Fix carpet sliding and brighten WMO interiors 10%

- Carpet slide fix: use raw model bounds (rawMax.z) instead of radius-
  inflated effectiveTop for the on-top-of-object check, so thin objects
  like rugs correctly skip lateral push
- Brighten WMO interior vertex lighting from 2.2/0.3 to 2.4/0.35

src/rendering/m2_renderer.cpp

@@ -2398,7 +2398,7 @@ bool M2Renderer::checkCollision(const glm::vec3& from, const glm::vec3& to,
         if (allowEscapeRelax) {
             continue;
         }
-        if (stepableLowObject && nearTop) {
+        if (stepableLowObject && localFrom.z >= rawMax.z - 0.35f) {
             // Already on/near top surface: don't apply lateral push that ejects
             // the player from the object (carpets, platforms, etc).
             continue;