[ui] format ADDED attr

webui/src/components/widgets/Table.svelte

@@ -153,6 +153,7 @@
     FILE_MIME: "MIME type",
     FILE_MTIME: "Last modified",
     FILE_SIZE: "File size",
+    ADDED: "Added at",
   };
 
   const VALUE_FORMATTERS: { [key: string]: (val: string | number) => string } =
@@ -160,6 +161,7 @@
       FILE_MTIME: (val) =>
         format(fromUnixTime(parseInt(String(val), 10)), "PPpp"),
       FILE_SIZE: (val) => filesize(parseInt(String(val), 10), { base: 2 }),
+      ADDED: (val) => format(fromUnixTime(parseInt(String(val), 10)), "PPpp"),
     };
 
   function formatAttribute(attribute: string) {