fix(assistant): #91 bulle utilisateur elargie (81% du fil) + ancrage de la question des l'envoi ; docs: feuille de route outils #92

frontend/js/bookslm.js

@@ -1803,7 +1803,7 @@ class BooksLM {
       container.appendChild(this._chatBubble(msg));
     }
 
-    if (opts.anchor) this._anchorLatestUser();
+    if (opts.anchor) this._anchorLatestUser({ instant: !!opts.instant });
     else if (this._isLoading && this._pinnedTurn) this._anchorLatestUser({ instant: true });
     else container.scrollTop = prevTop;
   }
@@ -2279,7 +2279,9 @@ class BooksLM {
       .map((m) => ({ role: m.role, content: m.content }));
 
     this._messages.push({ role: 'user', content: text });
-    this._renderMessages({ anchor: true });
+    // Instant anchor: the post must already sit at the top when the answer
+    // starts streaming (a smooth animation would leave it at the bottom).
+    this._renderMessages({ anchor: true, instant: true });
 
     let provider = null;
     let model = null;
@@ -2309,8 +2311,12 @@ class BooksLM {
 
     const assistantMsg = { role: 'assistant', content: '', sources: [], toolCalls: [], confirmation: null, payload };
     this._messages.push(assistantMsg);
-    this._renderMessages();
+    // Loading must be flagged *before* this render: otherwise it would take
+    // the "restore previous scroll" branch and cancel the anchor applied to
+    // the user post, leaving the new question at the bottom until the first
+    // token arrives.
     this._isLoading = true;
+    this._renderMessages({ anchor: true, instant: true });
 
     const sendBtn = this._panel.querySelector('.bookslm-btn-send');
     if (sendBtn) sendBtn.disabled = true;