fix(channelbridge): IM 发送过滤 action/narration + <p>拆多气泡 + 0.5-2s 间隔

把回复转发给 IM 适配器(sendReply)时剥掉 <action>/<narration> 动作/内心独白(Web 端
才渲染灰斜体，IM 只能收纯文本)，并按 <p> 段落拆成多条气泡分别发送；多气泡发送间隔
随机 0.5~2s(仅 IM，Web 前端不延迟)。新增 sanitize.go stripNarration/splitBubbles/
bubbleGap + 测试。

frontend/web/src/admin/modules/channels/useChannelActions.ts

@@ -0,0 +1,58 @@
+import { useCallback, useState } from "react";
+import {
+  adminChannelOpen,
+  adminChannelClose,
+  adminDeleteChannelAccount,
+} from "../../../lib/api";
+import { useAuditStore } from "../../audit";
+
+/** Shared connect/disconnect/delete actions + busy/error/notice state, reused by
+ *  the list page and each adapter detail page. `reload` re-fetches the channel
+ *  list after a mutation. */
+export function useChannelActions(reload: () => void) {
+  const log = useAuditStore((s) => s.log);
+  const [busy, setBusy] = useState<string | null>(null);
+  const [error, setError] = useState<string | null>(null);
+  const [notice, setNotice] = useState<string | null>(null);
+
+  const toggle = useCallback(
+    (name: string, connect: boolean) => {
+      setBusy(name);
+      setError(null);
+      const call = connect ? adminChannelOpen(name) : adminChannelClose(name);
+      call
+        .then(() => {
+          log(connect ? "channel.open" : "channel.close", "ok");
+          reload();
+        })
+        .catch((e: unknown) => {
+          log(connect ? "channel.open" : "channel.close", "error");
+          setError(e instanceof Error ? e.message : `${connect ? "连接" : "断开"}失败`);
+        })
+        .finally(() => setBusy(null));
+    },
+    [reload, log],
+  );
+
+  const del = useCallback(
+    (platform: string, id: string) => {
+      setBusy("__del__" + id);
+      setError(null);
+      setNotice(null);
+      adminDeleteChannelAccount(platform, id)
+        .then(() => {
+          log("channel.delete", "ok");
+          setNotice(`已删除账号 ${id} 并热更新 ${platform}`);
+          reload();
+        })
+        .catch((e: unknown) => {
+          log("channel.delete", "error");
+          setError(e instanceof Error ? e.message : "删除渠道账号失败");
+        })
+        .finally(() => setBusy(null));
+    },
+    [reload, log],
+  );
+
+  return { busy, setBusy, error, setError, notice, setNotice, toggle, del };
+}