feat: show inline comment preview in list view

Add a comment preview section below memo cards in list view, displaying
up to 3 comment snippets with a "View all" link. Removes the old comment
count icon from the memo header in favor of this richer inline display.
Comment preview is hidden in memo detail view.

web/src/components/MemoView/MemoView.tsx

@@ -1,12 +1,14 @@
 import { memo, useMemo, useRef, useState } from "react";
+import { useLocation } from "react-router-dom";
 import useCurrentUser from "@/hooks/useCurrentUser";
 import { useUser } from "@/hooks/useUserQueries";
 import { cn } from "@/lib/utils";
 import { State } from "@/types/proto/api/v1/common_pb";
+import { MemoRelation_Type } from "@/types/proto/api/v1/memo_service_pb";
 import { isSuperUser } from "@/utils/user";
 import MemoEditor from "../MemoEditor";
 import PreviewImageDialog from "../PreviewImageDialog";
-import { MemoBody, MemoHeader } from "./components";
+import { MemoBody, MemoCommentListView, MemoHeader } from "./components";
 import { MEMO_CARD_BASE_CLASSES } from "./constants";
 import { useImagePreview, useMemoActions, useMemoHandlers } from "./hooks";
 import { MemoViewContext } from "./MemoViewContext";
@@ -42,6 +44,13 @@ const MemoView: React.FC<MemoViewProps> = (props: MemoViewProps) => {
     openPreview,
   });
 
+  const location = useLocation();
+  const isInMemoDetailPage = location.pathname.startsWith(`/${memoData.name}`);
+  const commentAmount = memoData.relations.filter(
+    (r) => r.type === MemoRelation_Type.COMMENT && r.relatedMemo?.name === memoData.name,
+  ).length;
+  const showCommentPreview = !isInMemoDetailPage && commentAmount > 0;
+
   const contextValue = useMemo(
     () => ({
       memo: memoData,
@@ -69,32 +78,47 @@ const MemoView: React.FC<MemoViewProps> = (props: MemoViewProps) => {
     );
   }
 
+  const article = (
+    <article
+      className={cn(MEMO_CARD_BASE_CLASSES, showCommentPreview ? "mb-0 rounded-b-none" : "mb-2", className)}
+      ref={cardRef}
+      tabIndex={readonly ? -1 : 0}
+    >
+      <MemoHeader
+        showCreator={props.showCreator}
+        showVisibility={props.showVisibility}
+        showPinned={props.showPinned}
+        onEdit={openEditor}
+        onGotoDetail={handleGotoMemoDetailPage}
+        onUnpin={unpinMemo}
+      />
+
+      <MemoBody
+        compact={props.compact}
+        onContentClick={handleMemoContentClick}
+        onContentDoubleClick={handleMemoContentDoubleClick}
+        onToggleNsfwVisibility={toggleNsfwVisibility}
+      />
+
+      <PreviewImageDialog
+        open={previewState.open}
+        onOpenChange={setPreviewOpen}
+        imgUrls={previewState.urls}
+        initialIndex={previewState.index}
+      />
+    </article>
+  );
+
   return (
     <MemoViewContext.Provider value={contextValue}>
-      <article className={cn(MEMO_CARD_BASE_CLASSES, className)} ref={cardRef} tabIndex={readonly ? -1 : 0}>
-        <MemoHeader
-          showCreator={props.showCreator}
-          showVisibility={props.showVisibility}
-          showPinned={props.showPinned}
-          onEdit={openEditor}
-          onGotoDetail={handleGotoMemoDetailPage}
-          onUnpin={unpinMemo}
-        />
-
-        <MemoBody
-          compact={props.compact}
-          onContentClick={handleMemoContentClick}
-          onContentDoubleClick={handleMemoContentDoubleClick}
-          onToggleNsfwVisibility={toggleNsfwVisibility}
-        />
-
-        <PreviewImageDialog
-          open={previewState.open}
-          onOpenChange={setPreviewOpen}
-          imgUrls={previewState.urls}
-          initialIndex={previewState.index}
-        />
-      </article>
+      {showCommentPreview ? (
+        <div className="mb-2">
+          {article}
+          <MemoCommentListView />
+        </div>
+      ) : (
+        article
+      )}
     </MemoViewContext.Provider>
   );
 };

