Merge branch 'main' into claude/inspiring-knuth-7cp6pk-upstream

Conflicts were only in include lists (CadDocument.cpp, SketchEngine.cpp);
both sides' includes are kept.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QK4VgguuCAk2hZLWgcjJb9

src/slic3r/GUI/MainFrame.cpp

@@ -3929,6 +3929,8 @@ bool MainFrame::load_config_file(const std::string &path)
         return false;
     }
     wxGetApp().load_current_presets();
+    if (Plater *plater = wxGetApp().plater())
+        plater->normalize_bed_types(false);
     return true;
 }