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/stores/workspace-draft-submission-store.ts

@@ -1,6 +1,7 @@
 import { create } from "zustand";
 import type { ComposerAttachment } from "@/attachments/types";
 import type { AgentProvider } from "@getpaseo/protocol/agent-types";
+import type { WorkspaceDraftTabSetup } from "@/stores/workspace-tabs-store";
 
 export interface PendingWorkspaceDraftSubmission {
   serverId: string;
@@ -19,9 +20,21 @@ export interface PendingWorkspaceDraftSubmission {
   allowEmptyText?: boolean;
 }
 
+export interface PendingWorkspaceDraftSetup {
+  setup: WorkspaceDraftTabSetup;
+  sourceDirectory?: string | null;
+}
+
 interface WorkspaceDraftSubmissionState {
   pendingByDraftId: Record<string, PendingWorkspaceDraftSubmission>;
+  setupByDraftId: Record<string, PendingWorkspaceDraftSetup>;
   setPending: (submission: PendingWorkspaceDraftSubmission) => void;
+  setDraftSetup: (input: {
+    draftId: string;
+    setup: WorkspaceDraftTabSetup;
+    sourceDirectory?: string | null;
+  }) => void;
+  clearDraftSetup: (input: { draftId: string }) => void;
   consumePending: (input: {
     serverId: string;
     workspaceId: string;
@@ -40,9 +53,14 @@ function matchesPendingSubmission(
   );
 }
 
+function normalizeDraftId(draftId: string): string {
+  return draftId.trim();
+}
+
 export const useWorkspaceDraftSubmissionStore = create<WorkspaceDraftSubmissionState>(
   (set, get) => ({
     pendingByDraftId: {},
+    setupByDraftId: {},
     setPending: (submission) =>
       set((state) => ({
         pendingByDraftId: {
@@ -50,6 +68,25 @@ export const useWorkspaceDraftSubmissionStore = create<WorkspaceDraftSubmissionS
           [submission.draftId]: submission,
         },
       })),
+    setDraftSetup: ({ draftId, setup, sourceDirectory }) => {
+      const normalizedDraftId = normalizeDraftId(draftId);
+      if (!normalizedDraftId) return;
+      set((state) => ({
+        setupByDraftId: {
+          ...state.setupByDraftId,
+          [normalizedDraftId]: { setup, sourceDirectory: sourceDirectory ?? null },
+        },
+      }));
+    },
+    clearDraftSetup: ({ draftId }) => {
+      const normalizedDraftId = normalizeDraftId(draftId);
+      if (!normalizedDraftId) return;
+      set((state) => {
+        if (!state.setupByDraftId[normalizedDraftId]) return state;
+        const { [normalizedDraftId]: _removed, ...setupByDraftId } = state.setupByDraftId;
+        return { setupByDraftId };
+      });
+    },
     consumePending: (input) => {
       const pending = get().pendingByDraftId[input.draftId];
       if (!matchesPendingSubmission(pending, input)) {