feat(ui): unify comment assignee selector with icons and fix click flash

Add renderTriggerValue/renderOption to the comment thread's assignee
selector so it shows agent icons, matching the new issue dialog. Fix
the InlineEntitySelector flash on click by only auto-opening on
keyboard focus (not pointer-triggered focus).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ui/src/components/CommentThread.tsx

@@ -8,6 +8,7 @@ import { InlineEntitySelector, type InlineEntityOption } from "./InlineEntitySel
 import { MarkdownBody } from "./MarkdownBody";
 import { MarkdownEditor, type MarkdownEditorRef, type MentionOption } from "./MarkdownEditor";
 import { StatusBadge } from "./StatusBadge";
+import { AgentIcon } from "./AgentIconPicker";
 import { formatDateTime } from "../lib/utils";
 
 interface CommentWithRunMeta extends IssueComment {
@@ -385,6 +386,32 @@ export function CommentThread({
               emptyMessage="No assignees found."
               onChange={setReassignTarget}
               className="text-xs h-8"
+              renderTriggerValue={(option) => {
+                if (!option) return <span className="text-muted-foreground">Assignee</span>;
+                const agentId = option.id.startsWith("agent:") ? option.id.slice("agent:".length) : null;
+                const agent = agentId ? agentMap?.get(agentId) : null;
+                return (
+                  <>
+                    {agent ? (
+                      <AgentIcon icon={agent.icon} className="h-3.5 w-3.5 shrink-0 text-muted-foreground" />
+                    ) : null}
+                    <span className="truncate">{option.label}</span>
+                  </>
+                );
+              }}
+              renderOption={(option) => {
+                if (!option.id) return <span className="truncate">{option.label}</span>;
+                const agentId = option.id.startsWith("agent:") ? option.id.slice("agent:".length) : null;
+                const agent = agentId ? agentMap?.get(agentId) : null;
+                return (
+                  <>
+                    {agent ? (
+                      <AgentIcon icon={agent.icon} className="h-3.5 w-3.5 shrink-0 text-muted-foreground" />
+                    ) : null}
+                    <span className="truncate">{option.label}</span>
+                  </>
+                );
+              }}
             />
           )}
           <Button size="sm" disabled={!canSubmit} onClick={handleSubmit}>

ui/src/components/InlineEntitySelector.tsx

@@ -45,6 +45,7 @@ export const InlineEntitySelector = forwardRef<HTMLButtonElement, InlineEntitySe
     const [highlightedIndex, setHighlightedIndex] = useState(0);
     const inputRef = useRef<HTMLInputElement>(null);
     const shouldPreventCloseAutoFocusRef = useRef(false);
+    const isPointerDownRef = useRef(false);
 
     const allOptions = useMemo<InlineEntityOption[]>(
       () => [{ id: "", label: noneLabel, searchText: noneLabel }, ...options],
@@ -97,7 +98,11 @@ export const InlineEntitySelector = forwardRef<HTMLButtonElement, InlineEntitySe
               "inline-flex min-w-0 items-center gap-1 rounded-md border border-border bg-muted/40 px-2 py-1 text-sm font-medium text-foreground transition-colors hover:bg-accent/50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring",
               className,
             )}
-            onFocus={() => setOpen(true)}
+            onPointerDown={() => { isPointerDownRef.current = true; }}
+            onFocus={() => {
+              if (!isPointerDownRef.current) setOpen(true);
+              isPointerDownRef.current = false;
+            }}
           >
             {renderTriggerValue
               ? renderTriggerValue(currentOption)