Add a macro recorder: record a task by hand, for an assistant to script

Projet > Scripts > Enregistrer une macro (also in command search and the
shortcut bar) records what is done on the current project until clicked
again. Under <data folder>/recordings/<id>/ it saves the whole project
before and after, the folio and selection at the start, and each step from
the undo history -- its name, the commands inside it, the folio, what was
selected, and the folio after it. No editing command is taught to the
recorder, and nothing new walks the scene: the files are QElectroTech's
own serialisation.

While recording, the status bar shows "● Enregistrement : N étapes" with
Arrêter. At the end a box says where it went and offers "Copier la demande
pour l'assistant": a ready-made request naming the recording, to paste
into the assistant's chat, since QElectroTech cannot send it anything
itself. qet-assistant.json lists the recordings, and live status says
whether one is under way and which was last.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

cmake/qet_compilation_vars.cmake

@@ -930,6 +930,8 @@ list(APPEND QET_SRC_FILES
   ${QET_DIR}/sources/scripting/scriptmanagerdialog.h
   ${QET_DIR}/sources/scripting/liveserver.cpp
   ${QET_DIR}/sources/scripting/liveserver.h
+  ${QET_DIR}/sources/scripting/macrorecorder.cpp
+  ${QET_DIR}/sources/scripting/macrorecorder.h
   ${QET_DIR}/sources/scripting/assistantinfo.cpp
   ${QET_DIR}/sources/scripting/assistantinfo.h
 )