Add MCLQ water, TaxiPathNode transports, and vanilla M2 particles

- Parse MCLQ sub-chunks in vanilla ADTs for water rendering (WotLK uses MH2O)
- Load TaxiPathNode.dbc for MO_TRANSPORT world-coordinate paths (vanilla boats)
- Parse data[] from SMSG_GAMEOBJECT_QUERY_RESPONSE (taxiPathId for transports)
- Support vanilla M2 particle emitters (504-byte struct, different from WotLK 476)
- Add character preview texture diagnostic logging
- Fix disconnect handling on character screen (show error only when no chars)

src/rendering/character_preview.cpp

@@ -223,11 +223,20 @@ bool CharacterPreview::loadCharacter(game::Race race, game::Gender gender,
                 foundUnderwear = true;
             }
         }
+
+        LOG_INFO("CharSections lookup: skin=", foundSkin ? bodySkinPath_ : "(not found)",
+                 " face=", foundFace ? (faceLowerPath.empty() ? "(empty)" : faceLowerPath) : "(not found)",
+                 " hair=", foundHair ? (hairScalpPath.empty() ? "(empty)" : hairScalpPath) : "(not found)",
+                 " underwear=", foundUnderwear, " (", underwearPaths.size(), " textures)");
+    } else {
+        LOG_WARNING("CharSections.dbc not loaded — no character textures");
     }
 
     // Assign texture filenames on model before GPU upload
     for (size_t ti = 0; ti < model.textures.size(); ti++) {
         auto& tex = model.textures[ti];
+        LOG_INFO("  Model texture[", ti, "]: type=", tex.type,
+                 " filename='", tex.filename, "'");
         if (tex.type == 1 && tex.filename.empty() && !bodySkinPath_.empty()) {
             tex.filename = bodySkinPath_;
         } else if (tex.type == 6 && tex.filename.empty() && !hairScalpPath.empty()) {