diff --git a/src/page/workspace/channel/article-card.tsx b/src/page/workspace/channel/article-card.tsx
index 5da4cea..45de6e5 100644
--- a/src/page/workspace/channel/article-card.tsx
+++ b/src/page/workspace/channel/article-card.tsx
@@ -23,7 +23,7 @@ export default function ArticleCard({ article, onClick, className }: Props) {
   return (
     <article
       className={cn(
-        "group relative flex cursor-pointer flex-col overflow-hidden rounded-2xl border border-border/30 bg-card shadow-sm transition-all duration-300 hover:shadow-lg hover:-translate-y-0.5",
+        "group relative flex cursor-pointer flex-col overflow-hidden rounded-2xl border border-border/30 bg-card shadow-sm transition-[background-color,border-color,color,opacity,box-shadow,transform] duration-300 hover:shadow-lg hover:-translate-y-0.5",
         article.is_pinned && "ring-1 ring-amber-500/20",
         className,
       )}
@@ -53,7 +53,7 @@ export default function ArticleCard({ article, onClick, className }: Props) {
 
         {/* Pinned badge */}
         {article.is_pinned && (
-          <span className="absolute left-2 top-2 inline-flex items-center gap-1 rounded-full bg-amber-500/90 px-2 py-0.5 text-[10px] font-medium text-white backdrop-blur-sm">
+          <span className="absolute left-2 top-2 inline-flex items-center gap-1 rounded-full bg-warning/90 px-2 py-0.5 text-[10px] font-medium text-warning-foreground backdrop-blur-sm">
             <Pin className="size-2.5" />
             Pinned
           </span>
diff --git a/src/page/workspace/channel/article-composer.tsx b/src/page/workspace/channel/article-composer.tsx
index 4c224f5..bb7ccad 100644
--- a/src/page/workspace/channel/article-composer.tsx
+++ b/src/page/workspace/channel/article-composer.tsx
@@ -43,7 +43,7 @@ export default function ArticleComposer({
   );
 
   // Auto-save indicator
-  const autoSaveTimer = useRef<ReturnType<typeof setTimeout>>();
+  const autoSaveTimer = useRef<ReturnType<typeof setTimeout> | undefined>(undefined);
   useEffect(() => {
     if (!draft) return;
     if (autoSaveTimer.current) clearTimeout(autoSaveTimer.current);
diff --git a/src/page/workspace/channel/article-detail.tsx b/src/page/workspace/channel/article-detail.tsx
index bf7e0dc..82644d3 100644
--- a/src/page/workspace/channel/article-detail.tsx
+++ b/src/page/workspace/channel/article-detail.tsx
@@ -162,7 +162,7 @@ export default function ArticleDetail({
           <h2 className="truncate text-sm font-semibold">Article Detail</h2>
         </div>
         {article.is_pinned && (
-          <span className="inline-flex items-center gap-1 rounded-full bg-amber-500/10 px-2 py-0.5 text-[11px] font-medium text-amber-600/70">
+          <span className="inline-flex items-center gap-1 rounded-full bg-warning/10 px-2 py-0.5 text-[11px] font-medium text-warning/70">
             <Pin className="size-3" />
             Pinned
           </span>
@@ -249,7 +249,7 @@ export default function ArticleDetail({
           <div className="mt-4 flex justify-center">
             <button
               className={cn(
-                "inline-flex cursor-pointer items-center gap-2 rounded-full px-5 py-2.5 text-sm font-medium transition-all duration-200",
+                "inline-flex cursor-pointer items-center gap-2 rounded-full px-5 py-2.5 text-sm font-medium transition-[background-color,border-color,color,opacity,box-shadow,transform] duration-200",
                 liked
                   ? "bg-rose-500/10 text-rose-500 ring-1 ring-rose-500/20"
                   : "bg-muted/50 text-muted-foreground/60 hover:bg-rose-500/[0.04] hover:text-rose-500/70",
@@ -260,7 +260,7 @@ export default function ArticleDetail({
             >
               <Heart
                 className={cn(
-                  "size-[18px] transition-all",
+                  "size-[18px] transition-[fill,color,transform]",
                   liked && "fill-rose-500",
                 )}
               />
diff --git a/src/page/workspace/channel/article-feed.tsx b/src/page/workspace/channel/article-feed.tsx
index dba83e2..5683a93 100644
--- a/src/page/workspace/channel/article-feed.tsx
+++ b/src/page/workspace/channel/article-feed.tsx
@@ -143,7 +143,7 @@ export default function ArticleFeed({ roomId, roomName, currentUserId, onCompose
   const { onEvent } = useChannelSocket();
   useEffect(() => {
     return onEvent((event) => {
-      if (!event.room || event.room.id !== roomId) return;
+      if (!('room' in event) || !event.room || event.room.id !== roomId) return;
 