web/src/components/MemoView/components/MemoCommentListView.tsx

@@ -0,0 +1,40 @@
+import { ArrowUpRightIcon } from "lucide-react";
+import { Link } from "react-router-dom";
+import { useMemoComments } from "@/hooks/useMemoQueries";
+import { useMemoViewContext, useMemoViewDerived } from "../MemoViewContext";
+
+const MemoCommentListView: React.FC = () => {
+  const { memo } = useMemoViewContext();
+  const { isInMemoDetailPage, commentAmount } = useMemoViewDerived();
+
+  const { data } = useMemoComments(memo.name, { enabled: !isInMemoDetailPage && commentAmount > 0 });
+  const comments = data?.memos ?? [];
+
+  if (isInMemoDetailPage || commentAmount === 0) {
+    return null;
+  }
+
+  const displayedComments = comments.slice(0, 3);
+
+  return (
+    <div className="border border-t-0 border-border rounded-b-xl px-4 pt-2 pb-3 flex flex-col gap-1">
+      <div className="flex items-center justify-between mb-1">
+        <span className="text-xs text-muted-foreground">Comments{commentAmount > 1 ? ` (${commentAmount})` : ""}</span>
+        <Link
+          to={`/${memo.name}#comments`}
+          className="flex items-center gap-0.5 text-xs text-muted-foreground hover:text-foreground hover:underline underline-offset-2 transition-colors"
+        >
+          View all
+          <ArrowUpRightIcon className="w-3 h-3" />
+        </Link>
+      </div>
+      {displayedComments.map((comment) => (
+        <div key={comment.name} className="bg-muted/60 rounded-md px-2 py-1 text-xs text-muted-foreground truncate leading-relaxed">
+          {comment.content}
+        </div>
+      ))}
+    </div>
+  );
+};
+
+export default MemoCommentListView;

web/src/components/MemoView/components/MemoHeader.tsx

@@ -1,5 +1,5 @@
 import { timestampDate } from "@bufbuild/protobuf/wkt";
-import { BookmarkIcon, MessageCircleMoreIcon } from "lucide-react";
+import { BookmarkIcon } from "lucide-react";
 import { useState } from "react";
 import { Link } from "react-router-dom";
 import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from "@/components/ui/tooltip";
@@ -20,8 +20,8 @@ const MemoHeader: React.FC<MemoHeaderProps> = ({ showCreator, showVisibility, sh
   const t = useTranslate();
   const [reactionSelectorOpen, setReactionSelectorOpen] = useState(false);
 
-  const { memo, creator, currentUser, parentPage, isArchived, readonly } = useMemoViewContext();
-  const { isInMemoDetailPage, commentAmount, relativeTimeFormat } = useMemoViewDerived();
+  const { memo, creator, currentUser, isArchived, readonly } = useMemoViewContext();
+  const { relativeTimeFormat } = useMemoViewDerived();
 
   const displayTime = isArchived ? (
     (memo.displayTime ? timestampDate(memo.displayTime) : undefined)?.toLocaleString(i18n.language)
@@ -52,18 +52,6 @@ const MemoHeader: React.FC<MemoHeaderProps> = ({ showCreator, showVisibility, sh
           />
         )}
 
-        {!isInMemoDetailPage && commentAmount > 0 && (
-          <Link
-            className={cn("flex flex-row justify-start items-center rounded-md px-1 hover:opacity-80 gap-0.5")}
-            to={`/${memo.name}#comments`}
-            viewTransition
-            state={{ from: parentPage }}
-          >
-            <MessageCircleMoreIcon className="w-4 h-4 mx-auto text-muted-foreground" />
-            <span className="text-xs text-muted-foreground">{commentAmount}</span>
-          </Link>
-        )}
-
         {showVisibility && memo.visibility !== Visibility.PRIVATE && (
           <Tooltip>
             <TooltipTrigger>

web/src/components/MemoView/components/index.ts

@@ -1,2 +1,3 @@
 export { default as MemoBody } from "./MemoBody";
+export { default as MemoCommentListView } from "./MemoCommentListView";
 export { default as MemoHeader } from "./MemoHeader";