Fix egg sale form: remove duplicate route, change price to euros

The egg sale form had two issues:
- Duplicate POST /actions/product-sold route in products.py was
  overwriting the eggs.py handler, causing incomplete page responses
  (no tabs, no recent sales list)
- Price input used cents while feed purchase uses euros, inconsistent UX

Changes:
- Remove duplicate handler from products.py (keep only redirect)
- Change sell form price input from cents to euros (consistent with feed)
- Parse euros in handler, convert to cents for storage
- Add TestEggSale class with 4 tests for the fixed behavior

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/test_web_eggs.py

@@ -365,3 +365,66 @@ class TestEggCollectionAnimalFiltering:
             "Juvenile should NOT be associated with egg collection"
         )
         assert len(associated_ids) == 1, "Only adult females should be associated"
+
+
+class TestEggSale:
+    """Tests for POST /actions/product-sold from eggs page."""
+
+    def test_sell_form_accepts_euros(self, client, seeded_db):
+        """Price input should accept decimal euros like feed purchase."""
+        resp = client.post(
+            "/actions/product-sold",
+            data={
+                "product_code": "egg.duck",
+                "quantity": "10",
+                "total_price_euros": "12.50",  # Euros, not cents
+                "nonce": "test-nonce-sell-euros-1",
+            },
+        )
+        assert resp.status_code == 200
+
+        # Event should store 1250 cents
+        import json
+
+        event_row = seeded_db.execute(
+            "SELECT entity_refs FROM events WHERE type = 'ProductSold' ORDER BY id DESC LIMIT 1"
+        ).fetchone()
+        entity_refs = json.loads(event_row[0])
+        assert entity_refs["total_price_cents"] == 1250
+
+    def test_sell_response_includes_tabs(self, client, seeded_db):
+        """After recording sale, response should include full page with tabs."""
+        resp = client.post(
+            "/actions/product-sold",
+            data={
+                "product_code": "egg.duck",
+                "quantity": "10",
+                "total_price_euros": "15.00",
+                "nonce": "test-nonce-sell-tabs-1",
+            },
+        )
+        assert resp.status_code == 200
+        # Should have both tabs (proving it's the full eggs page)
+        assert "Harvest" in resp.text
+        assert "Sell" in resp.text
+
+    def test_sell_response_includes_recent_sales(self, client, seeded_db):
+        """After recording sale, response should include recent sales section."""
+        resp = client.post(
+            "/actions/product-sold",
+            data={
+                "product_code": "egg.duck",
+                "quantity": "10",
+                "total_price_euros": "15.00",
+                "nonce": "test-nonce-sell-recent-1",
+            },
+        )
+        assert resp.status_code == 200
+        assert "Recent Sales" in resp.text
+
+    def test_sell_form_has_euros_field(self, client):
+        """Sell form should have total_price_euros field, not total_price_cents."""
+        resp = client.get("/?tab=sell")
+        assert resp.status_code == 200
+        assert 'name="total_price_euros"' in resp.text
+        assert "Total Price" in resp.text