Fix shutdown hangs, bank bag icons/drag-drop, loading screen progress, and login spawn

- Fix shutdown hang: skip vmaDestroyAllocator (walked thousands of allocations),
  replace unsafe pthread_timedjoin_np with plain join + early-exit checks in workers
- Bank window: full icon rendering, click-and-hold pickup (0.10s), drag-drop for
  all bank slots including bank bag equip slots, same-slot drop detection
- Loading screen: process one tile per frame for live progress updates
- Camera reset: trust server position in online mode to avoid spawning under WMOs
- Fix PLAYER_BYTES/PLAYER_BYTES_2 field indices, preserve purchasedBankBagSlots
  across inventory rebuilds, fix bank slot purchase result codes

src/core/window.cpp

@@ -94,19 +94,22 @@ bool Window::initialize() {
 }
 
 void Window::shutdown() {
+    LOG_WARNING("Window::shutdown - vkContext...");
     if (vkContext) {
         vkContext->shutdown();
         vkContext.reset();
     }
 
+    LOG_WARNING("Window::shutdown - SDL_DestroyWindow...");
     if (window) {
         SDL_DestroyWindow(window);
         window = nullptr;
     }
 
+    LOG_WARNING("Window::shutdown - SDL_Quit...");
     SDL_Vulkan_UnloadLibrary();
     SDL_Quit();
-    LOG_INFO("Window shutdown complete");
+    LOG_WARNING("Window shutdown complete");
 }
 
 void Window::pollEvents() {