[FIX] website_sale_aplicoop: split cart and cycle stamp in localStorage

965c5c2 stored the cart as {cutoff_date, items: {...}} in
eskaera_<id>_cart. That broke every other reader of the same key:

- checkout_labels.js iterates Object.keys() expecting product IDs and
  rendered "cutoff_date" / "items" as ghost rows → users on the
  checkout page saw their cart as empty.
- home_delivery.js read/wrote the cart in place; the in-place mutation
  destroyed the wrapper.
- _saveOrderDraft serialised the same object straight to the server,
  POSTing "cutoff_date" and "items" as productIds.

Split the schema: eskaera_<id>_cart keeps the plain {productId: {...}}
shape every other JS file already relies on; the cycle marker moves to
eskaera_<id>_cart_cycle. _loadCart migrates browsers still holding the
v18.0.1.10.0 wrapped value on the next read.

Also make eviction strictly opt-in: drop the cart only when we know
the current cycle AND the stored cycle disagrees. Missing data on
either side (check-status didn't run, XHR failed) → preserve. This
restores the checkout page where check-status isn't called.

Version bump triggers the in-tab auto-reload added in 6e6d1e5 for
clients already on that build.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

website_sale_aplicoop/__manifest__.py

@@ -3,7 +3,7 @@
 
 {  # noqa: B018
     "name": "Website Sale - Aplicoop",
-    "version": "18.0.1.10.1",
+    "version": "18.0.1.10.2",
     "category": "Website/Sale",
     "summary": "Modern replacement of legacy Aplicoop - Collaborative consumption group orders",
     "author": "Odoo Community Association (OCA), Criptomart",