feat(config): add temporary logging for failed reloads

- Add tmpLogBuf and tmpLog fields to capture config loading logs
  - Flush temporary logs only when reload succeeds
  - Extract NewLogger function for creating custom loggers
  - Update State interface to include FlushTmpLog method

internal/config/events.go

@@ -45,6 +45,9 @@ func Load() error {
 		notifyError("init", err)
 	}
 	SetState(state)
+
+	// flush temporary log
+	state.FlushTmpLog()
 	return nil
 }
 
@@ -69,6 +72,9 @@ func Reload() gperr.Error {
 		return gperr.New(ansi.Warning("using last config")).With(err)
 	}
 
+	// flush temporary log
+	newState.FlushTmpLog()
+
 	// cancel all current subtasks -> wait
 	// -> replace config -> start new subtasks
 	GetState().Task().FinishAndWait(config.ErrConfigChanged)