Remove min by shift type boundaries, improve logging, add more tests, add logs in tests, move fixtures in separate file, move restrictions_violated logic into valid_residents of next slot

src-tauri/src/slot.rs

@@ -45,7 +45,7 @@ impl Slot {
                 day: self.day,
                 position: ShiftPosition::Second,
             },
-            _ => Self {
+            ShiftPosition::First | ShiftPosition::Second => Self {
                 day: self.day.next(),
                 position: ShiftPosition::First,
             },