       if (event.type === "article.liked" || event.type === "article.unliked") {
         const d = event.data as { article_id: string; like_count: number };
diff --git a/src/page/workspace/channel/channel-header.tsx b/src/page/workspace/channel/channel-header.tsx
index bb23dda..17f5518 100644
--- a/src/page/workspace/channel/channel-header.tsx
+++ b/src/page/workspace/channel/channel-header.tsx
@@ -56,7 +56,7 @@ export function ChannelHeader({
         <Tooltip>
           <TooltipTrigger
             aria-label="Channel settings"
-            className="inline-flex size-8 cursor-pointer items-center justify-center rounded-lg text-muted-foreground/40 transition-all duration-150 hover:bg-accent/40 hover:text-foreground"
+            className="inline-flex size-8 cursor-pointer items-center justify-center rounded-lg text-muted-foreground/40 transition-[background-color,border-color,color,opacity,box-shadow,transform] duration-150 hover:bg-accent/40 hover:text-foreground"
             onClick={onToggleSettings}
           >
             <Settings className="size-[18px]" />
diff --git a/src/page/workspace/channel/channel-sidebar.tsx b/src/page/workspace/channel/channel-sidebar.tsx
index d0b6573..40bf638 100644
--- a/src/page/workspace/channel/channel-sidebar.tsx
+++ b/src/page/workspace/channel/channel-sidebar.tsx
@@ -57,9 +57,9 @@ function RoomLink({
   return (
     <Link
       className={cn(
-        "group flex h-8 items-center gap-2 rounded-lg px-2.5 text-[13px] transition-all duration-150",
+        "group flex h-9 items-center gap-2 rounded-lg px-2.5 text-[13px] transition-[background-color,color,box-shadow] duration-150",
         active
-          ? "bg-primary/[0.08] font-semibold text-foreground shadow-[inset_0_0_0_1px_rgba(var(--color-primary),0.08)]"
+          ? "bg-primary/[0.08] font-semibold text-foreground ring-1 ring-primary/10"
           : "text-muted-foreground/70 hover:bg-accent/50 hover:text-foreground",
       )}
       to={`/${projectName}/channel/${room.id}`}
@@ -203,7 +203,7 @@ export default function ChannelSidebar({
         {onCreateChannel && (
           <button
             aria-label="Create channel"
-            className="inline-flex size-7 items-center justify-center rounded-md text-muted-foreground/40 transition-all duration-150 hover:bg-accent hover:text-foreground"
+            className="inline-flex size-8 items-center justify-center rounded-lg text-muted-foreground/40 transition-[background-color,color] duration-150 hover:bg-accent hover:text-foreground"
             onClick={onCreateChannel}
             type="button"
           >
@@ -250,7 +250,7 @@ export default function ChannelSidebar({
             </p>
             {onCreateChannel && (
               <button
-                className="mt-3 inline-flex cursor-pointer items-center gap-1.5 rounded-lg px-4 py-2 text-sm font-medium text-primary transition-all duration-150 hover:bg-primary/[0.08]"
+                className="mt-3 inline-flex cursor-pointer items-center gap-1.5 rounded-lg px-4 py-2 text-sm font-medium text-primary transition-[background-color,color] duration-150 hover:bg-primary/10"
                 onClick={onCreateChannel}
                 type="button"
               >
diff --git a/src/page/workspace/channel/composer.tsx b/src/page/workspace/channel/composer.tsx
index e11a5be..226554b 100644
--- a/src/page/workspace/channel/composer.tsx
+++ b/src/page/workspace/channel/composer.tsx
@@ -96,7 +96,8 @@ export default function MessageComposer({
             </p>
           </div>
           <Button
-            className="size-6 shrink-0 cursor-pointer text-muted-foreground/30 hover:text-foreground"
+            aria-label="Cancel reply"
+            className="size-8 shrink-0 cursor-pointer text-muted-foreground/30 hover:text-foreground"
             onClick={onCancelReply}
             size="icon"
             variant="ghost"
@@ -108,7 +109,7 @@ export default function MessageComposer({
 
