fix(editor): version string, NPC ID reset, author attribution + UX

Bug fixes:
- Fix README.txt version from v0.8.0 to v1.0.0
- Reset NPC idCounter_ on loadFromFile to prevent ID collisions
- WCP content pack uses project author/description if loaded instead
  of hardcoded "Kelsi Davis"

New features:
- Select by Type: context menu items for "Select All M2 Models" and
  "Select All WMO Buildings" for batch type-based selection
- selectByType(PlaceableType) added to ObjectPlacer
- Export summary toast now shows object/NPC/quest counts alongside
  file count and open format score (5s duration)

tools/editor/object_placer.cpp

@@ -120,6 +120,17 @@ void ObjectPlacer::selectAll() {
     if (!objects_.empty()) selectedIdx_ = 0;
 }
 
+void ObjectPlacer::selectByType(PlaceableType type) {
+    clearSelection();
+    for (int i = 0; i < static_cast<int>(objects_.size()); i++) {
+        if (objects_[i].type == type) {
+            objects_[i].selected = true;
+            selectedIndices_.push_back(i);
+        }
+    }
+    if (!selectedIndices_.empty()) selectedIdx_ = selectedIndices_[0];
+}
+
 void ObjectPlacer::moveSelected(const glm::vec3& delta) {
     if (selectedIndices_.size() > 1) {
         for (int idx : selectedIndices_) objects_[idx].position += delta;