Add windeployqt post-build step for automatic Qt DLL deployment on Windows

tools/chatgui/CMakeLists.txt

@@ -85,6 +85,17 @@ target_compile_definitions(chatgui PRIVATE SQLITE_THREADSAFE=1 USE_SQLITE)
 set_source_files_properties(db/sqlite3.c transport/chat_core.c transport/chat_sync.c transport/db_sync_stub.c PROPERTIES LANGUAGE C)
 if(WIN32)
     target_link_libraries(chatgui PRIVATE ${QT_LIBS} rlottie::rlottie ZLIB::ZLIB OpenSSL::Crypto ZXing::ZXing utun pthread)
+    if(Qt6_FOUND)
+        find_program(WINDEPLOYQT windeployqt6 HINTS ${Qt6_DIR}/../../../bin)
+    else()
+        find_program(WINDEPLOYQT windeployqt HINTS ${Qt5_DIR}/../../../bin)
+    endif()
+    if(WINDEPLOYQT)
+        add_custom_command(TARGET chatgui POST_BUILD
+            COMMAND ${WINDEPLOYQT} --no-translations $<TARGET_FILE:chatgui>
+            COMMENT "Deploying Qt DLLs alongside executable..."
+        )
+    endif()
 else()
     target_link_libraries(chatgui PRIVATE ${QT_LIBS} rlottie::rlottie ZLIB::ZLIB OpenSSL::Crypto ZXing::ZXing utun pthread dl)
 endif()