Move set_supported_custom_* out of traits() hot path

- Midea: frost protection preset now set once in on_status_change()
  when autoconf completes, guarded by a flag
- BedJet: custom fan modes and presets moved from traits() to setup()
- Test fixture: use has_custom_fan_mode() instead of nullptr check

esphome/components/bedjet/climate/bedjet_climate.cpp

@@ -61,6 +61,15 @@ void BedJetClimate::dump_config() {
 }
 
 void BedJetClimate::setup() {
+  // Set custom modes once during setup — stored on Climate base class, wired via get_traits()
+  this->set_supported_custom_fan_modes(BEDJET_FAN_STEP_NAMES);
+  this->set_supported_custom_presets({
+      this->heating_mode_ == HEAT_MODE_EXTENDED ? "LTD HT" : "EXT HT",
+      "M1",
+      "M2",
+      "M3",
+  });
+
   // restore set points
   auto restore = this->restore_state_();
   if (restore.has_value()) {

esphome/components/bedjet/climate/bedjet_climate.h

@@ -48,16 +48,8 @@ class BedJetClimate : public climate::Climate, public BedJetClient, public Polli
         // Climate doesn't have a "TURBO" mode, but we can use the BOOST preset instead.
         climate::CLIMATE_PRESET_BOOST,
     });
-    // Custom fan modes and presets are stored on Climate base class and wired via get_traits()
-    // It would be better if we had a slider for the fan modes.
-    this->set_supported_custom_fan_modes(BEDJET_FAN_STEP_NAMES);
-    // String literals are stored in rodata and valid for program lifetime
-    this->set_supported_custom_presets({
-        this->heating_mode_ == HEAT_MODE_EXTENDED ? "LTD HT" : "EXT HT",
-        "M1",
-        "M2",
-        "M3",
-    });
+    // Custom fan modes and presets are set once in setup(), stored on Climate base class,
+    // and wired automatically via get_traits()
     traits.set_visual_min_temperature(19.0);
     traits.set_visual_max_temperature(43.0);
     traits.set_visual_temperature_step(1.0);

esphome/components/midea/air_conditioner.cpp

@@ -24,6 +24,12 @@ template<typename T> void update_property(T &property, const T &value, bool &fla
 }
 
 void AirConditioner::on_status_change() {
+  // Set frost protection custom preset once when autoconf completes
+  if (this->base_.getAutoconfStatus() == dudanov::midea::AUTOCONF_OK &&
+      this->base_.getCapabilities().supportFrostProtectionPreset() && !this->frost_protection_set_) {
+    this->set_supported_custom_presets({Constants::FREEZE_PROTECTION});
+    this->frost_protection_set_ = true;
+  }
   bool need_publish = false;
   update_property(this->target_temperature, this->base_.getTargetTemp(), need_publish);
   update_property(this->current_temperature, this->base_.getIndoorTemp(), need_publish);
@@ -99,8 +105,6 @@ ClimateTraits AirConditioner::traits() {
   traits.add_supported_fan_mode(ClimateFanMode::CLIMATE_FAN_HIGH);
   if (this->base_.getAutoconfStatus() == dudanov::midea::AUTOCONF_OK) {
     Converters::to_climate_traits(traits, this->base_.getCapabilities());
-    if (this->base_.getCapabilities().supportFrostProtectionPreset())
-      this->set_supported_custom_presets({Constants::FREEZE_PROTECTION});
   }
   if (!traits.get_supported_modes().empty())
     traits.add_supported_mode(ClimateMode::CLIMATE_MODE_OFF);

esphome/components/midea/air_conditioner.h

@@ -55,6 +55,7 @@ class AirConditioner : public ApplianceBase<dudanov::midea::ac::AirConditioner>,
   ClimateModeMask supported_modes_{};
   ClimateSwingModeMask supported_swing_modes_{};
   ClimatePresetMask supported_presets_{};
+  bool frost_protection_set_{false};
   Sensor *outdoor_sensor_{nullptr};
   Sensor *humidity_sensor_{nullptr};
   Sensor *power_sensor_{nullptr};

tests/integration/fixtures/external_components/legacy_climate_component/climate/legacy_climate.h

@@ -44,10 +44,10 @@ class LegacyClimate : public climate::Climate, public Component {
     if (call.get_target_temperature().has_value()) {
       this->target_temperature = *call.get_target_temperature();
     }
-    if (call.get_custom_fan_mode() != nullptr) {
+    if (call.has_custom_fan_mode()) {
       this->set_custom_fan_mode_(call.get_custom_fan_mode());
     }
-    if (call.get_custom_preset() != nullptr) {
+    if (call.has_custom_preset()) {
       this->set_custom_preset_(call.get_custom_preset());
     }
     this->publish_state();