fix(agent): 输入草稿按会话保留,切换会话、关抽屉不丢

会话面板与新对话输入框的草稿原来是组件内状态,切到别的会话或 Esc 关抽屉就没了。
改为按会话(以及列表页 / 抽屉两处新对话)分键记在模块里,发送成功后清掉。

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cxwgnn2pbzQ7rXv3rq7fei

apps/web/app/components/agent/agent-nav.test.ts

@@ -2,7 +2,18 @@ import { createElement } from "react";
 import { renderToStaticMarkup } from "react-dom/server";
 import { describe, expect, it } from "vitest";
 import { runGroup } from "~/api/agent.ts";
-import { agentListHref, agentRunHref, groupFromSearch, resolveGroup, revealScrollTop } from "./agent-nav.ts";
+import {
+  agentListHref,
+  agentRunHref,
+  DRAFT_DRAWER_GOAL,
+  DRAFT_PAGE_GOAL,
+  groupFromSearch,
+  readDraft,
+  resolveGroup,
+  revealScrollTop,
+  runDraftKey,
+  writeDraft,
+} from "./agent-nav.ts";
 import { CompactPager } from "./agent-session-list.tsx";
 import { isAgentPage, outletKey } from "./agent-store.ts";
 
@@ -84,3 +95,27 @@ describe("会话列表分页(窄列表一行)", () => {
     expect(html).toContain("1 / 1+");
   });
 });
+
+describe("输入草稿", () => {
+  it("按会话分开记,切走再回来还在,不串到别的会话", () => {
+    writeDraft(runDraftKey("a"), "A 的草稿");
+    writeDraft(runDraftKey("b"), "B 的草稿");
+    expect(readDraft(runDraftKey("a"))).toBe("A 的草稿");
+    expect(readDraft(runDraftKey("b"))).toBe("B 的草稿");
+    expect(readDraft(runDraftKey("c"))).toBe("");
+  });
+  it("清空(发送成功)后不再恢复;只有空白也算清空", () => {
+    writeDraft(runDraftKey("a"), "");
+    writeDraft(runDraftKey("b"), "  ");
+    expect(readDraft(runDraftKey("a"))).toBe("");
+    expect(readDraft(runDraftKey("b"))).toBe("");
+  });
+  it("列表页与抽屉的新对话输入框各记各的;没有键时不记", () => {
+    writeDraft(DRAFT_PAGE_GOAL, "页面里写了一半");
+    writeDraft(DRAFT_DRAWER_GOAL, "抽屉里写了一半");
+    writeDraft(undefined, "不记");
+    expect(readDraft(DRAFT_PAGE_GOAL)).toBe("页面里写了一半");
+    expect(readDraft(DRAFT_DRAWER_GOAL)).toBe("抽屉里写了一半");
+    expect(readDraft(undefined)).toBe("");
+  });
+});