       <div
         className={cn(
-          "relative rounded-2xl border bg-card/80 shadow-sm transition-all duration-200",
+          "relative rounded-2xl border bg-card/80 shadow-sm transition-[background-color,border-color,box-shadow] duration-200",
           "focus-within:border-primary/20 focus-within:shadow-md focus-within:ring-1 focus-within:ring-primary/[0.06] focus-within:bg-card",
           replyTarget ? "border-primary/[0.12]" : "border-border/40",
         )}
@@ -133,8 +134,9 @@ export default function MessageComposer({
         <div className="absolute right-2 bottom-2 flex items-center gap-1">
           <FileUploadButton disabled={disabled || sending} />
           <Button
+            aria-label="Send message"
             className={cn(
-              "size-8 rounded-lg transition-all duration-200",
+              "size-9 rounded-lg transition-[opacity,transform,background-color,color] duration-200",
               hasContent
                 ? "scale-100 opacity-100"
                 : "scale-90 opacity-40",
diff --git a/src/page/workspace/channel/file-upload.tsx b/src/page/workspace/channel/file-upload.tsx
index 4fcc870..d699e60 100644
--- a/src/page/workspace/channel/file-upload.tsx
+++ b/src/page/workspace/channel/file-upload.tsx
@@ -157,7 +157,8 @@ export default function FileUploadButton({
                 )}
               </div>
               <Button
-                className="size-6 shrink-0 cursor-pointer rounded-md text-muted-foreground/40 hover:bg-accent/50 hover:text-foreground"
+                aria-label="Remove file"
+                className="size-8 shrink-0 cursor-pointer rounded-lg text-muted-foreground/40 hover:bg-accent/50 hover:text-foreground"
                 onClick={() => removeFile(file.id)}
                 size="icon"
                 variant="ghost"
diff --git a/src/page/workspace/channel/message-content.tsx b/src/page/workspace/channel/message-content.tsx
index 10e1062..ec86594 100644
--- a/src/page/workspace/channel/message-content.tsx
+++ b/src/page/workspace/channel/message-content.tsx
@@ -1,6 +1,8 @@
 import { useMemo } from "react";
 import RepoEmbedCard from "./repo-embed-card";
-import { parseRepoLinks, type RepoLinkMatch } from "./repo-link-parser";
+import XEmbedCard from "./x-embed-card";
+import { parseRepoLinks } from "./repo-link-parser";
+import { parseXLinks } from "./x-link-parser";
 
 type Props = {
   content: string;
@@ -9,60 +11,86 @@ type Props = {
 
 /**
  * Renders message content, detecting same-origin repo links and
- * replacing them with RepoEmbedCards.
+ * X/Twitter links, replacing them with embed cards.
  */
 export default function MessageContent({ content, contentType }: Props) {
-  const { textParts, embeds } = useMemo(() => {
-    const links = parseRepoLinks(content);
-    if (links.length === 0) return { textParts: [content], embeds: [] };
-
-    const embeds: RepoLinkMatch[] = [];
-    const textParts: string[] = [];
-    let lastIndex = 0;
-
-    for (const link of links) {
-      const idx = content.indexOf(link.url, lastIndex);
-      if (idx === -1) continue;
-
-      // Text before this link
-      if (idx > lastIndex) {
-        textParts.push(content.slice(lastIndex, idx));
-      }
-      embeds.push(link);
-      lastIndex = idx + link.url.length;
-    }
-
-    // Remaining text after last link
-    if (lastIndex < content.length) {
-      textParts.push(content.slice(lastIndex));
-    }
-
-    return { textParts, embeds };
-  }, [content]);
-
   const isPlainText = contentType === "text" || !contentType;
 
