feat: audio - add concurrent mixing, output switching, and device-aware UI

kernel/src/Sched/Scheduler.cpp

@@ -24,7 +24,6 @@
 #include <Api/Heap.hpp>
 #include <Api/LibSyscall.hpp>
 #include <Drivers/Audio/Mixer.hpp>
-#include <Drivers/USB/Bluetooth/A2dp.hpp>
 #include <Drivers/Graphics/IntelGPU.hpp>
 #include <Ipc/Ipc.hpp>
 
@@ -1241,11 +1240,6 @@ namespace Sched {
         // and its ring buffer don't leak when an app forgets to audio_close.
         Drivers::Audio::Mixer::CleanupProcess(exitingPid);
 
-        // Release the Bluetooth A2DP output if this process owned it, so a
-        // killed app cannot leave the output claimed forever (no-op when the
-        // process was not the owner).
-        Drivers::USB::Bluetooth::A2dp::ReleaseOutput(exitingPid);
-
         // Restore scanout to buffer 0 if the exiting process owned page
         // flips, so the next fullscreen client and the kernel terminal are
         // never stranded on the invisible buffer (no-op for non-owners).