap_or(false);
+            if is_point_step && not_entity_pick {
+                self.apply_snap_override(override_kind);
+                return Task::none();
+            }
+        }
         if let Some((coord, kind)) = crate::app::helpers::parse_coord(token) {
             // Match the GUI command line: typed coordinates are in the active
             // UCS (relative offsets are rotated by the UCS axes), so a multi-