Fix WMO wall collision, normal mapping, POM backfill, and M2/WMO rendering performance

- Fix MOPY flag check (0x08 not 0x01) for proper wall collision detection
- Cap MAX_PUSH to PLAYER_RADIUS to prevent gradual clip-through
- Fix WMO doodad quaternion component ordering (X/Y swap)
- Linear normal map strength blend in shader for smooth slider control
- Enable shadow sampling for interior WMO groups (covered outdoor areas)
- Backfill deferred normal/height maps after streaming with descriptor rebind
- M2: prepareRender only iterates animated instances, bone dirty flag
- M2: remove worker thread VMA allocation, skip unready bone instances
- WMO: persistent visibility vectors, sequential culling
- Add FSR EASU/RCAS shaders

src/core/window.cpp

@@ -84,6 +84,7 @@ bool Window::initialize() {
 
     // Initialize Vulkan context
     vkContext = std::make_unique<rendering::VkContext>();
+    vkContext->setVsync(vsync);
     if (!vkContext->initialize(window)) {
         LOG_ERROR("Failed to initialize Vulkan context");
         return false;
@@ -158,11 +159,13 @@ void Window::setFullscreen(bool enable) {
     }
 }
 
-void Window::setVsync([[maybe_unused]] bool enable) {
-    // VSync in Vulkan is controlled by present mode (set at swapchain creation)
-    // For now, store the preference — applied on next swapchain recreation
+void Window::setVsync(bool enable) {
     vsync = enable;
-    LOG_INFO("VSync preference set to ", enable ? "on" : "off", " (applied on swapchain recreation)");
+    if (vkContext) {
+        vkContext->setVsync(enable);
+        vkContext->markSwapchainDirty();
+    }
+    LOG_INFO("VSync ", enable ? "enabled" : "disabled");
 }
 
 void Window::applyResolution(int w, int h) {