refactor: simplify audio volume handling in AudioVolumeField (#3246)

firmware/application/ui/ui_receiver.cpp

@@ -26,10 +26,7 @@
 #include "string_format.hpp"
 #include "ui_receiver.hpp"
 #include "ui_freqman.hpp"
-
-#ifndef PRALINE
 #include "audio.hpp"
-#endif
 
 using namespace portapack;
 
@@ -595,18 +592,13 @@ AudioVolumeField::AudioVolumeField(
           /* fill char */ ' '} {
     set_value(receiver_model.normalized_headphone_volume());
 
-#ifdef PRALINE
-    on_change = [](int32_t v) {
-        receiver_model.set_normalized_headphone_volume(v);
-#else
     on_change = [](int32_t vol) {
-        // don't call receiver model, because this widget shuld be able to handle volume settinsg from any app, regardless of the receiver model's enables state. like the tx apps should be able to set volume too.
+        // Don't call receiver_model here so volume can be adjusted even when ReceiverModel is disabled (e.g. TX apps/games).
-        // this is identical to the receiver model's method
+        // The dB mapping mirrors ReceiverModel::set_normalized_headphone_volume().
         uint8_t v = clip<uint8_t>(vol, 0, 99);
         auto new_volume = volume_t::decibel(v - 99) + audio::headphone::volume_range().max;
         persistent_memory::set_headphone_volume(new_volume);
         audio::headphone::set_volume(new_volume);
-#endif
     };
 }