[IMP] website_sale_aplicoop: surface the tax display setting on the Eskaera page

Pricing now follows website_sale, which includes the website's `Display
Product Prices`. That setting defaults to tax-excluded in 18.0, so a website
nobody configured shows Eskaera prices without VAT -- correct behaviour, but
easy to read as a bug when the members are consumers and expect the price they
will pay.

The setting is a related field website_sale already exposes, so it now appears
in the Eskaera block too, right where the co-op switches the feature on, rather
than only under eCommerce.

Tests cover both values on the shop and the listing paths, so the tax-excluded
case is a decision on record instead of a surprise.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

website_sale_aplicoop/tests/test_pricing_delegation.py

@@ -129,6 +129,67 @@ class TestStandardPricelistResolution(PricingDelegationCommon, TransactionCase):
         self.assertEqual(resolved, expected)
 
 
+@tagged("post_install", "-at_install")
+class TestTaxDisplayFollowsTheWebsite(PricingDelegationCommon, TransactionCase):
+    """Displayed prices honour the website's `Display Product Prices`.
+
+    Eskaera used to hardcode the tax-included display and ignore the setting.
+    Now it follows website_sale, which means a website left on the Odoo default
+    (`tax_excluded`) shows prices without VAT -- correct, but surprising enough
+    to be worth pinning down here.
+    """
+
+    def setUp(self):
+        super().setUp()
+        self.pricelist = self._create_pricelist("Display PL")
+        self.tax_21 = self._create_tax("IVA 21%", 21.0)
+        self.product = self._create_product("Display Product", 100.0, self.tax_21)
+
+    def _price(self):
+        return self.controller._get_pricing_info(
+            self.product, self.pricelist, quantity=1.0
+        )
+
+    def test_gross_price_on_a_tax_included_website(self):
+        """A consumer-facing website quotes what the member pays."""
+        self.website.show_line_subtotals_tax_selection = "tax_included"
+
+        pricing = self._price()
+
+        self.assertAlmostEqual(pricing["price"], 121.0, places=2)
+        self.assertAlmostEqual(pricing["price_unit"], 100.0, places=2)
+        self.assertTrue(pricing["tax_included"])
+
+    def test_net_price_on_a_tax_excluded_website(self):
+        """A website set to tax-excluded shows the net price."""
+        self.website.show_line_subtotals_tax_selection = "tax_excluded"
+
+        pricing = self._price()
+
+        self.assertAlmostEqual(pricing["price"], 100.0, places=2)
+        self.assertAlmostEqual(pricing["price_unit"], 100.0, places=2)
+        self.assertFalse(pricing["tax_included"])
+
+    def test_the_setting_is_what_moves_the_price(self):
+        """Nothing but the website setting changes between the two."""
+        self.website.show_line_subtotals_tax_selection = "tax_included"
+        gross = self._price()["price"]
+
+        self.website.show_line_subtotals_tax_selection = "tax_excluded"
+        net = self._price()["price"]
+
+        self.assertAlmostEqual(gross - net, 21.0, places=2)
+
+    def test_batched_listing_follows_the_same_setting(self):
+        """The listing path must not disagree with the single-product one."""
+        self.website.show_line_subtotals_tax_selection = "tax_excluded"
+
+        batched = self.controller._compute_price_info(self.product, self.pricelist)
+
+        self.assertAlmostEqual(batched[self.product.id]["price"], 100.0, places=2)
+        self.assertFalse(batched[self.product.id]["tax_included"])
+
+
 @tagged("post_install", "-at_install")
 class TestTaxIncludedFiscalPosition(PricingDelegationCommon, TransactionCase):
     """A remapped tax-included tax must rebase the displayed price."""