-  return (
-    <div>
-      {textParts.map((part, i) => {
-        const trimmed = part.trim();
-        if (!trimmed && embeds.length > 0) return null;
-        return (
+  const elements = useMemo(() => {
+    const repoLinks = parseRepoLinks(content);
+    const xLinks = parseXLinks(content);
+
+    const allLinks = [
+      ...repoLinks.map((l) => ({ kind: "repo" as const, url: l.url, data: l, index: content.indexOf(l.url) })),
+      ...xLinks.map((l) => ({ kind: "x" as const, url: l.url, data: l, index: content.indexOf(l.url) })),
+    ].sort((a, b) => a.index - b.index);
+
+    if (allLinks.length === 0) {
+      return [
+        <p
+          className={
+            isPlainText
+              ? "whitespace-pre-wrap break-words text-[13px] leading-[1.55] text-foreground/85"
+              : "whitespace-pre-wrap break-words text-[13px] text-foreground/85"
+          }
+          key="only"
+        >
+          {content}
+        </p>,
+      ];
+    }
+
+    const result: React.ReactNode[] = [];
+    let cursor = 0;
+
+    for (const link of allLinks) {
+      if (link.index > cursor) {
+        const text = content.slice(cursor, link.index);
+        if (text.trim()) {
+          result.push(
+            <p
+              className={
+                isPlainText
+                  ? "whitespace-pre-wrap break-words text-[13px] leading-[1.55] text-foreground/85"
+                  : "whitespace-pre-wrap break-words text-[13px] text-foreground/85"
+              }
+              key={`t-${cursor}`}
+            >
+              {text}
+            </p>,
+          );
+        }
+      }
+
+      if (link.kind === "repo") {
+        result.push(<RepoEmbedCard key={`repo-${link.url}`} link={link.data} />);
+      } else {
+        result.push(<XEmbedCard key={`x-${link.url}`} link={link.data} />);
+      }
+
+      cursor = link.index + link.url.length;
+    }
+
+    if (cursor < content.length) {
+      const text = content.slice(cursor);
+      if (text.trim()) {
+        result.push(
           <p
             className={
               isPlainText
                 ? "whitespace-pre-wrap break-words text-[13px] leading-[1.55] text-foreground/85"
                 : "whitespace-pre-wrap break-words text-[13px] text-foreground/85"
             }
-            key={`t-${i}`}
+            key={`t-${cursor}`}
           >
-            {isPlainText ? part : part}
-          </p>
+            {text}
+          </p>,
         );
-      })}
-      {embeds.map((link) => (
-        <RepoEmbedCard key={link.url} link={link} />
-      ))}
-    </div>
-  );
+      }
+    }
+
+    return result;
+  }, [content, isPlainText]);
+
+  return <div>{elements}</div>;
 }
diff --git a/src/page/workspace/channel/message-item.tsx b/src/page/workspace/channel/message-item.tsx
index 08f832b..02b79be 100644
--- a/src/page/workspace/channel/message-item.tsx
+++ b/src/page/workspace/channel/message-item.tsx
@@ -184,8 +184,8 @@ export default function MessageItem({
       className={cn(
         "group relative flex gap-3 transition-colors duration-150",
         isCompact
-          ? "items-start px-4 py-0 hover:bg-black/[0.025]"
-          : "items-start px-4 py-1 hover:bg-black/[0.03]",
+          ? "items-start px-4 py-0 hover:bg-muted/30"
+          : "items-start px-4 py-1 hover:bg-muted/40",
       )}
     >
       {isCompact ? (
@@ -228,7 +228,7 @@ export default function MessageItem({
               </span>
             )}
             {isPinned && (
-              <span className="text-amber-500/60" title="Pinned">
+              <span className="text-warning/60" title="Pinned">
                 <Pin className="size-3" />
               </span>
             )}
@@ -237,16 +237,18 @@ export default function MessageItem({
 
         {/* Reply context indicator */}
         {message.in_reply_to && (
-          <div
+          <button
             className={cn(
-              "mb-1 flex items-center gap-1.5 rounded-md border border-border/20 bg-muted/[0.08] px-2.5 py-1 text-left",
-              repliedMessage && "cursor-pointer transition-colors hover:bg-muted/[0.15] hover:border-border/30",
+              "mb-1 flex w-full items-center gap-1.5 rounded-lg border border-border/30 bg-muted/20 px-2.5 py-1 text-left",
+              repliedMessage && "cursor-pointer transition-colors hover:border-border/50 hover:bg-muted/40",
+              !repliedMessage && "cursor-default",
             )}
+            disabled={!repliedMessage}
             onClick={() => {
               if (repliedMessage) onReply?.(repliedMessage);
             }}
             title={replyPreview ? `Replying to: ${replyPreview}` : "Replying to a message"}
-            role={repliedMessage ? "button" : undefined}
+            type="button"
           >
             <CornerDownRight className="size-3 shrink-0 text-primary/50" />
             {replyAuthor ? (
@@ -263,7 +265,7 @@ export default function MessageItem({
                 {replyPreview}
               </span>
             )}
-          </div>
+          </button>
         )}
 
