feat(toc,explorer): add accessibility for toggle (#1327)

Andrew

2024-08-09 27a41abb62cc9005ed4234bdb02f38b6cfeedec3

 quartz/components/Explorer.tsx

@@ -91,6 +91,8 @@
          data-collapsed={opts.folderDefaultState}
          data-savestate={opts.useSavedState}
          data-tree={jsonTree}
          aria-controls="explorer-content"
          aria-expanded={opts.folderDefaultState === "open"}
        >
          <h2>{opts.title ?? i18n(cfg.locale).components.explorer.title}</h2>
          <svg