refactor: what counts as an event moves into its own evaluator, so a search can ask the same question the trigger asks

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ui.cpp

@@ -1609,12 +1609,12 @@ void publish_trigger_fields(App* app) {
   {
     std::lock_guard<std::mutex> lock(app->model->mutex());
     TriggerConfig& tc = app->model->trigger();
-    tc.level = level;
+    tc.condition.level = level;
     tc.pretrigger_pct = pre;
     tc.holdoff_s = holdoff;
-    tc.edge = edge == 0 ? TriggerEdge::Rising
-              : edge == 1 ? TriggerEdge::Falling
-                          : TriggerEdge::Both;
+    tc.condition.edge = edge == 0 ? TriggerEdge::Rising
+                        : edge == 1 ? TriggerEdge::Falling
+                                    : TriggerEdge::Both;
     tc.mode = mode == 0 ? TriggerMode::Normal : TriggerMode::Single;
   }
 }
@@ -2050,7 +2050,7 @@ void rebuild_trigger_signals(App& app) {
     if (std::isfinite(sig.range_min) && std::isfinite(sig.range_max) &&
         sig.range_max > sig.range_min) {
       const double mid = 0.5 * (sig.range_min + sig.range_max);
-      tc.level = mid;
+      tc.condition.level = mid;
       gtk_spin_button_set_value(GTK_SPIN_BUTTON(app.trigger_level_spin), mid);
     }
   }
@@ -6344,7 +6344,7 @@ gboolean tick(gpointer user) {
     span_s = model.partition().span_s;
     time_stride = model.partition().time_stride;
     const int chan = model.trigger().channel;
-    trigger_level = model.trigger().level;
+    trigger_level = model.trigger().condition.level;
     if (chan >= 0 && chan < static_cast<int>(model.channel_count())) {
       trigger_name = model.channels()[static_cast<std::size_t>(chan)].name;
     }
@@ -8270,7 +8270,8 @@ gboolean trigrenum_probe(gpointer user) {
                  "holdoff=%.4f level=%.4g edge=%d mode=%d enabled=%d armed=%d ch=%d "
                  "channels=%zu\n",
                  a->rows->time_window(), a->model->event_span(), tc.pretrigger_pct,
-                 tc.post_span_s(a->model->event_span()), tc.holdoff_s, tc.level, int(tc.edge),
+                 tc.post_span_s(a->model->event_span()), tc.holdoff_s, tc.condition.level,
+                 int(tc.condition.edge),
                  int(tc.mode), int(tc.enabled), int(tc.armed), tc.channel,
                  a->model->channel_count());
   }
@@ -8295,7 +8296,7 @@ gboolean fields_probe(gpointer user) {
   std::lock_guard<std::mutex> lock(a->model->mutex());
   std::fprintf(stderr, "[fields-probe] mode=%u edge=%u published mode=%d edge=%d capturing=%d\n",
                gtk_drop_down_get_selected(mode), gtk_drop_down_get_selected(edge),
-               int(a->model->trigger().mode), int(a->model->trigger().edge),
+               int(a->model->trigger().mode), int(a->model->trigger().condition.edge),
                int(a->model->trigger_pending()));
   std::fflush(stderr);
   return G_SOURCE_REMOVE;