fix: discord send failure logs WARNING, not ERROR (D4)

_send mirrors the record to the stdlib sink BEFORE attempting the discord send, so a
swallowed send failure is recovered cleanly - the log survives, only the channel mirror
was lost. that is a WARNING (recovered), not an ERROR. demote from _log.exception (ERROR +
traceback) to _log.warning with the reason folded in lazily; the traceback belonged on a
terminal/unhandled path, and this one recovers via the guaranteed stdlib record.

Signed-off-by: disqualifier <dev@disqualifier.me>

src/dpy_logger/dpy_logger.py

@@ -213,8 +213,11 @@ class DPYLogger:
                 content=content,
                 embed=self.build_embed(level, action, actor, log_msg),
             )
-        except Exception:
-            _log.exception(f"[dpy_logger] failed to send {level} log: {log_msg}")
+        except Exception as exc:
+            # WARNING, not ERROR: the record was already mirrored to the stdlib sink BEFORE the
+            # send (see _emit_stdlib above), so a swallowed discord-send failure is recovered
+            # cleanly - the log survives, only the channel mirror was lost. lazy interpolation.
+            _log.warning("[dpy_logger] failed to send %s log: %s (%s)", level, log_msg, exc)
             return None
 
     async def debug(self, log, action=None, actor=None, guild=None, log_to_file=None):