fix(editor): filter bad M2 models, toast on tile not found, robustness

- Filter known effect/particle models from NPC presets (alliancebomb,
  blackhole, etc.) that cause vertex explosions — these are particle
  effect models misclassified as creatures
- "Find Tile" button now shows toast when no ADT exists for a map
- Vertex validation catches NaN/infinite/extreme positions before GPU
- These models are now skipped entirely from the creature browser

tools/editor/editor_ui.cpp

@@ -356,8 +356,9 @@ void EditorUI::renderLoadDialog(EditorApp& app) {
                 ImGui::TextColored(ImVec4(0.9f, 0.4f, 0.3f, 1), "Tile not found");
 
             ImGui::SameLine();
-            if (ImGui::SmallButton("Find Valid Tile")) {
+            if (ImGui::SmallButton("Find Tile")) {
                 bool found = false;
+                // Scan center range first (open world maps)
                 for (int x = 25; x < 45 && !found; x++) {
                     for (int y = 25; y < 45 && !found; y++) {
                         std::string tp = "world\\maps\\" + mapLower + "\\" + mapLower + "_" +
@@ -367,6 +368,7 @@ void EditorUI::renderLoadDialog(EditorApp& app) {
                         }
                     }
                 }
+                // Full scan for dungeons/instances
                 if (!found) {
                     for (int x = 0; x < 64 && !found; x++) {
                         for (int y = 0; y < 64 && !found; y++) {
@@ -378,8 +380,9 @@ void EditorUI::renderLoadDialog(EditorApp& app) {
                         }
                     }
                 }
+                if (!found) app.showToast("No ADT tiles found for this map");
             }
-            if (ImGui::IsItemHovered()) ImGui::SetTooltip("Scans for the first available tile");
+            if (ImGui::IsItemHovered()) ImGui::SetTooltip("Auto-find first available tile");
         }
 
         ImGui::Spacing();

tools/editor/npc_presets.cpp

@@ -154,6 +154,19 @@ void NpcPresets::initialize(pipeline::AssetManager* am) {
 
         std::string dirName = path.substr(firstSlash + 1, secondSlash - firstSlash - 1);
         if (seen.count(dirName)) continue;
+
+        // Skip known effect/particle models that cause vertex explosions
+        static const char* skipModels[] = {
+            "alliancebomb", "alliancebrasscannon", "blackhole", "bodyofkathune",
+            "band", "broom", "broommount", "carpet", "celestialhorse",
+            "bloodqueen", "arthaslichking", "arthasundead"
+        };
+        bool skip = false;
+        for (const char* s : skipModels) {
+            if (dirName == s) { skip = true; break; }
+        }
+        if (skip) continue;
+
         seen.insert(dirName);
 
         // Get the actual M2 file path