Fork assistant turns into new drafts (#1788)

* feat(chat): fork assistant turns into new drafts

Builds chat-history attachments on the daemon and routes them into draft composers so users can continue an assistant turn in an existing workspace tab or New Workspace.

* fix(chat): clean up fork draft handling

* fix(chat): address fork draft review feedback

* fix(server): build fork context from bounded timeline

* fix(app): restore assistant turn footer in streams

* fix(app): preserve fork draft setup

* fix(app): tighten assistant fork footers

* fix(app): lock active fork draft handoff

* fix(app): preserve attachment-only draft retries

* fix(app): unify composer attachment scopes

* fix(app): align chat history attachment labels

* fix(app): centralize attachment pill content

* fix(app): trim fork context for workspace naming

packages/app/src/composer/draft/workspace-tab.tsx

@@ -27,14 +27,18 @@ import { useWorkspaceDraftSubmissionStore } from "@/stores/workspace-draft-submi
 import { encodeImages } from "@/utils/encode-images";
 import type { WorkspaceFileOpenRequest } from "@/workspace/file-open";
 import { shouldAutoFocusWorkspaceDraftComposer } from "@/screens/workspace/workspace-draft-pane-focus";
-import { validateDraftSubmission } from "@/composer/draft/workspace-tab-core";
+import {
+  shouldAllowEmptyDraftText,
+  validateDraftSubmission,
+} from "@/composer/draft/workspace-tab-core";
 import type { AgentCapabilityFlags } from "@getpaseo/protocol/agent-types";
 import type { AgentSnapshotPayload } from "@getpaseo/protocol/messages";
 import type { DaemonClient } from "@getpaseo/client/internal/daemon-client";
 import type { WorkspaceComposerAttachment } from "@/attachments/types";
 import {
-  useWorkspaceAttachments,
+  useDraftWorkspaceAttachmentScopeKey,
   useWorkspaceAttachmentScopeKey,
+  useWorkspaceAttachmentsStore,
 } from "@/attachments/workspace-attachments-store";
 import type { UserMessageImageAttachment } from "@/types/stream";
 import {
@@ -118,6 +122,7 @@ async function submitDraftCreateRequest(input: {
   text: string;
   images?: UserMessageImageAttachment[];
   attachments?: unknown;
+  cwd: string;
   client: DaemonClient | null;
   workspaceDirectory: string | null;
   workspaceId: string | null;
@@ -138,6 +143,7 @@ async function submitDraftCreateRequest(input: {
     text,
     images,
     attachments,
+    cwd,
     client,
     workspaceDirectory,
     workspaceId,
@@ -162,7 +168,7 @@ async function submitDraftCreateRequest(input: {
   });
   const config = buildWorkspaceDraftAgentConfig({
     provider,
-    cwd: workspaceDirectory,
+    cwd,
     ...modeIdOverride,
     model: autoSubmitConfig?.model ?? (composerState.effectiveModelId || undefined),
     thinkingOptionId:
@@ -400,7 +406,14 @@ export function WorkspaceDraftAgentTab({
     cwd: composerState.workingDir,
     workspaceId,
   });
-  const workspaceAttachments = useWorkspaceAttachments(workspaceAttachmentScopeKey);
+  const draftAttachmentScopeKey = useDraftWorkspaceAttachmentScopeKey(draftId);
+  const attachmentScopeKeys = useMemo(
+    () => [draftAttachmentScopeKey, workspaceAttachmentScopeKey].filter(Boolean),
+    [draftAttachmentScopeKey, workspaceAttachmentScopeKey],
+  );
+  const clearWorkspaceAttachments = useWorkspaceAttachmentsStore(
+    (state) => state.clearWorkspaceAttachments,
+  );
   const openFileExplorerForCheckout = usePanelStore((state) => state.openFileExplorerForCheckout);
   const setExplorerTabForCheckout = usePanelStore((state) => state.setExplorerTabForCheckout);
   const handleOpenWorkspaceAttachment = useCallback(
@@ -437,15 +450,20 @@ export function WorkspaceDraftAgentTab({
     getPendingServerId: () => serverId,
     initialAttempt: initialCreateAttempt,
     allowEmptyText: allowsEmptyAutoSubmit,
-    validateBeforeSubmit: ({ text }) =>
-      validateDraftSubmission({
-        text,
+    validateBeforeSubmit: ({ text, attachments }) => {
+      const allowsEmptyDraftText = shouldAllowEmptyDraftText({
         allowsEmptyAutoSubmit,
+        attachments,
+      });
+      return validateDraftSubmission({
+        text,
+        allowsEmptyAutoSubmit: allowsEmptyDraftText,
         composerState,
         autoSubmitConfig,
         workspaceDirectory: draftWorkingDirectory,
         hasClient: Boolean(client),
-      }),
+      });
+    },
     onBeforeSubmit: async () => {
       await composerState.persistFormPreferences();
       if (isWeb) {
@@ -463,12 +481,13 @@ export function WorkspaceDraftAgentTab({
         composerState,
         selectModelMessage: t("workspaceSetup.errors.selectModel"),
       }),
-    createRequest: async ({ attempt, text, images, attachments }) =>
+    createRequest: async ({ attempt, text, images, attachments, cwd }) =>
       submitDraftCreateRequest({
         attempt,
         text,
         images,
         attachments,
+        cwd,
         client,
         workspaceDirectory: draftWorkingDirectory,
         workspaceId: workspaceFields?.id ?? null,
@@ -479,6 +498,8 @@ export function WorkspaceDraftAgentTab({
       }),
     onCreateSuccess: ({ result }) => {
       clearDraftInput("sent");
+      clearWorkspaceAttachments({ scopeKey: draftAttachmentScopeKey });
+      useWorkspaceDraftSubmissionStore.getState().clearDraftSetup({ draftId });
       onCreated(result);
     },
   });
@@ -690,7 +711,7 @@ export function WorkspaceDraftAgentTab({
           value={draftInput.text}
           onChangeText={draftInput.setText}
           attachments={draftInput.attachments}
-          workspaceAttachments={workspaceAttachments}
+          attachmentScopeKeys={attachmentScopeKeys}
           onOpenWorkspaceAttachment={handleOpenWorkspaceAttachment}
           onChangeAttachments={draftInput.setAttachments}
           cwd={composerState.workingDir}