diff --git a/web/src/features/messages/ChatListColumn.tsx b/web/src/features/messages/ChatListColumn.tsx
index 5832cafe..7269881b 100644
--- a/web/src/features/messages/ChatListColumn.tsx
+++ b/web/src/features/messages/ChatListColumn.tsx
@@ -8,6 +8,7 @@ import { CreateGroupModal } from '@/features/groups/CreateGroupModal';
 import { fetchAllPages } from '@/lib/api/client';
 import { getGroups } from '@/lib/api/groups';
 import { useBootstrap } from '@/lib/api/hooks';
+import { getMe } from '@/lib/api/profile';
 import { avatarBgClass, avatarLetter } from '@/lib/avatar';
 import { formatMessagePreview } from '@/lib/messages/preview';
 import { formatListTime } from '@/lib/messages/time';
@@ -55,6 +56,9 @@ export function ChatListColumn() {
   const location = useLocation();
   const navigate = useNavigate();
   const myUserId = useSessionStore((s) => s.myUserId);
+  // `slf` (chat with yourself) never has its own `.public.fn` -- shares AppShell's `['me']` query
+  // key so this is a cache read, not an extra request, in the common case that already mounted it.
+  const meQuery = useQuery({ queryKey: ['me'], queryFn: getMe });
   const tinode = useTinode();
   const contacts = useChatList();
   const bootstrap = useBootstrap();
@@ -70,7 +74,13 @@ export function ChatListColumn() {
     return pinDelta || (b.touched?.getTime() ?? 0) - (a.touched?.getTime() ?? 0);
   });
   const trimmedQuery = query.trim();
-  const filtered = trimmedQuery ? sorted.filter((c) => (c.public?.fn || c.topic || '').toLowerCase().includes(trimmedQuery.toLowerCase())) : sorted;
+  const filtered = trimmedQuery
+    ? sorted.filter((c) =>
+        (c.topic === 'slf' ? meQuery.data?.profile.nickname || '我' : c.public?.fn || c.topic || '')
+          .toLowerCase()
+          .includes(trimmedQuery.toLowerCase()),
+      )
+    : sorted;
   const pinned = PINNED_ENTRIES.filter((entry) => bootstrap.data?.entries?.[entry.key]?.enabled);
 
   return (
@@ -127,7 +137,7 @@ export function ChatListColumn() {
           </div>
         ) : (
           filtered.map((contact) => {
-            const name = contact.public?.fn || contact.topic;
+            const name = contact.topic === 'slf' ? meQuery.data?.profile.nickname || '我' : contact.public?.fn || contact.topic;
             const preview = formatMessagePreview(contact.latestMessage?.(), myUserId);
             const active = topicId === contact.topic;
             const isGroup = tinode.getTopic(contact.topic).isGroupType();
diff --git a/web/src/features/messages/ConversationView.tsx b/web/src/features/messages/ConversationView.tsx
index 63e6da33..d5242f8c 100644
--- a/web/src/features/messages/ConversationView.tsx
+++ b/web/src/features/messages/ConversationView.tsx
@@ -18,6 +18,7 @@ import { JoinRequestsModal } from '@/features/groups/JoinRequestsModal';
 import { useBootstrap } from '@/lib/api/hooks';
 import { favoriteMessages, type MediaType, recallMessage } from '@/lib/api/messages';
 import { getAllGroupMembers, getGroup, getGroupGovernance, getGroupMutes, getGroupSummary } from '@/lib/api/groups';
+import { getMe } from '@/lib/api/profile';
 import { avatarBgClass, avatarLetter } from '@/lib/avatar';
 import { FETCH_PAGE_TRIGGER, MESSAGES_PAGE } from '@/lib/config';
 import { useClickOutside } from '@/lib/hooks';
@@ -237,6 +238,12 @@ export function ConversationView() {
   // queries it gates can sit before the `if (!topicId)` early return, alongside every other hook --
   // `tinode.getTopic()` is a cheap cache lookup-or-create either way, calling it twice is harmless.
   const isGroup = !!topicId && tinode.getTopic(topicId).isGroupType();
+  // `slf` (chatting with yourself, née "文件助手" -- see ChatListColumn.tsx's PINNED_ENTRIES
+  // comment on why that framing was deliberately dropped) isn't in your own contacts/friends list,
+  // so `contact` below is always undefined for it -- shares AppShell's/SettingsLayout's `['me']`
+  // query so this doesn't add a request beyond whichever of those mounts first.
+  const isSelf = topicId === 'slf';
+  const meQuery = useQuery({ queryKey: ['me'], queryFn: getMe, enabled: isSelf });
   const membersQuery = useQuery({
     queryKey: ['group-members', topicId],
     queryFn: () => getAllGroupMembers(topicId || ''),
@@ -272,7 +279,7 @@ export function ConversationView() {
 
