ChatTabBar: + button dropdown to add chat / terminal / agent pane

Replaces single onNewChat handler with onAddPane(kind). Terminal pane
header gets matching + dropdown. Context menu "New chat" stays.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/src/components/ChatTabBar.tsx

@@ -1,5 +1,5 @@
 import { useState } from 'react';
-import { History, MessageSquare, Plus, X } from 'lucide-react';
+import { Bot, History, MessageSquare, Plus, Terminal, X } from 'lucide-react';
 import type { Chat, WorkspacePane } from '@/api/types';
 import { StatusDot } from '@/components/StatusDot';
 import {
@@ -9,6 +9,12 @@ import {
   ContextMenuSeparator,
   ContextMenuTrigger,
 } from '@/components/ui/context-menu';
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuTrigger,
+} from '@/components/ui/dropdown-menu';
 import { useLongPress } from '@/hooks/useLongPress';
 import { cn } from '@/lib/utils';
 
@@ -20,7 +26,7 @@ interface Props {
   onCloseOthers: (chatId: string) => void;
   onCloseToRight: (chatId: string) => void;
   onCloseAll: () => void;
-  onNewChat: () => void;
+  onAddPane: (kind: 'chat' | 'terminal' | 'agent') => void;
   onShowHistory: () => void;
   onRename: (chatId: string, name: string) => Promise<void>;
   onRemovePane?: () => void;
@@ -34,7 +40,7 @@ export function ChatTabBar({
   onCloseOthers,
   onCloseToRight,
   onCloseAll,
-  onNewChat,
+  onAddPane,
   onShowHistory,
   onRename,
   onRemovePane,
@@ -125,7 +131,7 @@ export function ChatTabBar({
               </div>
             </ContextMenuTrigger>
             <ContextMenuContent>
-              <ContextMenuItem onSelect={() => onNewChat()}>
+              <ContextMenuItem onSelect={() => onAddPane('chat')}>
                 New chat
               </ContextMenuItem>
               <ContextMenuSeparator />
@@ -164,15 +170,29 @@ export function ChatTabBar({
       )}
 
       <div className="flex items-center ml-auto gap-0.5 px-1 shrink-0">
+        <DropdownMenu>
+          <DropdownMenuTrigger asChild>
             <button
               type="button"
-          onClick={onNewChat}
               className="inline-flex items-center justify-center p-1 rounded text-muted-foreground hover:bg-muted hover:text-foreground max-md:min-h-[44px] max-md:min-w-[44px]"
-          aria-label="New chat"
+              aria-label="New pane"
-          title="New chat"
+              title="New pane"
             >
               <Plus size={12} />
             </button>
+          </DropdownMenuTrigger>
+          <DropdownMenuContent align="end" className="min-w-40">
+            <DropdownMenuItem onSelect={() => onAddPane('chat')}>
+              <MessageSquare size={14} /> New chat
+            </DropdownMenuItem>
+            <DropdownMenuItem onSelect={() => onAddPane('terminal')}>
+              <Terminal size={14} /> New terminal
+            </DropdownMenuItem>
+            <DropdownMenuItem onSelect={() => onAddPane('agent')}>
+              <Bot size={14} /> New agent
+            </DropdownMenuItem>
+          </DropdownMenuContent>
+        </DropdownMenu>
         <button
           type="button"
           onClick={onShowHistory}

apps/web/src/components/Workspace.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useMemo, useState } from 'react';
-import { PanelRight, MessageSquare, Terminal, Bot, Clipboard, X } from 'lucide-react';
+import { PanelRight, MessageSquare, Terminal, Bot, Clipboard, Plus, X } from 'lucide-react';
 import type { Chat, Project, Session, WorkspacePane } from '@/api/types';
 import { MAX_PANES, type UseWorkspacePanesResult } from '@/hooks/useWorkspacePanes';
 import type { UseSessionChatsResult } from '@/hooks/useSessionChats';
@@ -227,7 +227,10 @@ export function Workspace({
                   onCloseOthers={(chatId) => closeOtherTabs(idx, chatId)}
                   onCloseToRight={(chatId) => closeTabsToRight(idx, chatId)}
                   onCloseAll={() => closeAllTabs(idx)}
-                  onNewChat={() => void createChat(idx)}
+                  onAddPane={(kind) => {
+                    if (kind === 'chat') void createChat(idx);
+                    else addSplitPane(kind);
+                  }}
                   onShowHistory={() => showLandingPage(idx)}
                   onRename={renameChat}
                   onRemovePane={panes.length > 1 ? () => removePane(idx) : undefined}
@@ -239,6 +242,30 @@ export function Workspace({
                   <span className="text-xs text-muted-foreground">
                     {terminalLabels.get(pane.id) ?? 'Terminal'}
                   </span>
+                  <DropdownMenu>
+                    <DropdownMenuTrigger asChild>
+                      <button
+                        type="button"
+                        onClick={(e) => e.stopPropagation()}
+                        className="ml-auto inline-flex items-center justify-center size-5 rounded text-muted-foreground hover:bg-muted hover:text-foreground max-md:size-7"
+                        aria-label="New pane"
+                        title="New pane"
+                      >
+                        <Plus size={12} />
+                      </button>
+                    </DropdownMenuTrigger>
+                    <DropdownMenuContent align="end" className="min-w-40">
+                      <DropdownMenuItem onSelect={() => addSplitPane('chat')}>
+                        <MessageSquare size={14} /> New chat
+                      </DropdownMenuItem>
+                      <DropdownMenuItem onSelect={() => addSplitPane('terminal')}>
+                        <Terminal size={14} /> New terminal
+                      </DropdownMenuItem>
+                      <DropdownMenuItem onSelect={() => addSplitPane('agent')}>
+                        <Bot size={14} /> New agent
+                      </DropdownMenuItem>
+                    </DropdownMenuContent>
+                  </DropdownMenu>
                   {/* v1.10.4: iOS Safari restricts navigator.clipboard.readText
                       outside direct user gestures. A real button click IS a
                       gesture, so this works where keystroke-driven paste may
@@ -250,7 +277,7 @@ export function Workspace({
                       e.stopPropagation();
                       terminalsRegistry.get(pane.id)?.paste();
                     }}
-                    className="ml-auto inline-flex items-center justify-center size-5 rounded text-muted-foreground hover:bg-muted hover:text-foreground max-md:size-7"
+                    className="inline-flex items-center justify-center size-5 rounded text-muted-foreground hover:bg-muted hover:text-foreground max-md:size-7"
                     aria-label="Paste from clipboard"
                     title="Paste from clipboard"
                   >