Revert #4421 and narrow the cache restore fix (#4436)

* Revert "Restore cached conversations before reconnecting (#4421)"

This reverts commit 1c51b52d07.

* fix(app): restore provider loading on native

* fix(app): preserve native navigators across appearance changes

Reapply the isolated appearance boundaries and native menu transform origin from #4421 so appearance hydration preserves native navigator and gesture host lifetimes.

* fix(app): retain cached baselines during live updates

Read the timeline concurrently with agent preparation and reconcile display-only cache rows beneath the live head using the existing reducer. Merge cached directory entries beneath live state while preserving the existing checkpoint race guard.

packages/app/src/composer/draft/create-flow.test.ts

@@ -2,34 +2,17 @@
  * @vitest-environment jsdom
  */
 import { act, renderHook } from "@testing-library/react";
-import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { beforeEach, describe, expect, it, vi } from "vitest";
 import { useCreateFlowStore } from "@/stores/create-flow-store";
 import type { UserMessageImageAttachment } from "@/types/stream";
 import type { AgentAttachment } from "@getpaseo/protocol/messages";
 import { useDraftAgentCreateFlow, type DraftCreateAttempt } from "./create-flow";
 
-import { getHostRuntimeStore } from "@/runtime/host-runtime";
-import { defaultHostAppearance } from "@/hosts/appearance";
-
 describe("useDraftAgentCreateFlow", () => {
   beforeEach(() => {
     useCreateFlowStore.setState({ pendingByDraftId: {} });
-    getHostRuntimeStore().syncHosts([
-      {
-        serverId: "server-1",
-        label: "test",
-        appearance: defaultHostAppearance(),
-        lifecycle: {},
-        connections: [],
-        preferredConnectionId: null,
-        createdAt: new Date(0).toISOString(),
-        updatedAt: new Date(0).toISOString(),
-      },
-    ]);
   });
 
-  afterEach(() => getHostRuntimeStore().syncHosts([]));
-
   it("renders a prepared new-workspace submission before continuing it", async () => {
     const image: UserMessageImageAttachment = {
       id: "image-1",

packages/app/src/composer/draft/create-flow.ts

@@ -6,7 +6,7 @@ import {
   splitComposerAttachmentsForSubmit,
 } from "@/composer/attachments/submit";
 import { useCreateFlowStore } from "@/stores/create-flow-store";
-import { getHostRuntimeStore } from "@/runtime/host-runtime";
+import { handoffCreatedAgentMessageSubmission } from "@/composer/submission/writer";
 import { useSessionStore } from "@/stores/session-store";
 import {
   createUserMessage,
@@ -214,18 +214,17 @@ export function useDraftAgentCreateFlow<TDraftAgent, TCreateResult>({
 
         if (createResult.agentId) {
           updatePendingAgentId({ draftId, agentId: createResult.agentId });
-          getHostRuntimeStore()
-            .getTimelineReplica(pendingServerId)
-            .handoffSubmission(
-              createResult.agentId,
-              createUserMessage({
-                clientMessageId: attempt.clientMessageId,
-                text: attempt.text,
-                timestamp: attempt.timestamp,
-                images: attempt.images,
-                attachments: attempt.attachments,
-              }),
-            );
+          handoffCreatedAgentMessageSubmission(
+            pendingServerId,
+            createResult.agentId,
+            createUserMessage({
+              clientMessageId: attempt.clientMessageId,
+              text: attempt.text,
+              timestamp: attempt.timestamp,
+              images: attempt.images,
+              attachments: attempt.attachments,
+            }),
+          );
           markPendingCreateLifecycle({ draftId, lifecycle: "sent" });
         }