fix(leakage): accept display flow units

tests/unit/test_leakage_flow_units.py

@@ -0,0 +1,20 @@
+import pytest
+
+from app.algorithms.leakage.identifier import LeakageIdentifier
+
+
+@pytest.mark.parametrize(
+    ("unit", "expected"),
+    [
+        ("m3/s", 1.0),
+        ("m³/s", 1.0),
+        ("m3/h", 3600.0),
+        ("m³/h", 3600.0),
+    ],
+)
+def test_leakage_identifier_accepts_display_flow_units(unit, expected):
+    assert LeakageIdentifier._flow_from_m3s(1.0, unit) == expected
+
+
+def test_leakage_identifier_accepts_display_flow_units_for_input():
+    assert LeakageIdentifier._flow_to_m3s(3600.0, "m³/h") == 1.0