Include what the IMEX code uses

Upstream's clang-tidy gate now checks that the lines a pull request changes
include the header for every symbol they use. The IMEX sources, their tests,
and the lines this PR adds to shared files relied on the precompiled header and
transitive includes. This adds the includes clang-tidy names; no code changes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/slic3r/GUI/IMEXModesCtrl.cpp

@@ -1,12 +1,28 @@
 #include "slic3r/GUI/IMEXModesCtrl.hpp"
 
+#include <wx/anybutton.h>
+#include <libslic3r/IMEXHelpers.hpp>
+#include <cstddef>
+#include <vector>
+#include <tuple>
+#include <libslic3r/Config.hpp>
+#include <map>
+#include <string>
+#include <optional>
+#include <functional>
 #include <wx/app.h>
+#include <wx/event.h>
+#include <wx/colour.h>
 #include <wx/font.h>
+#include <wx/panel.h>
+#include <wx/sizer.h>
+#include <wx/gdicmn.h>
 #include <wx/stattext.h>
 
 #include <algorithm>
 #include <boost/algorithm/string/predicate.hpp>
 #include <utility>
+#include <wx/string.h>
 
 #include "slic3r/GUI/EditGCodeDialog.hpp"
 #include "slic3r/GUI/GUI.hpp"