address bot comments

esphome/core/helpers.h

@@ -2235,11 +2235,12 @@ template<class T> struct PlacementStorage {
   /// @brief Raw byte storage, strictly aligned for type T.
   alignas(T) unsigned char data[sizeof(T)];
 
-  /// @brief Retrieves a pointer to the constructed object.
-  T *get() { return std::launder(reinterpret_cast<T *>(data)); }
+  /// @brief Retrieves a pointer to the storage as the target type.
+  /// The caller must ensure the object has been constructed via placement new before dereferencing.
+  T *get() { return reinterpret_cast<T *>(data); }
 
-  /// @brief Retrieves a const pointer to the constructed object.
-  const T *get() const { return std::launder(reinterpret_cast<const T *>(data)); }
+  /// @brief Retrieves a const pointer to the storage as the target type.
+  const T *get() const { return reinterpret_cast<const T *>(data); }
 };
 
 /// @name Internal functions

tests/component_tests/mipi_dsi/test_mipi_dsi_config.py

@@ -118,6 +118,10 @@ def test_code_generation(
     """Test code generation for display."""
 
     main_cpp = generate_main(component_fixture_path("mipi_dsi.yaml"))
+    assert (
+        "static esphome::PlacementStorage<mipi_dsi::MIPI_DSI> p4_nano_storage_;"
+        in main_cpp
+    )
     assert (
         "static mipi_dsi::MIPI_DSI *const p4_nano = p4_nano_storage_.get();" in main_cpp
     )