   if (!topicId) return null;
   const topic = tinode.getTopic(topicId);
-  const peerName = contact?.public?.fn || topicId;
+  const peerName = isSelf ? meQuery.data?.profile.nickname || '我' : contact?.public?.fn || topicId;
   const groupMemberCount = groupProfileQuery.data?.member_count ?? membersQuery.data?.length ?? 0;
   // `peerName` is the GROUP's own name for a group topic, not any member's -- reusing it to label
   // "who is being quoted" (as both the reply-composer preview and the actual sent quote block used
@@ -335,17 +342,28 @@ export function ConversationView() {
     if (!text) return;
     setDraft('');
     setMentionTrigger(null);
-    if (replyTo) {
-      // Mentions inside a reply don't get spliced into real MN entities -- a quoted reply that also
-      // pings someone is a rare enough compound case that it isn't worth a second stitching path;
-      // the "@name" text still sends fine, just without the entity/highlight.
-      sendReply(topic, text, replyTo, quotedSenderLabel(replyTo.from)).catch((err) => showError(err, '发送失败'));
-      setReplyTo(null);
-    } else if (pendingMentions.length > 0) {
-      sendPrebuiltContent(topic, buildMentionedContent(text, pendingMentions)).catch((err) => showError(err, '发送失败'));
-    } else {
-      sendText(topic, text).catch((err) => showError(err, '发送失败'));
-    }
+    const pendingReplyTo = replyTo;
+    setReplyTo(null);
+    // The composer's own topic can be detached by the time this actually fires -- e.g. a
+    // disconnect/reconnect cycle resets every topic's attached state (see connection.ts's
+    // onReauthenticated), and publishing on a detached topic is rejected outright by the SDK. The
+    // forward flow above already guards against exactly this (see ensureTopicAttached's own
+    // comment for why it's the common case, not an edge case); the primary composer -- used far
+    // more often than forwarding -- had no equivalent guard at all.
+    ensureTopicAttached(topicId)
+      .then((target) => {
+        if (pendingReplyTo) {
+          // Mentions inside a reply don't get spliced into real MN entities -- a quoted reply that
+          // also pings someone is a rare enough compound case that it isn't worth a second
+          // stitching path; the "@name" text still sends fine, just without the entity/highlight.
+          return sendReply(target, text, pendingReplyTo, quotedSenderLabel(pendingReplyTo.from));
+        }
+        if (pendingMentions.length > 0) {
+          return sendPrebuiltContent(target, buildMentionedContent(text, pendingMentions));
+        }
+        return sendText(target, text);
+      })
+      .catch((err) => showError(err, '发送失败'));
     if (topicId) setMentionsByTopic((prev) => ({ ...prev, [topicId]: [] }));
   };
 
@@ -574,7 +592,7 @@ export function ConversationView() {
                   </strong>
                   {isGroup ? (
                     groupSublineParts.length ? <span className="text-xs text-text-tertiary-2">{groupSublineParts.join(' · ')}</span> : null
-                  ) : (
+                  ) : isSelf ? null : (
                     <span className={`text-xs ${contact?.online ? 'text-online' : 'text-text-tertiary-2'}`}>
                       {contact?.online ? '在线' : '离线'}
                     </span>
@@ -583,7 +601,7 @@ export function ConversationView() {
               </button>
             </div>
             <div className="flex items-center gap-1">
-              {isGroup ? null : (
+              {isGroup || isSelf ? null : (
                 <>
                   <button
                     type="button"
diff --git a/web/src/features/messages/MessageBubble.tsx b/web/src/features/messages/MessageBubble.tsx
index c4a1f195..1d18c2e6 100644
--- a/web/src/features/messages/MessageBubble.tsx
+++ b/web/src/features/messages/MessageBubble.tsx
@@ -11,6 +11,7 @@ import { renderDrafty } from '@/lib/messages/drafty';
 import { formatBubbleTime, formatEventTimestamp } from '@/lib/messages/time';
 import { isFailedStatus, isSendingStatus, outgoingStatusLabel } from '@/lib/messages/status';
 import { retryMessage } from '@/lib/tinode/send';
+import { ensureTopicAttached } from '@/lib/tinode/topics';
 
 /** 设计稿 4.3：气泡上方角色标签，边框样式（不是填色）-- 群主 #ff951c、管理员 #1677ff，均不加背景。
  *  与 GroupMembersModal/GroupDetailColumn 里另外两种角色标签（填色 tag、圆角数字角标）故意不共用
@@ -107,7 +108,14 @@ export function MessageRow({
   const contactCard = contactCardContentOf(msg);
 
   const retry = () => {
-    if (typeof msg.seq === 'number') retryMessage(topic, msg.seq)?.catch(() => onError?.('重试发送失败'));
+    if (typeof msg.seq !== 'number') return;
+    const seq = msg.seq;
+    // The original send most likely failed BECAUSE the topic was detached (see ConversationView's
+    // submit() for the same reasoning) -- retrying without re-attaching first would just fail the
+    // exact same way again.
+    ensureTopicAttached(topic.name)
+      .then(() => retryMessage(topic, seq))
+      .catch(() => onError?.('重试发送失败'));
   };
 
   return (