fix(ui): show send action in collapsed mobile composer (#3247)

Thanks for refining the action placement. This keeps New chat available while idle and preserves Abort while a response is running. We will finish the repository-specific cleanup in the same batch.

packages/ui/src/components/chat/ChatInput.tsx

@@ -3043,10 +3043,12 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({
                         canAbort={canAbort}
                         footerIconButtonClass={footerIconButtonClass}
                         iconSizeClass={iconSizeClass}
+                        sendIconSizeClass={sendIconSizeClass}
                         stopIconSizeClass={stopIconSizeClass}
                         theme={currentTheme}
                         onExpand={mobileShell.expand}
                         onApplySuggestion={applyAssistSuggestion}
+                        onPrimaryAction={handlePrimaryAction}
                         onNewSession={handleMobileNewSession}
                         onPickLocalFiles={handlePickLocalFiles}
                         onOpenIssuePicker={openIssuePicker}

packages/ui/src/components/chat/composer/ui/MobilePillComposer.test.tsx

@@ -0,0 +1,94 @@
+import React from 'react';
+import { describe, expect, mock, test } from 'bun:test';
+import { renderToStaticMarkup } from 'react-dom/server';
+
+import { I18nProvider } from '@/lib/i18n';
+import { getDefaultTheme } from '@/lib/theme/themes';
+
+mock.module('@/components/chat/SessionGoalRow', () => ({
+    SessionGoalRow: () => null,
+}));
+mock.module('@/components/chat/SessionSuggestionChip', () => ({
+    SessionSuggestionChip: () => null,
+}));
+mock.module('./ComposerAttachmentControls', () => ({
+    ComposerAttachmentControls: () => null,
+}));
+
+const { MobilePillComposer } = await import('./MobilePillComposer');
+
+const renderPill = (options: { hasContent: boolean; newSessionDraftOpen: boolean; canAbort?: boolean }) => renderToStaticMarkup(
+    <I18nProvider>
+        <MobilePillComposer
+            message={options.hasContent ? 'Draft message' : ''}
+            sessionId={options.newSessionDraftOpen ? null : 'session-1'}
+            newSessionDraftOpen={options.newSessionDraftOpen}
+            hasContent={options.hasContent}
+            isVSCode={false}
+            canAbort={options.canAbort ?? false}
+            footerIconButtonClass="icon-button"
+            iconSizeClass="icon-size"
+            sendIconSizeClass="send-icon-size"
+            stopIconSizeClass="stop-icon-size"
+            theme={getDefaultTheme(false)}
+            onExpand={() => {}}
+            onApplySuggestion={() => {}}
+            onPrimaryAction={() => {}}
+            onNewSession={() => {}}
+            onPickLocalFiles={() => {}}
+            onOpenIssuePicker={() => {}}
+            onOpenPrPicker={() => {}}
+            onOpenAttachSheet={() => {}}
+            onStartDictation={() => {}}
+            onAbort={() => {}}
+        />
+    </I18nProvider>,
+);
+
+describe('MobilePillComposer', () => {
+    test('uses the inline action to send content while the session is idle', () => {
+        const markup = renderPill({ hasContent: true, newSessionDraftOpen: false });
+
+        expect(markup).toContain('aria-label="Send message"');
+        expect(markup).toContain('aria-label="New chat"');
+        expect(markup.indexOf('aria-label="Send message"')).toBeLessThan(markup.indexOf('aria-label="New chat"'));
+    });
+
+    test('uses the trailing action to send content while the session is running', () => {
+        const markup = renderPill({ hasContent: true, newSessionDraftOpen: false, canAbort: true });
+
+        expect(markup).toContain('aria-label="Stop generating"');
+        expect(markup).toContain('aria-label="Send message"');
+        expect(markup).not.toContain('aria-label="New chat"');
+        expect(markup.indexOf('aria-label="Stop generating"')).toBeLessThan(markup.indexOf('aria-label="Send message"'));
+    });
+
+    test('uses the inline send action for content in a new-session draft', () => {
+        const markup = renderPill({ hasContent: true, newSessionDraftOpen: true });
+
+        expect(markup).toContain('aria-label="Send message"');
+        expect(markup).toContain('w-0 opacity-0 overflow-hidden');
+    });
+
+    test('keeps the new-session action for an empty existing session', () => {
+        const markup = renderPill({ hasContent: false, newSessionDraftOpen: false });
+
+        expect(markup).toContain('aria-label="New chat"');
+        expect(markup).not.toContain('aria-label="Send message"');
+    });
+
+    test('keeps the trailing action collapsed for an empty new-session draft', () => {
+        const markup = renderPill({ hasContent: false, newSessionDraftOpen: true });
+
+        expect(markup).toContain('w-0 opacity-0 overflow-hidden');
+        expect(markup).not.toContain('aria-label="Send message"');
+    });
+
+    test('keeps abort and new-session actions while a session runs without content', () => {
+        const markup = renderPill({ hasContent: false, newSessionDraftOpen: false, canAbort: true });
+
+        expect(markup).toContain('aria-label="Stop generating"');
+        expect(markup).toContain('aria-label="New chat"');
+        expect(markup).not.toContain('aria-label="Send message"');
+    });
+});

