chore: bump nimqml-seaqt (model wrappers own their C++ object)

The model setups never set QObject.owner, so delete() silently no-oped for
every model: dropping a Nim model leaked its C++ object alive with a dangling
Nim pointer, and any later consumer callback (view rowCount, roleNames) was a
use-after-free. This crashed the send modal when switching networks dropped
token-selector rows whose nested submodels QML still referenced.

https://github.com/seaqt/nimqml-seaqt/commit/87d0d12

test/nim/token_selector_model_test.nim

@@ -174,6 +174,17 @@ suite "TokenSelectorModel - nested balances submodel":
   teardown:
     spy.disable()
 
+  test "deleting a model actually deletes the C++ object (owner flag set)":
+    # nimqml-seaqt QAbstractItemModel/ListModel/TableModel setups assign vptr but
+    # never set QObject.owner, so delete() silently no-ops: the C++ model leaks
+    # alive with a dangling Nim pointer, and any consumer callback afterwards
+    # (view rowAt -> rowCount, ModelQuery roleNames) is a use-after-free — the
+    # send-modal token-selector crash.
+    let doomed = newTokenSelectorBalancesModel(@[])
+    check doomed.vptr != nil
+    doomed.QAbstractListModel.delete()
+    check doomed.vptr == nil   # delete must reach the C++ side, not early-return
+
   test "balances submodel exposes the chips joined per chain":
     let m = newTokenSelectorModel()
     m.setSourceItems(@[