fix: only append link with page attribute if metatada.page is available

src/lib/components/chat/Messages/CitationsModal.svelte

@@ -65,7 +65,7 @@
 									<a
 										class="hover:text-gray-500 hover:dark:text-gray-100 underline"
 										href={document?.metadata?.file_id
-											? `/api/v1/files/${document?.metadata?.file_id}/content#page=${document?.metadata?.page + 1}`
+											? `/api/v1/files/${document?.metadata?.file_id}/content${document?.metadata?.page !== undefined ? `#page=${document.metadata.page + 1}` : ''}`
 											: document.source.name.includes('http')
 												? document.source.name
 												: `#`}