Hide App navigation on a narrow screen until the user opens it.

A width at or below Nextcloud's 1024px breakpoint keeps the tree off the page so the content stays usable, and the navigation button brings it back.

Co-authored-by: Cursor <cursoragent@cursor.com>

dialog_test.go

@@ -59,6 +59,7 @@ func dialogFixture() http.Handler {
 		},
 	}
 	mux.Handle("GET /shell", nav.Handler())
+	mux.Handle("GET /nav", sampleNavigation().Handler())
 	return mux
 }