Add a close button to sidebar panes (#3038)

* Add a close button to sidebar panes

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* Rerun CI

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* Fix up dark mode look and feel

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

src/components/ModelingSidebar/ModelingSidebar.tsx

@@ -204,6 +204,7 @@ function ModelingSidebarSection({
                 id={`${pane.id}-pane`}
                 title={pane.title}
                 Menu={pane.Menu}
+                onClose={() => togglePane(pane.id)}
               >
                 {pane.Content instanceof Function ? (
                   <pane.Content />