fix(issues): UI polish batch — comment input, card gap, board title, activity coalescing

- CommentInput: remove border-t divider, position submit button inside
  editor area (bottom-right) for cleaner look
- CommentCard: add !gap-0 to override Card's default gap-4
- CommentInput/ReplyInput: strip trailing empty lines from markdown
  before submit to prevent extra blank lines in rendered comments
- BoardCard: use normal text color for title instead of muted+hover
- Timeline: coalesce same actor + same action within 2 min window,
  keeping only the final result (e.g. 5 status changes → 1)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/features/issues/components/board-card.tsx

@@ -91,7 +91,7 @@ export function BoardCardContent({
 
       {/* Title */}
       <p
-        className={`text-sm font-medium leading-snug line-clamp-2 text-muted-foreground transition-colors group-hover:text-foreground ${showPriority ? "mt-2" : ""}`}
+        className={`text-sm font-medium leading-snug line-clamp-2 ${showPriority ? "mt-2" : ""}`}
       >
         {issue.title}
       </p>

apps/web/features/issues/components/comment-card.tsx

@@ -168,7 +168,7 @@ function CommentCard({
   collectReplies(entry.id);
 
   return (
-    <Card className={`!py-0 overflow-hidden${entry.id.startsWith("temp-") ? " opacity-60" : ""}`}>
+    <Card className={`!py-0 !gap-0 overflow-hidden${entry.id.startsWith("temp-") ? " opacity-60" : ""}`}>
       {/* Parent comment */}
       <div className="px-4">
         <CommentRow

apps/web/features/issues/components/comment-input.tsx

@@ -15,7 +15,7 @@ function CommentInput({ onSubmit }: CommentInputProps) {
   const [submitting, setSubmitting] = useState(false);
 
   const handleSubmit = async () => {
-    const content = editorRef.current?.getMarkdown()?.trim();
+    const content = editorRef.current?.getMarkdown()?.replace(/(\n\s*)+$/, "").trim();
     if (!content || submitting) return;
     setSubmitting(true);
     try {
@@ -28,8 +28,8 @@ function CommentInput({ onSubmit }: CommentInputProps) {
   };
 
   return (
-    <div className="rounded-lg bg-card ring-1 ring-border">
-      <div className="min-h-20 max-h-48 overflow-y-auto px-3 py-2">
+    <div className="relative rounded-lg bg-card ring-1 ring-border">
+      <div className="min-h-20 max-h-48 overflow-y-auto px-3 py-2 pb-8">
         <RichTextEditor
           ref={editorRef}
           placeholder="Leave a comment..."
@@ -38,7 +38,7 @@ function CommentInput({ onSubmit }: CommentInputProps) {
           debounceMs={100}
         />
       </div>
-      <div className="flex items-center justify-end border-t border-border/50 px-2 py-1.5">
+      <div className="absolute bottom-1.5 right-1.5">
         <Button
           size="icon-sm"
           disabled={isEmpty || submitting}

apps/web/features/issues/components/issue-detail.tsx

@@ -209,16 +209,23 @@ export function IssueDetail({ issueId, onDelete, defaultSidebarOpen = true, layo
   // Watch the global issue store for real-time updates from other users/agents
   const storeIssue = useIssueStore((s) => s.issues.find((i) => i.id === id));
 
+  const wasLoadedRef = useRef(false);
+
   useEffect(() => {
     if (storeIssue) {
+      wasLoadedRef.current = true;
       setIssue(storeIssue);
       if (!titleFocusedRef.current) {
         setTitleDraft(storeIssue.title);
       }
+    } else if (wasLoadedRef.current && !loading) {
+      // Issue was in the store but is now gone (deleted by another user)
+      setIssue(null);
     }
-  }, [storeIssue]);
+  }, [storeIssue, loading]);
 
   useEffect(() => {
+    wasLoadedRef.current = false;
     setIssue(null);
     setTitleDraft("");
     setTimeline([]);
@@ -461,8 +468,14 @@ export function IssueDetail({ issueId, onDelete, defaultSidebarOpen = true, layo
 
   if (!issue) {
     return (
-      <div className="flex flex-1 min-h-0 items-center justify-center text-sm text-muted-foreground">
-        Issue not found
+      <div className="flex flex-1 min-h-0 flex-col items-center justify-center gap-3 text-sm text-muted-foreground">
+        <p>This issue does not exist or has been deleted in this workspace.</p>
+        {!onDelete && (
+          <Button variant="outline" size="sm" onClick={() => router.push("/issues")}>
+            <ChevronLeft className="mr-1 h-3.5 w-3.5" />
+            Back to Issues
+          </Button>
+        )}
       </div>
     );
   }
@@ -856,9 +869,30 @@ export function IssueDetail({ issueId, onDelete, defaultSidebarOpen = true, layo
                   }
                 }
 
+                // Coalesce: same actor + same action within 2 min → keep last only
+                const COALESCE_MS = 2 * 60 * 1000;
+                const coalesced: TimelineEntry[] = [];
+                for (const entry of topLevel) {
+                  if (entry.type === "activity") {
+                    const prev = coalesced[coalesced.length - 1];
+                    if (
+                      prev?.type === "activity" &&
+                      prev.action === entry.action &&
+                      prev.actor_type === entry.actor_type &&
+                      prev.actor_id === entry.actor_id &&
+                      Math.abs(new Date(entry.created_at).getTime() - new Date(prev.created_at).getTime()) <= COALESCE_MS
+                    ) {
+                      // Replace previous with this one (keep the later result)
+                      coalesced[coalesced.length - 1] = entry;
+                      continue;
+                    }
+                  }
+                  coalesced.push(entry);
+                }
+
                 // Group consecutive activities together so the connector line works
                 const groups: { type: "activities" | "comment"; entries: TimelineEntry[] }[] = [];
-                for (const entry of topLevel) {
+                for (const entry of coalesced) {
                   if (entry.type === "activity") {
                     const last = groups[groups.length - 1];
                     if (last?.type === "activities") {

apps/web/features/issues/components/reply-input.tsx

@@ -34,7 +34,7 @@ function ReplyInput({
   const [submitting, setSubmitting] = useState(false);
 
   const handleSubmit = async () => {
-    const content = editorRef.current?.getMarkdown()?.trim();
+    const content = editorRef.current?.getMarkdown()?.replace(/(\n\s*)+$/, "").trim();
     if (!content || submitting) return;
     setSubmitting(true);
     try {