fix(input): fire a rebound SPACE only from the command line

#1713 dispatched a captured SPACE as a shortcut whenever it was rebound,
so with SPACE on FINALIZE a space typed into any other text field (layer
names, Properties, find) also ran FINALIZE, and the space it typed stayed
in the command line. Ask whether the command input has focus before
running the binding, and drop the space the field already inserted.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/app/update/mod.rs

@@ -23,6 +23,8 @@ fn is_modal_blocked_key_msg(msg: &Message) -> bool {
             | Message::ArrowKeyPressed { .. }
             | Message::CommandLineArrowProbe { .. }
             | Message::CommandLineArrowResolved { .. }
+            | Message::CommandLineSpaceProbe
+            | Message::CommandLineSpaceResolved
             | Message::DynTabNext
             | Message::DynTabPrev
             | Message::MTextCaretMove(_)
@@ -2314,6 +2316,24 @@ impl OpenCADStudio {
                 ))
             }
 
+            Message::CommandLineSpaceProbe => iced::widget::operation::is_focused(
+                iced::widget::Id::new(crate::ui::command_line::CMD_INPUT_ID),
+            )
+            .map(|focused| {
+                if focused {
+                    Message::CommandLineSpaceResolved
+                } else {
+                    Message::Noop
+                }
+            }),
+
+            Message::CommandLineSpaceResolved => {
+                if self.command_line.input.ends_with(' ') {
+                    self.command_line.input.pop();
+                }
+                self.update(Message::ShortcutPressed("SPACE".to_string()))
+            }
+
             Message::CommandLineArrowProbe {
                 direction,
                 extend_selection,