feat(assistant): #94-#97 historique permanent, sidebar IA, panneau + et bouton rond

frontend/index.html

@@ -917,6 +917,20 @@
                                 style="width: 18px; height: 18px"
                             ></i>
                         </button>
+                        <button
+                            class="sidebar-tab"
+                            id="sidebar-tab-ai"
+                            role="tab"
+                            aria-selected="false"
+                            aria-controls="sidebar-panel-ai"
+                            data-tab="ai"
+                            title="Historique IA"
+                        >
+                            <i
+                                data-lucide="messages-square"
+                                style="width: 18px; height: 18px"
+                            ></i>
+                        </button>
                     </div>
 
                     <!-- Vaults panel -->
@@ -1021,6 +1035,23 @@
                             <span>Aucune recherche sauvegardee</span>
                         </div>
                     </div>
+
+                    <!-- AI history panel -->
+                    <div
+                        class="sidebar-tab-panel"
+                        id="sidebar-panel-ai"
+                        role="tabpanel"
+                        aria-labelledby="sidebar-tab-ai"
+                    >
+                        <div id="ai-history-list" class="recent-list"></div>
+                        <div id="ai-history-empty" class="recent-empty hidden">
+                            <i
+                                data-lucide="messages-square"
+                                style="width: 32px; height: 32px"
+                            ></i>
+                            <span>Aucune conversation</span>
+                        </div>
+                    </div>
                 </aside>
 
                 <!-- Sidebar resize handle -->