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/game/game_handler.cpp

@@ -11435,6 +11435,15 @@ void GameHandler::unstuckGy() {
     }
 }
 
+void GameHandler::unstuckHearth() {
+    if (unstuckHearthCallback_) {
+        unstuckHearthCallback_();
+        addSystemChatMessage("Unstuck: teleported to hearthstone location.");
+    } else {
+        addSystemChatMessage("No hearthstone bind point set.");
+    }
+}
+
 void GameHandler::handleLootResponse(network::Packet& packet) {
     if (!LootResponseParser::parse(packet, currentLoot)) return;
     lootWindowOpen = true;