Test frontend: niente piu' dipendenza dall'ordine sulla stazione (TieMeasureFlow#79)

test_measure.py non ricarica piu' config/blueprints.measure (monkeypatch.setattr,
annullato al teardown); TestTaskComplete e test_recipe_rules_ui.py fissano la
stazione esplicitamente con una fixture autouse.

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

src/frontend/flask_app/tests/test_recipe_rules_ui.py

@@ -6,6 +6,17 @@ a start button that will not start, a description that reads the way it was
 written.
 """
 
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def _no_station(monkeypatch):
+    # These tests assume no station is configured (e.g. _task_list feeds the mock a
+    # fixed number of replies, with no /production-runs/current among them); pin it
+    # so a STATION_CODE left behind by an earlier test cannot change the call count (#79).
+    # Tests that need a station set it themselves, after this fixture has run.
+    monkeypatch.setattr("blueprints.measure.Config.STATION_CODE", None)
+
 
 # ---------------------------------------------------------------------------
 # Point 11 - line breaks and bold, and nothing else
@@ -197,13 +208,9 @@ def test_avvia_is_untouched_when_nothing_is_required(
 def test_selection_screen_carries_the_traceability_rules(
     logged_in_client, mock_api_client, monkeypatch,
 ):
-    monkeypatch.setenv("STATION_CODE", "ST-TEST")
-    import importlib
-
-    import config
-    importlib.reload(config)
-    import blueprints.measure
-    importlib.reload(blueprints.measure)
+    # Patch instead of reload()ing config/blueprints.measure: the patch is undone at
+    # teardown, a reload would leave ST-TEST behind for later tests (#79).
+    monkeypatch.setattr("blueprints.measure.Config.STATION_CODE", "ST-TEST")
 
     mock_api_client.get_station_recipes.return_value = [
         {