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/e2e/helpers/mock-agent.ts

@@ -1,7 +1,7 @@
 import type { Page } from "@playwright/test";
-import { buildHostWorkspaceRoute } from "../../src/utils/host-routes";
 import { seedWorkspace, type SeedDaemonClient } from "./seed-client";
 import { getServerId } from "./server-id";
+import { buildHostAgentDetailRoute } from "../../src/utils/host-routes";
 
 export interface MockAgentWorkspace {
   agentId: string;
@@ -54,9 +54,7 @@ export async function seedMockAgentWorkspace(
 }
 
 export function buildAgentRoute(workspaceId: string, agentId: string): string {
-  return `${buildHostWorkspaceRoute(getServerId(), workspaceId)}?open=${encodeURIComponent(
-    `agent:${agentId}`,
-  )}`;
+  return buildHostAgentDetailRoute(getServerId(), agentId, workspaceId);
 }
 
 /** Boots the app directly at the agent's workspace route and waits for the open intent to settle. */