packages/ui/src/components/chat/composer/ui/MobilePillComposer.tsx

@@ -2,13 +2,13 @@
  * The collapsed mobile composer.
  *
  * With the keyboard down the composer is a pill: attachments, a one-line
- * preview of the draft, and a mic, with a round new-session button beside it.
+ * preview of the draft, and a mic, with a round contextual action beside it.
  * Tapping anywhere in it expands the real composer and raises the keyboard in
  * the same gesture — which is why the expand handler must run synchronously
  * from the tap rather than from an effect.
  *
- * The new-session button collapses away once a draft is already open, letting
- * the pill grow into its place.
+ * With content, the inner end slot sends while the session is idle. While it
+ * is running, abort keeps that slot and the outer new-session action sends.
  */
 
 import { Icon } from '@/components/icon/Icon';
@@ -30,10 +30,12 @@ export interface MobilePillComposerProps {
     canAbort: boolean;
     footerIconButtonClass: string;
     iconSizeClass: string;
+    sendIconSizeClass: string;
     stopIconSizeClass: string;
     theme: Theme;
     onExpand: () => void;
     onApplySuggestion: (text: string) => void;
+    onPrimaryAction: () => void;
     onNewSession: () => void;
     onPickLocalFiles: () => void;
     onOpenIssuePicker: () => void;
@@ -57,10 +59,12 @@ export function MobilePillComposer(props: MobilePillComposerProps) {
         canAbort,
         footerIconButtonClass,
         iconSizeClass,
+        sendIconSizeClass,
         stopIconSizeClass,
         theme: currentTheme,
         onExpand,
         onApplySuggestion,
+        onPrimaryAction,
         onNewSession,
         onPickLocalFiles,
         onOpenIssuePicker,
@@ -71,6 +75,8 @@ export function MobilePillComposer(props: MobilePillComposerProps) {
         onStartDictation,
         onAbort,
     } = props;
+    const canPrimaryAction = hasContent && Boolean(currentSessionId || newSessionDraftOpen);
+    const showTrailingSendAction = canPrimaryAction && canAbort;
 
     return (
         <div className="flex flex-col">
@@ -158,26 +164,42 @@ export function MobilePillComposer(props: MobilePillComposerProps) {
                     >
                         <StopIcon className={cn(stopIconSizeClass)} />
                     </button>
+                ) : canPrimaryAction ? (
+                    <button
+                        type="button"
+                        className={cn(footerIconButtonClass, 'text-primary hover:text-primary')}
+                        onClick={onPrimaryAction}
+                        title={t('chat.chatInput.actions.sendMessageAria')}
+                        aria-label={t('chat.chatInput.actions.sendMessageAria')}
+                    >
+                        <Icon name="send-plane-2" className={cn(sendIconSizeClass)} />
+                    </button>
                 ) : null}
             </div>
-            {/* New-session button: fades/shrinks away when the draft is
-                already open, letting the pill expand into its place. */}
+            {/* While running, Send moves outside because Abort owns the pill's
+                end slot. An empty new-session draft needs neither action. */}
             <div
                 className={cn(
                     'flex-shrink-0 transition-all duration-200 ease-out',
-                    newSessionDraftOpen ? 'w-0 opacity-0 overflow-hidden' : 'w-11 opacity-100',
+                    newSessionDraftOpen && !showTrailingSendAction ? 'w-0 opacity-0 overflow-hidden' : 'w-11 opacity-100',
                 )}
             >
                 <button
                     type="button"
-                    className="flex h-11 w-11 cursor-pointer items-center justify-center rounded-full border border-border/80 text-foreground shadow-[0_4px_16px_-4px_rgb(0_0_0_/_0.12)]"
+                    className={cn(
+                        'flex h-11 w-11 cursor-pointer items-center justify-center rounded-full border border-border/80 shadow-[0_4px_16px_-4px_rgb(0_0_0_/_0.12)]',
+                        showTrailingSendAction ? 'text-primary hover:text-primary' : 'text-foreground',
+                    )}
                     style={{ backgroundColor: currentTheme?.colors?.surface?.subtle }}
-                    onClick={onNewSession}
-                    disabled={newSessionDraftOpen}
-                    title={t('mobile.sessions.newChat')}
-                    aria-label={t('mobile.sessions.newChat')}
+                    onClick={showTrailingSendAction ? onPrimaryAction : onNewSession}
+                    disabled={newSessionDraftOpen && !showTrailingSendAction}
+                    title={t(showTrailingSendAction ? 'chat.chatInput.actions.sendMessageAria' : 'mobile.sessions.newChat')}
+                    aria-label={t(showTrailingSendAction ? 'chat.chatInput.actions.sendMessageAria' : 'mobile.sessions.newChat')}
                 >
-                    <Icon name="add" className="h-5 w-5 text-current" />
+                    <Icon
+                        name={showTrailingSendAction ? 'send-plane-2' : 'add'}
+                        className={cn(showTrailingSendAction ? sendIconSizeClass : 'h-5 w-5', 'text-current')}
+                    />
                 </button>
             </div>
         </div>