engine: the row's countdown is set the moment a watchdog restart is scheduled; injector reads the rung over two seconds

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
(cherry picked from commit 887006768d)

app/igneum-app/src/engine.rs

@@ -4307,6 +4307,7 @@ impl Engine {
                     c.restarts = self.miners[i].restarts;
                     c.hash_now = 0.0;
                     c.pid = 0;
+                    c.restart_in_s = delay_s;
                     c.message = format!("{reason}; trying again");
                 }
             }