fix(tui): mouse wheel ansi codes leaking into editor

packages/tui/input/cursor.go

@@ -0,0 +1,7 @@
+package input
+
+import "image"
+
+// CursorPositionEvent represents a cursor position event. Where X is the
+// zero-based column and Y is the zero-based row.
+type CursorPositionEvent image.Point