feat: add repo validation

src/lib/Repos.svelte

@@ -73,11 +73,14 @@
 			},
 			body: JSON.stringify({
 				id: repo.id.toString(),
-				name: repo.full_name
+				full_name: repo.full_name
 			})
 		});
+		const data = await response.json();
 		if (!response.ok) {
-			toast.warning('Repository already imported');
+			toast.warning(data.error);
+			adding = null;
+			return;
 		} else {
 			toast.success('Successfully added repository');
 		}