feat(chat): render timestamp under assistant messages and reuse shared formatter

surfsense_web/components/assistant-ui/assistant-message.tsx

@@ -35,6 +35,7 @@ import {
 	useAllCitationMetadata,
 } from "@/components/assistant-ui/citation-metadata-context";
 import { MarkdownText } from "@/components/assistant-ui/markdown-text";
+import { MessageTimestamp } from "@/components/assistant-ui/message-timestamp";
 import { ReasoningMessagePart } from "@/components/assistant-ui/reasoning-message-part";
 import { RevertTurnButton } from "@/components/assistant-ui/revert-turn-button";
 import {
@@ -62,6 +63,7 @@ import { withArtifactAnchor } from "@/features/chat-artifacts";
 import { useComments } from "@/hooks/use-comments";
 import { useMediaQuery } from "@/hooks/use-media-query";
 import { useElectronAPI } from "@/hooks/use-platform";
+import { formatMessageTimestamp } from "@/lib/format-date";
 import { getProviderIcon } from "@/lib/provider-icons";
 import { tryGetHostname } from "@/lib/url";
 import { cn } from "@/lib/utils";
@@ -249,16 +251,6 @@ export const MessageError: FC = () => {
 	);
 };
 
-function formatMessageDate(date: Date): string {
-	return date.toLocaleDateString(undefined, {
-		month: "short",
-		day: "numeric",
-		hour: "numeric",
-		minute: "2-digit",
-		hour12: true,
-	});
-}
-
 /**
  * Format provider USD cost (in micro-USD) for inline display next to a
  * token count. Falls back to ``"<$0.001"`` for sub-tenth-of-a-cent
@@ -367,7 +359,7 @@ const MessageInfoDropdown: FC<{ chatTurnId: string | null | undefined }> = ({ ch
 			>
 				{createdAt && (
 					<DropdownMenuLabel className="text-xs text-muted-foreground font-normal select-none">
-						{formatMessageDate(createdAt)}
+						{formatMessageTimestamp(createdAt)}
 					</DropdownMenuLabel>
 				)}
 				{hasUsage && (
@@ -463,6 +455,8 @@ const AssistantMessageInner: FC = () => {
 				<MessageError />
 			</div>
 
+			<MessageTimestamp className="ml-2 mt-2" />
+
 			{isMobile && (
 				<div className="ml-2 mt-2">
 					<MobileCitationDrawer />