Fix viewport dimension acquisition and preserve measurement scaling

src/modules/annotate/linear_dim.rs

@@ -223,6 +223,17 @@ impl CadCommand for LinearDimensionCommand {
         true
     }
 
+    fn dimension_acquired_points(&self) -> Vec<DVec3> {
+        match self.step {
+            Step::FirstPoint => vec![], Step::SecondPoint(p) => vec![p],
+            Step::DimensionLine { first, second } => vec![first, second],
+        }
+    }
+
+    fn dimension_placement_pending(&self) -> bool {
+        matches!(self.step, Step::DimensionLine { .. })
+    }
+
     fn on_escape(&mut self) -> CmdResult {
         CmdResult::Cancel
     }