Fix detail pricing labels and price semantics tests

frontend/components/dashboard/ScanTerminalDashboard.tsx

@@ -142,6 +142,34 @@ function getSideRow(
   return null;
 }
 
+function getDetailSideAsk(
+  scanRow: ScanOpportunityRow | null,
+  marketScan: MarketScan | null | undefined,
+  side: "yes" | "no",
+) {
+  if (scanRow?.ask != null) return scanRow.ask;
+  if (side === "yes") {
+    if (scanRow?.yes_ask != null) return scanRow.yes_ask;
+    return marketScan?.yes_buy ?? null;
+  }
+  if (scanRow?.no_ask != null) return scanRow.no_ask;
+  return marketScan?.no_buy ?? null;
+}
+
+function getDetailSideBid(
+  scanRow: ScanOpportunityRow | null,
+  marketScan: MarketScan | null | undefined,
+  side: "yes" | "no",
+) {
+  if (scanRow?.bid != null) return scanRow.bid;
+  if (side === "yes") {
+    if (scanRow?.yes_bid != null) return scanRow.yes_bid;
+    return marketScan?.yes_sell ?? null;
+  }
+  if (scanRow?.no_bid != null) return scanRow.no_bid;
+  return marketScan?.no_sell ?? null;
+}
+
 function buildComparisonBuckets(
   marketScan: MarketScan | null | undefined,
   row: ScanOpportunityRow | null,
@@ -396,24 +424,30 @@ function DetailPanel({
               {isEn ? "Buy Yes" : "买入 Yes"} {displayRow.target_label || ""}
             </div>
             <p>
-              {formatPrice(yesRow?.ask ?? marketScan?.yes_buy)} →{" "}
+              {formatPrice(getDetailSideAsk(yesRow, marketScan, "yes"))} →{" "}
               {formatProbability(yesRow?.model_probability)}
             </p>
             <p className="positive">{formatPercent(yesRow?.edge_percent, true)} {isEn ? "edge" : "边际优势"}</p>
-            <p>{isEn ? "Spread" : "点差"} {formatPrice(yesRow?.spread)}</p>
+            <p>
+              {isEn ? "Bid / Ask" : "买卖价"} {formatPrice(getDetailSideBid(yesRow, marketScan, "yes"))} /{" "}
+              {formatPrice(getDetailSideAsk(yesRow, marketScan, "yes"))}
+            </p>
           </div>
           <div className="scan-trade-card sell">
             <div className="scan-trade-card-title">
               {isEn ? "Buy No" : "买入 No"} {displayRow.target_label || ""}
             </div>
             <p>
-              {formatPrice(noRow?.ask ?? marketScan?.no_buy)} →{" "}
+              {formatPrice(getDetailSideAsk(noRow, marketScan, "no"))} →{" "}
               {formatProbability(noRow?.model_probability)}
             </p>
             <p className={Number(noRow?.edge_percent || 0) >= 0 ? "positive" : "negative"}>
               {formatPercent(noRow?.edge_percent, true)} {isEn ? "edge" : "边际优势"}
             </p>
-            <p>{isEn ? "Spread" : "点差"} {formatPrice(noRow?.spread)}</p>
+            <p>
+              {isEn ? "Bid / Ask" : "买卖价"} {formatPrice(getDetailSideBid(noRow, marketScan, "no"))} /{" "}
+              {formatPrice(getDetailSideAsk(noRow, marketScan, "no"))}
+            </p>
           </div>
         </div>
       </section>

tests/test_polymarket_readonly.py

@@ -40,8 +40,8 @@ def test_extract_market_bucket_range_supports_fahrenheit_ranges():
 def test_fetch_token_market_data_uses_rest_orderbook_executable_prices():
     layer = PolymarketReadOnlyLayer()
     payloads = {
-        ("/price", "BUY"): {"price": "0.11"},
-        ("/price", "SELL"): {"price": "0.88"},
+        ("/price", "BUY"): {"price": "0.27"},
+        ("/price", "SELL"): {"price": "0.23"},
         ("/midpoint", None): {"midpoint": "0.50"},
         ("/last-trade-price", None): {"price": "0.49"},
         ("/book", None): {
@@ -68,6 +68,30 @@ def test_fetch_token_market_data_uses_rest_orderbook_executable_prices():
     assert data["quote_source"] == "polymarket_clob_rest"
 
 
+def test_fetch_token_market_data_keeps_buy_sell_semantics_without_orderbook():
+    layer = PolymarketReadOnlyLayer()
+    payloads = {
+        ("/price", "BUY"): {"price": "0.23"},
+        ("/price", "SELL"): {"price": "0.27"},
+        ("/midpoint", None): {"midpoint": "0.25"},
+        ("/last-trade-price", None): {"price": "0.24"},
+        ("/book", None): None,
+    }
+
+    def _fake_clob_get(path, params):
+        if path == "/price":
+            return payloads[(path, params.get("side"))]
+        return payloads[(path, None)]
+
+    layer._clob_get = _fake_clob_get
+
+    data = layer._fetch_token_market_data("token-1")
+
+    assert data["buy"] == 0.27
+    assert data["sell"] == 0.23
+    assert data["midpoint"] == 0.25
+
+
 def test_get_token_market_data_uses_price_cache_within_ttl():
     layer = PolymarketReadOnlyLayer()
     calls = []