fix(dashboard): render tracemetrics widgets in dashboard view (#692)

tracemetrics was missing from WIDGET_TYPE_TO_DATASET, causing
mapWidgetTypeToDataset("tracemetrics") to return null and all
tracemetrics widgets to be classified as "unsupported" placeholders.

Add the mapping tracemetrics → "metricsEnhanced" so the existing
timeseries/big_number rendering paths handle these widgets correctly.

Author: BYK

src/types/dashboard.ts

@@ -995,7 +995,7 @@ export type WidgetDataResult =
 /**
  * Maps widget types to API dataset parameter values.
  *
- * Widget types that don't map to a dataset (issue, tracemetrics, etc.)
+ * Widget types that don't map to a dataset (issue, preprod-app-size, etc.)
  * return null and are rendered as "unsupported".
  */
 const WIDGET_TYPE_TO_DATASET: Record<string, string> = {
@@ -1004,6 +1004,7 @@ const WIDGET_TYPE_TO_DATASET: Record<string, string> = {
   "error-events": "errors",
   "transaction-like": "transactions",
   logs: "logs",
+  tracemetrics: "metricsEnhanced",
 };
 
 /**

test/types/dashboard.test.ts

@@ -765,11 +765,11 @@ describe("mapWidgetTypeToDataset", () => {
     expect(mapWidgetTypeToDataset("error-events")).toBe("errors");
     expect(mapWidgetTypeToDataset("transaction-like")).toBe("transactions");
     expect(mapWidgetTypeToDataset("logs")).toBe("logs");
+    expect(mapWidgetTypeToDataset("tracemetrics")).toBe("metricsEnhanced");
   });
 
   test("returns null for unsupported widget types", () => {
     expect(mapWidgetTypeToDataset("issue")).toBeNull();
-    expect(mapWidgetTypeToDataset("tracemetrics")).toBeNull();
     expect(mapWidgetTypeToDataset("preprod-app-size")).toBeNull();
   });