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/utils/host-routes.test.ts

@@ -238,6 +238,16 @@ describe("global routes", () => {
       }),
     ).toBe("/new?serverId=local&dir=%2Frepo%2Fproject&name=Project&projectId=project-1");
   });
+
+  it("buildNewWorkspaceRoute carries a draft context id", () => {
+    expect(
+      buildNewWorkspaceRoute({
+        serverId: "local",
+        sourceDirectory: "/repo/project",
+        draftId: "draft-1",
+      }),
+    ).toBe("/new?serverId=local&dir=%2Frepo%2Fproject&draftId=draft-1");
+  });
 });
 
 describe("host settings section slugs", () => {