fix(parsing): correct UPDATE_OBJECT PackedGuid, cape textures, and missing asset guards

- Fix MOVEMENT update type to use readPackedGuid() instead of readUInt64() (WotLK 3.3.5a)
- Add desync diagnostic logging to UPDATE_OBJECT parser for future debugging
- Register MSG_MOVE_SET_COLLISION_HGT (0x518) as skip handler
- Fix cape texture lookup to only try .blp extension variants (4 files)
- Add fileExists() guards for underwear textures referencing missing BLP files (4 files)
- Add spell visual impact→cast M2 path fallback
- Skip WMO doodad instance creation when model load fails
- Demote spell caster position warning to debug level

src/rendering/terrain_manager.cpp

@@ -1055,7 +1055,12 @@ bool TerrainManager::advanceFinalization(FinalizingTile& ft) {
             size_t uploaded = 0;
             while (ft.wmoDoodadIndex < pending->wmoDoodads.size() && uploaded < kDoodadsPerStep) {
                 auto& doodad = pending->wmoDoodads[ft.wmoDoodadIndex];
-                if (m2Renderer->loadModel(doodad.model, doodad.modelId)) {
+                if (!m2Renderer->loadModel(doodad.model, doodad.modelId)) {
+                    ft.wmoDoodadIndex++;
+                    uploaded++;
+                    continue;
+                }
+                {
                     std::lock_guard<std::mutex> lock(uploadedM2IdsMutex_);
                     uploadedM2Ids_.insert(doodad.modelId);
                 }