QuiltView: import Surname for child-add path (#15)

`QuiltView/QuiltView.py:1266` constructs a fresh `Surname()` to
attach to a new `Name` when adding a child via the editor, but
`Surname` is never imported. Ruff (F821) flags it:

    F821 Undefined name `Surname`
       --> QuiltView/QuiltView.py:1266:26

The file already imports `Person, Family, ChildRef, Name` from
`gramps.gen.lib` — extend that import to include `Surname`. Without
it, the add-child path raises `NameError` instead of opening the
editor.

This PR addresses only the `Surname` F821. Two other F821 sites in
the same file (`displayer` on lines 1239/1241, where the call should
likely be `name_displayer.display(...)` rather than a top-level
`displayer` reference) are real-bug fixes and are deliberately left
out of this surgical lint PR — they need a small behavioural review
of their own.

Verified via `ruff check --select=E9,F63,F7,F82 --no-fix
--exclude='*.gpr.py' QuiltView/` (Surname F821 removed; the two
unrelated `displayer` F821s remain) and `python3 -m py_compile`.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: eduralph

QuiltView/QuiltView.py

@@ -56,7 +56,7 @@
 # Gramps Modules
 #
 #-------------------------------------------------------------------------
-from gramps.gen.lib import Person, Family, ChildRef, Name
+from gramps.gen.lib import Person, Family, ChildRef, Name, Surname
 from gramps.gui.views.navigationview import NavigationView
 from gramps.gen.display.name import displayer as name_displayer
 from gramps.gen.errors import WindowActiveError