Route sidebar toggle through set_active_sidebar_width

`toggle_sidebar_width` set the new width via core directly, bypassing
the picker-dismiss + hover-expand reset that lives in
`set_active_sidebar_width`. So the user could open the workspace
popover, hit toggle, see the sidebar collapse, and the popover would
reappear on re-expand because the flag never cleared.

Forward toggle through the same entry point. One sidebar-resize code
path for the keyboard, the toggle button, and the drag handle.

crates/ely_app/src/shell/sidebar.rs

@@ -112,9 +112,12 @@ impl ElyShell {
             COLLAPSED_SIDEBAR_WIDTH_PX
         };
 
-        if core.set_space_sidebar_width(&snapshot.active_space_id, next_width).is_ok() {
+        // Route through `set_active_sidebar_width` instead of poking
-            cx.notify();
+        // `core.set_space_sidebar_width` directly so the same
-        }
+        // popover-dismiss + hover-expand reset logic applies whether
+        // the user toggles via the keyboard / button or the resize
+        // drag.
+        self.set_active_sidebar_width(next_width, cx);
     }
 
     pub(crate) fn set_active_sidebar_width(&mut self, width_px: u16, cx: &mut Context<Self>) {