fix: reorder Settings TOC + fix Hidden Files link

- Removed Performance from TOC
- Order: Search, Recent, Backend, Tags, Sync, Hidden, Webhooks, Shares, Diags, AI, Themes, Profile, About
- Fixed Hidden Files id

frontend/index.html

@@ -1373,16 +1373,13 @@
                                     <a href="#cfg-search" class="help-nav-link" data-i18n="help.nav_search"></a>
                                 </li>
                                 <li>
-                                    <a href="#cfg-performance" class="help-nav-link" data-i18n="config.section_perf"></a>
-                                </li>
-                                <li>
-                                    <a href="#cfg-tags" class="help-nav-link" data-i18n="config.section_tags"></a>
+                                    <a href="#cfg-recent" class="help-nav-link" data-i18n="config.section_recent"></a>
                                 </li>
                                 <li>
                                     <a href="#cfg-backend-settings" class="help-nav-link" data-i18n="config.section_backend"></a>
                                 </li>
                                 <li>
-                                    <a href="#cfg-recent" class="help-nav-link" data-i18n="config.section_recent"></a>
+                                    <a href="#cfg-tags" class="help-nav-link" data-i18n="config.section_tags"></a>
                                 </li>
                                 <li>
                                     <a href="#cfg-sync" class="help-nav-link" data-i18n="settings.sync"></a>