[BREAKING][Ref / Label / Pattern] Make rotate/mirror consistent intrinsic transfomations

offset and repetition are extrinsic; use rotate_around() and flip() to
alter both
mirror() and rotate() only affect the object's intrinsic properties

masque/ref.py

@@ -166,9 +166,11 @@ class Ref(
         return pattern
 
     def rotate(self, rotation: float) -> Self:
+        """
+        Intrinsic transformation: Rotate the target pattern relative to this Ref's
+        origin. This does NOT affect the repetition grid.
+        """
         self.rotation += rotation
-        if self.repetition is not None:
-            self.repetition.rotate(rotation)
         return self
 
     def mirror(self, axis: int = 0) -> Self: