feat: the status bar and the exit dump report resequencing, holes and stale packets

src/status_text.hpp

@@ -56,6 +56,16 @@ struct StatusSnapshot {
   /// the plot.
   bool paused = false;
   double paused_for_s = 0.0;
+
+  /// The resequencing counters, gathered with `packets`/`frames`/`gaps` so the detail tier and
+  /// the dump quote one consistent set. All six zero means the stream never lost ordering, and
+  /// the detail tier then says nothing about it at all.
+  std::uint64_t resequenced = 0;
+  std::uint64_t late = 0;
+  std::uint64_t stale = 0;
+  std::uint64_t holes = 0;
+  std::uint64_t hole_slots = 0;
+  std::uint64_t backfilled = 0;
 };
 
 /// The bar: "live · 10 kS/s · 2 s window", plus " · event 4.2 s ago" in trigger mode, " · for