review(#1624, #1637): repeat through dispatch_command; ZOOMFACTOR docs and Options test

- A blank script line outside a command repeats the last command through
  dispatch_command, as the command line's empty Enter does.
- ZOOMFACTOR bound docs describe the SETVAR range the PR widened, and the
  test keeps checking the value the Options field reaches.

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

src/app/command_driver/utilities.rs

@@ -1180,8 +1180,9 @@ impl OpenCADStudio {
             if self.tabs[i].active_cmd.is_some() {
                 return self.feed_command(StepInput::Enter);
             }
+            // Same repeat the command line's empty Enter gives.
             if let Some(cmd) = self.tabs[i].last_cmd.clone() {
-                return self.run_command_line(&cmd);
+                return self.dispatch_command(&cmd);
             }
             return Task::none();
         }

src/app/commands/styleprops.rs

@@ -3617,6 +3617,9 @@ mod tests {
         let _ = app.run_command_line("SETVAR ZOOMFACTOR 2");
         assert_eq!(app.zoom_factor, 500, "and neither is 2");
 
+        // What the Options field reached is still reported here.
+        let _ = app.update(crate::app::Message::ZoomFactorInputChanged("250".into()));
+        assert_eq!(app.zoom_factor, 250);
         let _ = app.run_command_line("SETVAR ZOOMFACTOR 60");
         assert_eq!(app.zoom_factor, 60);
     }

src/app/settings.rs

@@ -171,13 +171,11 @@ pub fn clamp_right_click_hold_ms(v: i32) -> i32 {
 
 /// ZOOMFACTOR bounds.
 ///
-/// `ZOOM_FACTOR_SYSVAR_MAX` is the range the system variable has: `SETVAR
-/// ZOOMFACTOR` accepts 3 to 100 and nothing else, so a drawing session set
-/// up on the command line stays within the range the variable has everywhere
-/// else. The Options window is the app's own surface and reaches
-/// `ZOOM_FACTOR_MAX` for anyone who wants a faster wheel than the variable
-/// can express; that value lives only in this application's own
-/// configuration file, so it is nobody else's to read.
+/// `ZOOM_FACTOR_SYSVAR_MAX` is where the Options slider stops: the range the
+/// variable has elsewhere. Both the Options field and `SETVAR ZOOMFACTOR`
+/// reach `ZOOM_FACTOR_MAX` for anyone who wants a faster wheel; the value
+/// lives only in this application's own configuration file, so it is nobody
+/// else's to read.
 pub const ZOOM_FACTOR_MIN: i32 = 3;
 pub const ZOOM_FACTOR_SYSVAR_MAX: i32 = 100;
 pub const ZOOM_FACTOR_MAX: i32 = 500;