feat: add workspace files to chat from Files and Changes

* feat(app): open changed files from context menu

* fix(app): preserve changed-file row behavior

* feat(app): add changed files to open chats

* feat(app): share file actions across explorer and changes

* feat(app): attach workspace files to focused chat

* feat(app): drag workspace files into chat

* refactor(app): use file actions menu for changed files

* fix(app): open changed-file actions on right click

* test(app): cover direct file attachment flow

* fix(app): enable add to chat on native

* fix(app): align workspace file pane rows

* refactor(app): simplify workspace file attachments

* fix(app): preserve uploaded file draft attachments

---------

Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/app/src/composer/index.tsx

@@ -99,6 +99,7 @@ import type {
   AttachmentMetadata,
   ComposerAttachment,
   UserComposerAttachment,
+  WorkspaceFileComposerAttachment,
   WorkspaceComposerAttachment,
 } from "@/attachments/types";
 import type { PickedFile } from "@/attachments/picked-file";
@@ -119,6 +120,15 @@ import { getForgePresentation } from "@/git/forge";
 import { ForgeBrandIcon } from "@/git/forge-icon";
 import { useComposerGithubAutoAttach } from "./github/auto-attach";
 import { resolveClientSlashCommand, type ClientSlashCommand } from "@/client-slash-commands";
+import {
+  appendWorkspaceFileAttachment,
+  getWorkspaceFileAttachmentKey,
+  getWorkspaceFileAttachmentSubtitle,
+} from "@/attachments/workspace-file";
+import {
+  resolveWorkspaceFileDrop,
+  type WorkspaceFileDragPayload,
+} from "@/attachments/workspace-file-drag";
 
 type QueuedMessage = QueuedComposerMessage;
 
@@ -399,6 +409,18 @@ function renderComposerAttachmentPill(args: RenderComposerAttachmentPillArgs): R
       />
     );
   }
+  if (attachment.kind === "workspace_file") {
+    return (
+      <WorkspaceFileAttachmentPill
+        key={`workspace-file:${getWorkspaceFileAttachmentKey(attachment)}`}
+        attachment={attachment}
+        index={index}
+        disabled={disabled}
+        onRemove={onRemove}
+        removeLabel={labels.removeFile}
+      />
+    );
+  }
   if (composerWorkspaceAttachment.is(attachment)) {
     return composerWorkspaceAttachment.renderPill({
       attachment,
@@ -711,6 +733,43 @@ function FileAttachmentPill({
   );
 }
 
+interface WorkspaceFileAttachmentPillProps {
+  attachment: WorkspaceFileComposerAttachment;
+  index: number;
+  disabled: boolean;
+  onRemove: (index: number) => void;
+  removeLabel: string;
+}
+
+function WorkspaceFileAttachmentPill({
+  attachment,
+  index,
+  disabled,
+  onRemove,
+  removeLabel,
+}: WorkspaceFileAttachmentPillProps) {
+  const handleRemove = useCallback(() => {
+    onRemove(index);
+  }, [index, onRemove]);
+  const fileName = attachment.path.split("/").pop() ?? attachment.path;
+  return (
+    <AttachmentPill
+      testID="composer-workspace-file-attachment-pill"
+      onOpen={noopCallback}
+      onRemove={handleRemove}
+      openAccessibilityLabel={fileName}
+      removeAccessibilityLabel={removeLabel}
+      disabled={disabled}
+    >
+      <AttachmentLabel
+        icon={filePillIcon}
+        title={fileName}
+        subtitle={getWorkspaceFileAttachmentSubtitle(attachment)}
+      />
+    </AttachmentPill>
+  );
+}
+
 interface GithubPickerOptionProps {
   label: string;
   testID: string;
@@ -755,6 +814,7 @@ function GithubPickerOption({
 interface ComposerProps {
   agentId: string;
   serverId: string;
+  workspaceId?: string | null;
   isPaneFocused: boolean;
   onSubmitMessage?: (payload: MessagePayload) => Promise<void>;
   onClientSlashCommand?: (command: ClientSlashCommand) => Promise<void>;
@@ -786,6 +846,8 @@ interface ComposerProps {
   clearDraft: (lifecycle: "sent" | "abandoned") => void;
   /** When true, auto-focuses the text input on web. */
   autoFocus?: boolean;
+  /** Changing this value requests focus again while autoFocus remains true. */
+  autoFocusKey?: string;
   /** Callback to expose a focus function to parent components (desktop only). */
   onFocusInput?: (focus: () => void) => void;
   /** Optional draft context for listing commands before an agent exists. */
@@ -977,6 +1039,7 @@ function ComposerVoiceModeButton({
 export function Composer({
   agentId,
   serverId,
+  workspaceId,
   isPaneFocused,
   onSubmitMessage,
   onClientSlashCommand,
@@ -1000,6 +1063,7 @@ export function Composer({
   cwd,
   clearDraft,
   autoFocus = false,
+  autoFocusKey,
   onFocusInput,
   commandDraftConfig,
   onMessageSent,
@@ -1195,6 +1259,21 @@ export function Composer({
     });
   }, []);
 
+  const handleWorkspaceFileDropped = useCallback(
+    (payload: WorkspaceFileDragPayload) => {
+      if (!workspaceId) {
+        return;
+      }
+      const attachment = resolveWorkspaceFileDrop({ payload, serverId, workspaceId });
+      if (!attachment) {
+        return;
+      }
+      setSelectedAttachments((current) => appendWorkspaceFileAttachment(current, attachment));
+      focusInput();
+    },
+    [focusInput, serverId, setSelectedAttachments, workspaceId],
+  );
+
   useEffect(() => {
     onFocusInput?.(focusInput);
   }, [focusInput, onFocusInput]);
@@ -1969,7 +2048,11 @@ export function Composer({
   // so a drop in that window would be lost or land on a locked draft. `disabled` hides the
   // backdrop and rejects the drop atomically, instead of accepting a drop with no feedback.
   useFileDrop(
-    { onFiles: addImages, onGenericFiles: handleGenericFilesDropped },
+    {
+      onFiles: addImages,
+      onGenericFiles: handleGenericFilesDropped,
+      onWorkspaceFile: handleWorkspaceFileDropped,
+    },
     { disabled: isSubmitBusy },
   );
 
@@ -2030,7 +2113,7 @@ export function Composer({
                 isReadyForDictation={isDictationReady}
                 placeholder={messagePlaceholder}
                 autoFocus={messageInputAutoFocus}
-                autoFocusKey={`${serverId}:${agentId}`}
+                autoFocusKey={`${serverId}:${agentId}:${autoFocusKey ?? ""}`}
                 disabled={isSubmitLoading}
                 isPaneFocused={isPaneFocused}
                 leftContent={leftContent}