feat(gui): log fichier rotatif V6 à chemin connu (E1)

tests/unit/test_gui_v6_logging_setup.py

@@ -0,0 +1,16 @@
+import logging
+
+
+def test_setup_file_logging_writes_to_known_path(tmp_path, monkeypatch):
+    monkeypatch.setenv("LOCALAPPDATA", str(tmp_path))
+    from gui_v6.logging_setup import setup_file_logging, _reset_for_tests
+
+    try:
+        log_path = setup_file_logging()
+        assert log_path.parent.exists()
+        logging.getLogger("test.e1").warning("ligne-temoin-42")
+        for h in logging.getLogger().handlers:
+            h.flush()
+        assert "ligne-temoin-42" in log_path.read_text(encoding="utf-8")
+    finally:
+        _reset_for_tests()