feat: preview pending image attachments

Open pasted images before sending
Reuse the existing image preview dialog
Support keyboard preview for attachment thumbnails

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

@@ -16,6 +16,8 @@ import { useSnippetsStore } from '@/stores/useSnippetsStore';
 import { appendInlineComments } from '@/lib/messages/inlineComments';
 import { renderMagicPrompt } from '@/lib/magicPrompts';
 import { AttachedFilesList, AttachedVSCodeFileChips, ActiveEditorFileSuggestion } from './FileAttachment';
+import ToolOutputDialog from './message/ToolOutputDialog';
+import type { ToolPopupContent } from './message/types';
 import { QueuedMessageChips } from './QueuedMessageChips';
 import { FileMentionAutocomplete, type FileMentionHandle } from './FileMentionAutocomplete';
 import { CommandAutocomplete, type CommandAutocompleteHandle, type CommandInfo } from './CommandAutocomplete';
@@ -990,6 +992,7 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
     const getVisibleAgents = useConfigStore((state) => state.getVisibleAgents);
     const agents = getVisibleAgents();
     const isMobile = useUIStore((state) => state.isMobile);
+    const setImagePreviewOpen = useUIStore((state) => state.setImagePreviewOpen);
     const inputBarOffset = useUIStore((state) => state.inputBarOffset);
     const persistChatDraft = useUIStore((state) => state.persistChatDraft);
     const inputSpellcheckEnabled = useUIStore((state) => state.inputSpellcheckEnabled);
@@ -1011,6 +1014,22 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
     const setSessionAutoAccept = usePermissionStore((state) => state.setSessionAutoAccept);
     const composerHighlightRef = React.useRef<HTMLDivElement | null>(null);
     const [isNarrowComposer, setIsNarrowComposer] = React.useState(false);
+    const [attachmentPreview, setAttachmentPreview] = React.useState<ToolPopupContent>({
+        open: false,
+        title: '',
+        content: '',
+    });
+
+    const handleShowAttachmentPreview = React.useCallback((content: ToolPopupContent) => {
+        if (!content.image) return;
+        setAttachmentPreview(content);
+        setImagePreviewOpen(true);
+    }, [setImagePreviewOpen]);
+
+    const handleAttachmentPreviewOpenChange = React.useCallback((open: boolean) => {
+        setAttachmentPreview((prev) => ({ ...prev, open }));
+        setImagePreviewOpen(open);
+    }, [setImagePreviewOpen]);
 
     const isDesktopExpanded = isExpandedInput && !isMobile;
     const chatInputRadius = 'var(--radius-xl)';
@@ -3787,7 +3806,7 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
             style={isMobile && inputBarOffset > 0 ? { marginBottom: `${inputBarOffset}px` } : undefined}
         >
             <div className={cn('chat-input-column relative overflow-visible', isDesktopExpanded && 'flex flex-1 min-h-0 flex-col')}>
-                <AttachedFilesList />
+                <AttachedFilesList onShowPopup={handleShowAttachmentPreview} />
                 <QueuedMessageChips
                     onEditMessage={handleQueuedMessageEdit}
                 />
@@ -4167,7 +4186,7 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
                     )}
                     <div className={cn("overflow-hidden", isDesktopExpanded && 'flex flex-1 min-h-0 flex-col')}>
                         <div className="flex items-center gap-1 px-3 pt-1 flex-wrap relative z-10">
-                            <AttachedVSCodeFileChips />
+                            <AttachedVSCodeFileChips onShowPopup={handleShowAttachmentPreview} />
                             <ActiveEditorFileSuggestion />
                         </div>
                         <div className={cn("relative overflow-hidden", isDesktopExpanded && 'flex flex-1 min-h-0 flex-col')}>
@@ -4403,6 +4422,12 @@ const ChatInputComponent: React.FC<ChatInputProps> = ({ onOpenSettings, scrollTo
                 setLinkedIssue(null);
             }}
         />
+        <ToolOutputDialog
+            popup={attachmentPreview}
+            onOpenChange={handleAttachmentPreviewOpenChange}
+            syntaxTheme={{}}
+            isMobile={isMobile}
+        />
         </>
     );
 };

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

@@ -124,9 +124,12 @@ FileAttachmentButton.displayName = 'FileAttachmentButton';
 interface ImagePreviewProps {
   file: AttachedFile;
   onRemove: () => void;
+  onShowPopup?: (content: ToolPopupContent) => void;
+  gallery?: NonNullable<ToolPopupContent['image']>['gallery'];
+  index?: number;
 }
 