         {editing ? (
@@ -290,7 +292,7 @@ export default function MessageItem({
 
         {threadForMessage && !message.thread && (
           <button
-            className="mt-1.5 flex items-center gap-1.5 rounded-lg border border-border/20 bg-muted/[0.05] px-2.5 py-1 text-[12px] font-medium text-primary/60 transition-all duration-150 hover:bg-primary/[0.05] hover:text-primary hover:border-primary/15 hover:shadow-sm"
+            className="mt-1.5 flex items-center gap-1.5 rounded-lg border border-border/30 bg-muted/20 px-2.5 py-1 text-[12px] font-medium text-primary/70 transition-[background-color,border-color,color,box-shadow] duration-150 hover:border-primary/20 hover:bg-primary/10 hover:text-primary hover:shadow-sm"
             onClick={() => onViewThread?.(threadForMessage.id, message.seq)}
             type="button"
           >
@@ -304,7 +306,7 @@ export default function MessageItem({
             {message.reactions.map((r) => (
               <button
                 className={cn(
-                  "inline-flex cursor-pointer items-center gap-1 rounded-lg border px-2 py-[2px] text-xs transition-all duration-150",
+                  "inline-flex cursor-pointer items-center gap-1 rounded-lg border px-2 py-[2px] text-xs transition-[background-color,border-color,color] duration-150",
                   r.reacted_by_me
                     ? "border-primary/15 bg-primary/[0.06] text-primary hover:bg-primary/[0.1]"
                     : "border-border/30 bg-muted/20 text-muted-foreground/60 hover:border-border/50 hover:bg-muted/40",
@@ -320,7 +322,7 @@ export default function MessageItem({
             <ReactionPicker
               onSelect={(emoji) => handleReaction(emoji)}
               trigger={
-                <button className="inline-flex size-6 cursor-pointer items-center justify-center rounded-lg border border-dashed border-border/30 text-muted-foreground/25 opacity-0 transition-all duration-150 hover:border-primary/25 hover:text-primary/50 group-hover:opacity-100">
+                <button aria-label="Add reaction" className="inline-flex size-8 cursor-pointer items-center justify-center rounded-lg border border-dashed border-border/30 text-muted-foreground/30 opacity-60 transition-[border-color,color,opacity] duration-150 hover:border-primary/25 hover:text-primary/60 group-hover:opacity-100" type="button">
                   <SmilePlus className="size-3" />
                 </button>
               }
@@ -329,12 +331,13 @@ export default function MessageItem({
         )}
       </div>
 
-      <div className="absolute right-2 top-0 z-10 flex items-center gap-[1px] rounded-lg border border-border/20 bg-card/95 px-1 py-1 shadow-md backdrop-blur-sm opacity-0 transition-all duration-150 group-hover:opacity-100">
+      <div className="absolute right-2 top-0 z-10 flex items-center gap-[1px] rounded-xl border border-border/30 bg-card/95 px-1 py-1 opacity-0 shadow-md backdrop-blur-sm transition-opacity duration-150 group-focus-within:opacity-100 group-hover:opacity-100">
         <ReactionPicker
           onSelect={(emoji) => handleReaction(emoji)}
           trigger={
             <Button
-              className="size-7 cursor-pointer rounded-md text-muted-foreground/50 hover:text-foreground hover:bg-accent/50"
+              aria-label="Add reaction"
+              className="size-8 cursor-pointer rounded-lg text-muted-foreground/50 hover:bg-accent/50 hover:text-foreground"
               size="icon"
               title="Add reaction"
               variant="ghost"
@@ -345,7 +348,8 @@ export default function MessageItem({
         />
 
         <Button
-          className="size-7 cursor-pointer rounded-md text-muted-foreground/50 hover:text-foreground hover:bg-accent/50"
+          aria-label="Reply"
+          className="size-8 cursor-pointer rounded-lg text-muted-foreground/50 hover:bg-accent/50 hover:text-foreground"
           onClick={() => onReply?.(message)}
           size="icon"
           title="Reply"
@@ -355,7 +359,8 @@ export default function MessageItem({
         </Button>
 
         <Button
-          className="size-7 cursor-pointer rounded-md text-muted-foreground/50 hover:text-foreground hover:bg-accent/50"
+          aria-label={threadForMessage ? "View thread" : "Start thread"}
+          className="size-8 cursor-pointer rounded-lg text-muted-foreground/50 hover:bg-accent/50 hover:text-foreground"
           onClick={() =>
             threadForMessage
               ? onViewThread?.(threadForMessage.id, message.seq)
@@ -371,7 +376,8 @@ export default function MessageItem({
         <DropdownMenu>
           <DropdownMenuTrigger>
             <Button
-              className="size-7 cursor-pointer rounded-md text-muted-foreground/50 hover:text-foreground hover:bg-accent/50"
+              aria-label="More message actions"
+              className="size-8 cursor-pointer rounded-lg text-muted-foreground/50 hover:bg-accent/50 hover:text-foreground"
               size="icon"
               title="More"
               variant="ghost"
@@ -482,7 +488,7 @@ function ReactionPicker({
         <div className="grid grid-cols-8 gap-0.5">
           {REACTIONS_PALETTE.map((emoji) => (
             <button
-              className="grid size-8 cursor-pointer place-items-center rounded-md text-lg transition-all duration-150 hover:scale-110 hover:bg-accent/50"
+              className="grid size-9 cursor-pointer place-items-center rounded-lg text-lg transition-[background-color,transform] duration-150 hover:scale-105 hover:bg-accent/50"
               key={emoji}
               onClick={() => onSelect(emoji)}
               title={emoji}
diff --git a/src/page/workspace/channel/message-view.tsx b/src/page/workspace/channel/message-view.tsx
index 29ccea1..ef9c25e 100644
--- a/src/page/workspace/channel/message-view.tsx
+++ b/src/page/workspace/channel/message-view.tsx
@@ -91,6 +91,7 @@ export default function MessageView({
   const bottomRef = useRef<HTMLDivElement>(null);
   const [atBottom, setAtBottom] = useState(true);
   const [newMsgCount, setNewMsgCount] = useState(0);
+  const [initialLoaded, setInitialLoaded] = useState(false);
   const prevMsgCountRef = useRef(0);
   const [replyTarget, setReplyTarget] = useState<MessageNewService | null>(null);
 
