Address chat source annotation review nits

apps/web/components/chat/message/agent-message.tsx

@@ -303,12 +303,14 @@ function makeMarkdownComponents(
 	return {
 		a: ({ href, children }: { href?: string; children?: ReactNode }) => {
 			if (href?.startsWith("#sm-source:")) {
-				let sourceId = ""
-				try {
-					sourceId = decodeURIComponent(href.slice("#sm-source:".length))
-				} catch {
-					return <>{children}</>
-				}
+				const sourceId = (() => {
+					try {
+						return decodeURIComponent(href.slice("#sm-source:".length))
+					} catch {
+						return null
+					}
+				})()
+				if (!sourceId) return <>{children}</>
 				return (
 					<SourceCitationLink
 						sourceId={sourceId}

apps/web/lib/chat-memory-tools.ts

@@ -290,9 +290,9 @@ export async function fetchDocumentsByIds(
 			data?: { documents?: DocumentWithMemories[] } | null
 		}
 		if (result.error) {
-			throw new Error(
-				result.error.message ?? "Failed to fetch source documents",
-			)
+			throw new Error("Failed to fetch source documents", {
+				cause: result.error,
+			})
 		}
 		return result.data?.documents ?? []
 	}