fix: show correct breadcrumb label for SDK evaluations

The breadcrumb always showed 'Auto Evals' for SDK evaluations because:

1. test.tsx normalized type='custom' to 'auto' before passing to
   EvalRunPreviewPage, losing the SDK type information
2. Page.tsx typeMap had no 'custom' entry
3. buildBreadcrumbs.ts hardcoded 'auto evaluation' as fallback label

Fix:
- Remove the custom→auto normalization in test.tsx
- Add 'custom' → 'SDK Evals' entry to Page.tsx typeMap (matches the
  tab label in EvaluationsView.tsx)
- Change buildBreadcrumbs.ts fallback from 'auto evaluation' to
  'Evaluations'

Closes #4549

Author: GanJiaKouN16

web/oss/src/components/EvalRunDetails/components/Page.tsx

@@ -48,6 +48,7 @@ const EvalRunPreviewPage = ({runId, evaluationType, projectId = null}: EvalRunPr
     const evaluationTypeBreadcrumb = useMemo(() => {
         const typeMap: Record<string, {label: string; kind: string}> = {
             auto: {label: "Auto Evals", kind: "auto"},
+            custom: {label: "SDK Evals", kind: "custom"},
             human: {label: "Human Evals", kind: "human"},
             online: {label: "Live Evals", kind: "online"},
         }

web/oss/src/components/EvalRunDetails/test.tsx

@@ -8,8 +8,7 @@ import EvalResultsOnboarding from "./EvalResultsOnboarding"
 type EvalRunKind = "auto" | "human" | "online" | "custom"
 
 const EvalRunTestPage = ({type = "auto"}: {type?: EvalRunKind}) => {
-    // Normalize "custom" to "auto", but keep "online" as-is
-    const evaluationType = type === "custom" ? "auto" : type
+    const evaluationType = type
     const router = useRouter()
     const evaluationIdParam = router.query?.evaluation_id
     const projectIdParam = router.query?.project_id

web/oss/src/lib/helpers/buildBreadcrumbs.ts

@@ -81,7 +81,7 @@ export const buildBreadcrumbSegments = ({
             if (seg === "evaluations") {
                 const hasResults = next === "results"
                 const evaluationsHref = `${baseAppsPath}/${appId}/evaluations`
-                items["appPage"] = {label: "auto evaluation", href: evaluationsHref}
+                items["appPage"] = {label: "Evaluations", href: evaluationsHref}
 
                 if (hasResults) {
                     i++