Stop propagation on tab close so the row doesn't re-select

The launcher row's `on_click` selects the tab. Its child close glyph
also has its own `on_click` that selects + closes. After the close,
the click bubbled up to the row, which then tried to re-select the
tab we just removed — usually a no-op but a wasted state churn that
can race with the close in BrowserCore.

Add `cx.stop_propagation()` after the close handler so the click
ends at the close glyph.

crates/ely_app/src/shell/chrome/sidebar.rs

@@ -273,8 +273,12 @@ impl ElyShell {
                     .hover(|style| style.bg(rgba(0x281e1414)).text_color(rgb(colors::INK)))
                     .cursor_pointer()
                     .on_click(cx.listener(move |shell, _, window, cx| {
+                        // Close the tab without bubbling to the launcher row's
+                        // own on_click — otherwise the row tries to re-select
+                        // the tab right after we've closed it.
                         shell.select_tab(&close_tab_id, window, cx);
                         shell.close_active_tab(window, cx);
+                        cx.stop_propagation();
                     }))
                     .child(IconName::Close),
             )