fix: Settings TOC order now matches sections exactly

- Split merged <li> containing both cfg-about and cfg-themes
- Reordered: search, sync, diags, ai, themes, profile, about
- All 7 TOC links now match section IDs 1:1

frontend/index.html

@@ -1368,33 +1368,28 @@
                                 X
                             </button>
                         </div>
-                        <ul class="help-nav-list">
-                            <li>
+                        
+<li>
                                 <a href="#cfg-search" class="help-nav-link"
                                      data-i18n="help.nav_search">🔍 Recherche</a
                                 >
                             </li>
-                            
-                            <li>
+<li>
                                 <a href="#cfg-sync" class="help-nav-link"
                                      data-i18n="settings.sync">🔄 Synchronisation</a
                                 >
                             </li>
-                            <li>
+<li>
                                 <a href="#cfg-diags" class="help-nav-link"
                                      data-i18n="settings.diagnostics">🩺 Diagnostics</a
                                 >
                             </li>
-                            <li>
+<li>
                                 <a href="#cfg-ai" class="help-nav-link"
                                      data-i18n="settings.ai">🤖 IA</a
                                 >
                             </li>
-                            <li>
-                                <a href="#cfg-about" class="help-nav-link"
-                                     data-i18n="settings.about">📦 A propos</a
-                                >
-                                <a href="#cfg-themes" class="help-nav-link"
+<li><a href="#cfg-themes" class="help-nav-link"
                                      data-i18n="settings.themes">🎨 Themes</a
                                 >
                             </li>
@@ -1403,8 +1398,13 @@
                                      data-i18n="settings.profile">👤 Profil</a
                                 >
                             </li>
-                            
-                        </ul>
+<li>
+                                <a href="#cfg-about" class="help-nav-link"
+                                     data-i18n="settings.about">📦 A propos</a
+                                >
+</li>
+
+
                     </nav>
                     <div class="help-content" id="config-scroll">
                         <div class="config-content">