-const ImagePreview = memo(({ file, onRemove }: ImagePreviewProps) => {
+const ImagePreview = memo(({ file, onRemove, onShowPopup, gallery, index = 0 }: ImagePreviewProps) => {
   const { t } = useI18n();
   const { isMobile, isTablet } = useDeviceInfo();
   const alwaysShowActions = isMobile || isTablet;
@@ -151,6 +154,29 @@ const ImagePreview = memo(({ file, onRemove }: ImagePreviewProps) => {
 
   const displayName = extractFilename(file.filename);
   const extension = getFileExtension(file.filename);
+  const handleOpenPreview = React.useCallback(() => {
+    if (!onShowPopup || !imageUrl) return;
+
+    onShowPopup({
+      open: true,
+      title: displayName || 'Image',
+      content: '',
+      metadata: {
+        tool: 'image-preview',
+        filename: displayName,
+        mime: file.mimeType,
+        size: file.size,
+      },
+      image: {
+        url: imageUrl,
+        mimeType: file.mimeType,
+        filename: displayName,
+        size: file.size,
+        gallery,
+        index,
+      },
+    });
+  }, [displayName, file.mimeType, file.size, gallery, imageUrl, index, onShowPopup]);
 
   if (!imageUrl) {
     // Fallback to text-only for server images without preview
@@ -178,7 +204,20 @@ const ImagePreview = memo(({ file, onRemove }: ImagePreviewProps) => {
   }
 
   return (
-    <div className="relative h-10 w-10 rounded-lg border border-border/40 bg-muted/10 overflow-hidden flex-shrink-0 group">
+    <div
+      role={onShowPopup ? 'button' : undefined}
+      tabIndex={onShowPopup ? 0 : undefined}
+      onClick={handleOpenPreview}
+      onKeyDown={(event) => {
+        if (!onShowPopup) return;
+        if (event.key === 'Enter' || event.key === ' ') {
+          event.preventDefault();
+          handleOpenPreview();
+        }
+      }}
+      className="relative h-10 w-10 rounded-lg border border-border/40 bg-muted/10 overflow-hidden flex-shrink-0 group cursor-pointer focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary"
+      aria-label={displayName}
+    >
       <img
         src={imageUrl}
         alt={displayName}
@@ -186,7 +225,10 @@ const ImagePreview = memo(({ file, onRemove }: ImagePreviewProps) => {
         loading="lazy"
       />
       <button
-        onClick={onRemove}
+        onClick={(event) => {
+          event.stopPropagation();
+          onRemove();
+        }}
         className={cn(
           "absolute top-0.5 right-0.5 h-4 w-4 rounded-full bg-background/80 text-foreground hover:text-destructive flex items-center justify-center transition-opacity focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring",
           alwaysShowActions ? "opacity-100" : "opacity-0 group-hover:opacity-100"
@@ -313,7 +355,11 @@ const VSCodeFileChip = memo(({ file, onRemove }: FileChipProps) => {
 
 VSCodeFileChip.displayName = 'VSCodeFileChip';
 
-export const AttachedVSCodeFileChips = memo(() => {  
+interface AttachedFilesListProps {
+  onShowPopup?: (content: ToolPopupContent) => void;
+}
+
+export const AttachedVSCodeFileChips = memo(({ onShowPopup }: AttachedFilesListProps) => {  
   const attachedFiles = useInputStore((state) => state.attachedFiles);
   const removeAttachedFile = useInputStore((state) => state.removeAttachedFile);
 
@@ -323,11 +369,17 @@ export const AttachedVSCodeFileChips = memo(() => {
 
   const images = vscodeFiles.filter((f) => f.mimeType.startsWith('image/'));
   const otherFiles = vscodeFiles.filter((f) => !f.mimeType.startsWith('image/'));
+  const imageGallery = images.map((file) => ({
+    url: file.dataUrl || file.serverPath || '',
+    mimeType: file.mimeType,
+    filename: file.filename,
+    size: file.size,
+  })).filter((image) => image.url);
 
   return (
     <div className="flex items-center gap-2 flex-wrap">
-      {images.map((file) => (
+      {images.map((file, index) => (
-        <ImagePreview key={file.id} file={file} onRemove={() => removeAttachedFile(file.id)} />
+        <ImagePreview key={file.id} file={file} onRemove={() => removeAttachedFile(file.id)} onShowPopup={onShowPopup} gallery={imageGallery} index={index} />
       ))}
       {otherFiles.map((file) => (
         <VSCodeFileChip key={file.id} file={file} onRemove={() => removeAttachedFile(file.id)} />
@@ -338,7 +390,7 @@ export const AttachedVSCodeFileChips = memo(() => {
 
 AttachedVSCodeFileChips.displayName = 'AttachedVSCodeFileChips';
 
-export const AttachedFilesList = memo(() => {
+export const AttachedFilesList = memo(({ onShowPopup }: AttachedFilesListProps) => {
   const attachedFiles = useInputStore((state) => state.attachedFiles);
   const removeAttachedFile = useInputStore((state) => state.removeAttachedFile);
 
@@ -348,17 +400,26 @@ export const AttachedFilesList = memo(() => {
 
   const images = localFiles.filter((f) => f.mimeType.startsWith('image/'));
   const otherFiles = localFiles.filter((f) => !f.mimeType.startsWith('image/'));
+  const imageGallery = images.map((file) => ({
+    url: file.dataUrl || file.serverPath || '',
+    mimeType: file.mimeType,
+    filename: file.filename,
+    size: file.size,
+  })).filter((image) => image.url);
 
   return (
     <div className="pb-4 w-full px-1 space-y-3">
       {/* Images row - inline with previews */}
       {images.length > 0 && (
         <div className="flex items-center gap-1.5 flex-wrap">
-          {images.map((file) => (
+          {images.map((file, index) => (
             <ImagePreview
               key={file.id}
               file={file}
               onRemove={() => removeAttachedFile(file.id)}
+              onShowPopup={onShowPopup}
+              gallery={imageGallery}
+              index={index}
             />
           ))}
         </div>