adjust auto-scrolling and focus behavior

web/src/App.tsx

@@ -331,6 +331,14 @@ export default function App() {
   const initialRouteSelectionRef = useRef<SidebarSelection | null>(readSidebarSelectionFromUrl());
   const hasSyncedSelectionHistoryRef = useRef(false);
 
+  const focusComposer = () => {
+    if (typeof window === "undefined") return;
+    window.requestAnimationFrame(() => {
+      const textarea = document.getElementById("composer-input") as HTMLTextAreaElement | null;
+      textarea?.focus();
+    });
+  };
+
   useEffect(() => {
     if (typeof document === "undefined") return;
     const textarea = document.getElementById("composer-input") as HTMLTextAreaElement | null;
@@ -522,8 +530,15 @@ export default function App() {
 
   useEffect(() => {
     if (draftKind === "search" || selectedItem?.kind === "search") return;
-    transcriptEndRef.current?.scrollIntoView({ behavior: "smooth", block: "end" });
-  }, [draftKind, selectedChat?.messages.length, isSending, selectedItem?.kind]);
+    transcriptEndRef.current?.scrollIntoView({ behavior: isSending ? "smooth" : "auto", block: "end" });
+  }, [draftKind, selectedChat?.messages.length, isSending, selectedItem?.kind, selectedKey]);
+
+  useEffect(() => {
+    if (isSending) return;
+    const hasWorkspaceSelection = Boolean(selectedItem) || draftKind !== null;
+    if (!hasWorkspaceSelection) return;
+    focusComposer();
+  }, [draftKind, isSending, selectedKey]);
 
   useEffect(() => {
     return () => {
@@ -994,6 +1009,7 @@ export default function App() {
       }
     } finally {
       setIsSending(false);
+      focusComposer();
     }
   };
 
@@ -1154,7 +1170,7 @@ export default function App() {
             </div>
           </header>
 
-          <div className="flex-1 overflow-y-auto px-3 py-6 md:px-10">
+          <div className={cn("flex-1 overflow-y-auto px-3 pt-6 md:px-10", isSearchMode ? "pb-6" : "pb-28 md:pb-40")}>
             {!isSearchMode ? (
               <ChatMessagesPanel messages={displayMessages} isLoading={isLoadingSelection} isSending={isSendingActiveChat} />
             ) : (