@@ -141,26 +142,45 @@ export default function MessageView({
     [renderedItems],
   );
 
+  /* eslint-disable react-hooks/set-state-in-effect */
   useEffect(() => {
     prevMsgCountRef.current = 0;
     setNewMsgCount(0);
-    bottomRef.current?.scrollIntoView();
-    // eslint-disable-next-line react-hooks/exhaustive-deps
+    setInitialLoaded(false);
   }, [roomId]);
+  /* eslint-enable react-hooks/set-state-in-effect */
 
+  // Scroll to bottom after initial messages load
+  useEffect(() => {
+    if (!initialLoaded && !loading && messageCount > 0) {
+      // eslint-disable-next-line react-hooks/set-state-in-effect -- one-time scroll after load
+      setInitialLoaded(true);
+      requestAnimationFrame(() => {
+        if (scrollRef.current) {
+          scrollRef.current.scrollTop = scrollRef.current.scrollHeight;
+        }
+      });
+    }
+  }, [initialLoaded, loading, messageCount]);
+
+  // Auto-scroll on new messages (after initial load)
   useEffect(() => {
     const prev = prevMsgCountRef.current;
     prevMsgCountRef.current = messageCount;
 
+    if (!initialLoaded) return;
+
     if (messageCount > prev && prev > 0 && !loading) {
       if (atBottom) {
         bottomRef.current?.scrollIntoView({ behavior: "smooth" });
+        /* eslint-disable react-hooks/set-state-in-effect */
         setNewMsgCount(0);
+        /* eslint-enable react-hooks/set-state-in-effect */
       } else {
         setNewMsgCount((c) => c + (messageCount - prev));
       }
     }
-  }, [messageCount, loading, atBottom]);
+  }, [messageCount, loading, atBottom, initialLoaded]);
 
   const handleScroll = useCallback(() => {
     const el = scrollRef.current;
@@ -205,12 +225,12 @@ export default function MessageView({
     <div className="flex min-h-0 flex-1 flex-col">
       {pinnedMessages.length > 0 && (
         <button
-          className="flex shrink-0 w-full cursor-pointer items-center gap-2 border-b border-amber-500/10 bg-amber-500/[0.03] px-4 py-2 text-left transition-colors hover:bg-amber-500/[0.06]"
+          className="flex shrink-0 w-full cursor-pointer items-center gap-2 border-b border-warning/10 bg-warning/[0.03] px-4 py-2 text-left transition-colors hover:bg-warning/[0.06]"
           type="button"
           title={`${pinnedMessages.length} pinned message${pinnedMessages.length > 1 ? "s" : ""}`}
         >
-          <Pin className="size-3.5 text-amber-500/50" />
-          <span className="truncate text-[12px] font-medium text-amber-600/60">
+          <Pin className="size-3.5 text-warning/50" />
+          <span className="truncate text-[12px] font-medium text-warning/60">
             {pinnedMessages.length} pinned message
             {pinnedMessages.length > 1 ? "s" : ""}
           </span>
@@ -320,12 +340,12 @@ export default function MessageView({
             </div>
           ))}
 
-          <div ref={bottomRef} />
+          <div ref={bottomRef} className="mb-4" />
         </div>
 
         {newMsgCount > 0 && (
           <button
-            className="absolute bottom-3 left-1/2 z-20 flex -translate-x-1/2 cursor-pointer items-center gap-1.5 rounded-full bg-primary px-4 py-1.5 text-xs font-medium text-primary-foreground shadow-lg transition-all duration-200 hover:bg-primary/90 hover:shadow-xl"
+            className="absolute bottom-3 left-1/2 z-20 flex -translate-x-1/2 cursor-pointer items-center gap-1.5 rounded-full bg-primary px-4 py-1.5 text-xs font-medium text-primary-foreground shadow-lg transition-[background-color,border-color,color,opacity,box-shadow,transform] duration-200 hover:bg-primary/90 hover:shadow-xl"
             onClick={handleScrollToBottom}
           >
             <ChevronDown className="size-3.5" />
diff --git a/src/page/workspace/channel/repo-drawer.tsx b/src/page/workspace/channel/repo-drawer.tsx
index 04f8129..a67edf8 100644
--- a/src/page/workspace/channel/repo-drawer.tsx
+++ b/src/page/workspace/channel/repo-drawer.tsx
@@ -1,6 +1,7 @@
 import { ExternalLink } from "lucide-react";
 import RightDrawer from "@/components/right-drawer";
 import { useDrawer } from "@/hooks/use-drawer";
+import RepoView from "@/components/repo/repo-view";
 
