boot Pokopia past audio init (Switch 2 heap limits, aud:u 1, stpl:u) (#77)

* game_list: don't free the worker while it is processing events

OnPopulatingCompleted runs a nested event loop from inside
GameListWorker::ProcessEvents. If the directory watcher fires there, the
repopulate destroys the worker while ProcessEvents is still on the stack
and the next lock hits a freed mutex. Stop the worker synchronously but
free it with deleteLater, and stop ProcessEvents once it has been
replaced.

Assisted-by: Claude Opus 5.5 (code changes, debugging and commit message)

* Fix Switch 2 heap limits and game list reloads during emulation

- SetHeapSize rejected heaps of 8 GiB or more (Switch 1's MainMemorySizeMax),
  so Switch 2 titles that size their heap from the 12 GiB layout (Pokopia
  asks for 9.5 GiB) got ResultInvalidSize and aborted with 2001-0101. Allow
  up to the memory the active layout provides.
- Grow the 39-bit heap region from 8 to 16 GiB so such a heap fits.
- Skip watcher-driven game list reloads while a game runs: Repopulate calls
  CreateFactories, which replaces content providers the running game reads
  (segfault in ContentProviderUnion::GetEntry). Stopping emulation already
  repopulates the list.

Assisted-by: Claude Opus 5.5 (code changes, debugging and commit message)

* nx2: answer aud:u 1 with an IAudioOutManager

nn::audio::OpenAudioOut gets its manager from aud:u command 1 and calls
OpenAudioOut through slot 1 of the returned object. The auto stub
returned no object, so Pokopia jumped through a null vtable 5 s into boot
and never got past its first frame.

Assisted-by: Claude Opus 5.5 (code changes, debugging and commit message)

* nx2: add a stpl:u (stream play) stub with a user service

nn::streamplay::detail::GetUserService opens a session with stpl:u 0
and attaches a system event to the handle command 300 returns. The
generic missing-service stub returned no session, so Pokopia's first
nn::streamplay call jumped through null right after audio setup.

Assisted-by: Claude Opus 5.5 (code changes, debugging and commit message)

1 files changed, 9 insertions, 3 deletions

diff --git a/src/qt_common/game_list/worker.cpp b/src/qt_common/game_list/worker.cpp
index 14afe2f276..d18f84089a 100644
--- a/src/qt_common/game_list/worker.cpp
+++ b/src/qt_common/game_list/worker.cpp
@@ -313,12 +313,18 @@ GameListWorker::GameListWorker(FileSys::VirtualFilesystem vfs_,
 
 GameListWorker::~GameListWorker() {
     this->disconnect();
-    stop_requested.store(true);
-    processing_completed.Wait();
+    Stop();
+}
+
+void GameListWorker::Stop() {
+    if (!stop_requested.exchange(true)) {
+        processing_completed.Wait();
+    }
 }
 
 void GameListWorker::ProcessEvents(GameListModel* model) {
-    while (true) {
+    // An event may spin a nested event loop that replaces this worker, in which case stop.
+    while (model->current_worker.get() == this) {
         std::function<void(GameListModel*)> func;
         {
             // Lock queue to protect concurrent modification.