fix(mleader): improve behavior and persistence

Keep annotation contexts, grip placement, and style dictionary entries consistent across editing and file saves.

Refs #779

src/app/update/command.rs

@@ -1673,9 +1673,18 @@ pub(super) fn on_tab_close(&mut self, idx: usize) -> Task<Message> {
                         }
                     }
                     StyleKey::MLeaderStyle => {
-                        self.ribbon.active_mleader_style = name.clone();
                         let i = self.active_tab;
-                        self.tabs[i].active_mleader_style = name;
+
+                        self.ribbon.active_mleader_style = name.clone();
+                        self.tabs[i].active_mleader_style = name.clone();
+
+                        self.tabs[i]
+                            .scene
+                            .document
+                            .header
+                            .current_mleader_style_name = name;
+
+                        self.tabs[i].dirty = true;
                     }
                     StyleKey::TableStyle => {
                         self.ribbon.active_table_style = name;