improve end reason in list ui

* in backend, save the full reason, not just the most direct error,
  which is often the useless `UNKNOWN`

* in UI, instead of wrapping in `<Typography>` which just resorts in
  a weird ransom-note mixed size look, reserve space for or actually
  use an icon.

server/src/streamer.rs

@@ -204,7 +204,7 @@ where
             let frame = match frame {
                 Ok(f) => f,
                 Err(e) => {
-                    let _ = w.close(None, Some(e.to_string()));
+                    let _ = w.close(None, Some(e.chain().to_string()));
                     return Err(e);
                 }
             };