 type Props = {
   workspace: string;
@@ -33,12 +34,9 @@ export default function RepoDrawer({ workspace, repo, children }: Props) {
         onClose={closeDrawer}
         open={open}
         title={`${workspace}/${repo}`}
+        width="max-w-[90vw]"
       >
-        <iframe
-          className="min-h-0 flex-1 w-full border-0"
-          src={repoUrl}
-          title={`${workspace}/${repo}`}
-        />
+        <RepoView repo={repo} workspace={workspace} />
       </RightDrawer>
     </>
   );
diff --git a/src/page/workspace/channel/repo-embed-card.tsx b/src/page/workspace/channel/repo-embed-card.tsx
index 362ff50..c627adc 100644
--- a/src/page/workspace/channel/repo-embed-card.tsx
+++ b/src/page/workspace/channel/repo-embed-card.tsx
@@ -105,7 +105,7 @@ export default function RepoEmbedCard({ link }: { link: RepoLinkMatch }) {
 
   return (
     <RepoDrawer repo={link.repo} workspace={link.workspace}>
-      <div className="mt-2 block max-w-[420px] rounded-xl border border-border/30 bg-muted/[0.03] p-4 transition-all duration-200 hover:border-primary/20 hover:bg-muted/[0.08] hover:shadow-sm">
+      <div className="mt-2 block max-w-[420px] rounded-xl border border-border/30 bg-muted/[0.03] p-4 transition-[background-color,border-color,color,opacity,box-shadow,transform] duration-200 hover:border-primary/20 hover:bg-muted/[0.08] hover:shadow-sm">
       {loading ? (
         <div className="flex items-center gap-2 py-2 text-[13px] text-muted-foreground/50">
           <Loader2 className="size-4 animate-spin" />
diff --git a/src/page/workspace/channel/room-create-dialog.tsx b/src/page/workspace/channel/room-create-dialog.tsx
index ffa875d..5d573c9 100644
--- a/src/page/workspace/channel/room-create-dialog.tsx
+++ b/src/page/workspace/channel/room-create-dialog.tsx
@@ -116,7 +116,7 @@ export default function RoomCreateDialog({
             <Label className="text-[13px]">Channel type</Label>
             <div className="flex gap-2">
               <button
-                className={`flex flex-1 cursor-pointer items-center gap-2 rounded-lg border px-3 py-2.5 text-sm transition-all ${
+                className={`flex flex-1 cursor-pointer items-center gap-2 rounded-lg border px-3 py-2.5 text-sm transition-[background-color,border-color,color,box-shadow] ${
                   channelType === "channel"
                     ? "border-primary/40 bg-primary/[0.06] text-foreground"
                     : "border-border/30 text-muted-foreground/60 hover:border-border/50"
@@ -128,7 +128,7 @@ export default function RoomCreateDialog({
                 Chat
               </button>
               <button
-                className={`flex flex-1 cursor-pointer items-center gap-2 rounded-lg border px-3 py-2.5 text-sm transition-all ${
+                className={`flex flex-1 cursor-pointer items-center gap-2 rounded-lg border px-3 py-2.5 text-sm transition-[background-color,border-color,color,box-shadow] ${
                   channelType === "article"
                     ? "border-primary/40 bg-primary/[0.06] text-foreground"
                     : "border-border/30 text-muted-foreground/60 hover:border-border/50"
diff --git a/src/page/workspace/channel/room-dnd-toggle.tsx b/src/page/workspace/channel/room-dnd-toggle.tsx
index 291aee8..9c70f9d 100644
--- a/src/page/workspace/channel/room-dnd-toggle.tsx
+++ b/src/page/workspace/channel/room-dnd-toggle.tsx
@@ -50,9 +50,9 @@ export default function RoomDndToggle({ roomId }: Props) {
       <PopoverTrigger>
         <Button
           className={cn(
-            "size-8 cursor-pointer rounded-lg transition-all duration-150",
+            "size-8 cursor-pointer rounded-lg transition-[background-color,border-color,color,opacity,box-shadow,transform] duration-150",
             dnd.do_not_disturb
-              ? "text-amber-500 hover:bg-accent/40"
+              ? "text-warning hover:bg-accent/40"
               : "text-muted-foreground/40 hover:bg-accent/40 hover:text-muted-foreground",
           )}
           size="icon"
diff --git a/src/page/workspace/channel/thread-pane.tsx b/src/page/workspace/channel/thread-pane.tsx
index e1ed937..eaa0b89 100644
--- a/src/page/workspace/channel/thread-pane.tsx
+++ b/src/page/workspace/channel/thread-pane.tsx
@@ -128,7 +128,7 @@ export default function ThreadPane({ thread, roomId, onClose }: Props) {
       {/* Header */}
       <div className="flex h-[52px] shrink-0 items-center gap-3 border-b border-border/40 px-4">
         <Button
-          className="size-7 shrink-0 cursor-pointer rounded-lg text-muted-foreground/40 hover:bg-accent/50 hover:text-foreground"
+          className="size-8 shrink-0 cursor-pointer rounded-lg text-muted-foreground/40 hover:bg-accent/50 hover:text-foreground"
           onClick={onClose}
           size="icon"
           variant="ghost"
@@ -229,7 +229,7 @@ export default function ThreadPane({ thread, roomId, onClose }: Props) {
       <div className="shrink-0 border-t border-border/40 p-3">
         <div
           className={cn(
-            "flex items-end gap-2 rounded-xl border bg-card px-3 py-2 transition-all duration-200",
+            "flex items-end gap-2 rounded-xl border bg-card px-3 py-2 transition-[background-color,border-color,color,opacity,box-shadow,transform] duration-200",
             "focus-within:border-primary/20 focus-within:ring-1 focus-within:ring-primary/[0.06]",
             "border-border/50",
           )}
diff --git a/src/page/workspace/channel/thread-sidebar.tsx b/src/page/workspace/channel/thread-sidebar.tsx
index 298a209..aa2635c 100644
--- a/src/page/workspace/channel/thread-sidebar.tsx
+++ b/src/page/workspace/channel/thread-sidebar.tsx
@@ -109,7 +109,7 @@ export default function ThreadSidebar({
         </div>
         {onClose && (
           <Button
-            className="size-7 cursor-pointer rounded-lg text-muted-foreground/30 hover:bg-accent/50 hover:text-foreground"
+            className="size-8 cursor-pointer rounded-lg text-muted-foreground/30 hover:bg-accent/50 hover:text-foreground"
             onClick={onClose}
             size="icon"
             variant="ghost"
@@ -136,7 +136,7 @@ export default function ThreadSidebar({
           return (
             <button
               className={cn(
-                "relative flex-1 cursor-pointer rounded-md px-2 py-1.5 text-[11px] font-medium transition-all duration-150",
+                "relative flex-1 cursor-pointer rounded-md px-2 py-1.5 text-[11px] font-medium transition-[background-color,border-color,color,opacity,box-shadow,transform] duration-150",
                 isActive
                   ? "text-primary"
                   : "text-muted-foreground/40 hover:text-muted-foreground/70",
@@ -193,7 +193,7 @@ export default function ThreadSidebar({
 
           return (
             <button
-              className="group flex w-full cursor-pointer gap-3 border-b border-border/[0.06] px-4 py-3 text-left transition-all duration-150 hover:bg-accent/[0.03] active:bg-accent/[0.06]"
+              className="group flex w-full cursor-pointer gap-3 border-b border-border/[0.06] px-4 py-3 text-left transition-[background-color,border-color,color,opacity,box-shadow,transform] duration-150 hover:bg-accent/[0.03] active:bg-accent/[0.06]"
               key={thread.id}
               onClick={() => onSelect?.(thread)}
               type="button"
diff --git a/src/page/workspace/channel/use-article-draft.ts b/src/page/workspace/channel/use-article-draft.ts
index 3062860..6dfd2a3 100644
--- a/src/page/workspace/channel/use-article-draft.ts
+++ b/src/page/workspace/channel/use-article-draft.ts
@@ -36,8 +36,8 @@ function saveDraft(draft: ArticleDraft | null) {
 }
 
 export function useArticleDraft(defaultChannel?: string) {
-  const [draft, setDraftState] = useState<ArticleDraft | null>(loadDraft);
-  const timerRef = useRef<ReturnType<typeof setTimeout>>();
+  const [draft, setDraftState] = useState<ArticleDraft | null>(() => loadDraft());
+  const timerRef = useRef<ReturnType<typeof setTimeout> | undefined>(undefined);
   const draftRef = useRef(draft);
 
   // Debounced persist