fix(dashboard): probe System One models through /v1/systemone

The inline model test sent a chat-completions payload and failed with
500 on decision models. Add a systemone branch to pingModelByKind that
submits a native state+questions probe, and restore the test button
that was hidden for System One models.

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

src/app/(dashboard)/dashboard/providers/components/ModelsCard.js

@@ -119,7 +119,6 @@ export default function ModelsCard({ providerId, kindFilter, providerAliasOverri
 
   const providerAlias = providerAliasOverride || getProviderAlias(providerId);
   const effectiveType = kindFilter || "llm";
-  const supportsTest = kindFilter !== "systemone";
 
   const fetchData = useCallback(async () => {
     try {
@@ -239,7 +238,7 @@ export default function ModelsCard({ providerId, kindFilter, providerAliasOverri
                 onSetAlias={(alias) => handleSetAlias(model.id, alias)}
                 onDeleteAlias={() => handleDeleteAlias(existingAlias)}
                 testStatus={modelTestResults[model.id]}
-                onTest={supportsTest ? () => handleTestModel(model.id) : undefined}
+                onTest={() => handleTestModel(model.id)}
                 isTesting={testingModelId === model.id}
                 isFree={model.isFree}
               />
@@ -256,7 +255,7 @@ export default function ModelsCard({ providerId, kindFilter, providerAliasOverri
               onSetAlias={() => {}}
               onDeleteAlias={() => handleDeleteCustomModel(model.id)}
               testStatus={modelTestResults[model.id]}
-              onTest={supportsTest ? () => handleTestModel(model.id) : undefined}
+              onTest={() => handleTestModel(model.id)}
               isTesting={testingModelId === model.id}
               isCustom
             />

src/app/api/models/test/ping.js

@@ -132,6 +132,36 @@ export async function pingModelByKind(model, kind, baseUrl = `http://127.0.0.1:$
     return { ok: true, latencyMs, error: null, status: res.status };
   }
 
+  if (kind === "systemone") {
+    const res = await fetch(`${baseUrl}/api/v1/systemone`, {
+      method: "POST",
+      headers,
+      body: JSON.stringify({
+        model,
+        state: "Customer: I was charged twice for my order this morning.",
+        questions: {
+          probe: { type: "noul", instructions: "Is the customer reporting a billing problem?" },
+        },
+      }),
+      signal: AbortSignal.timeout(15000),
+    });
+    const latencyMs = Date.now() - start;
+    const rawText = await res.text().catch(() => "");
+    let parsed = null;
+    try { parsed = rawText ? JSON.parse(rawText) : null; } catch {}
+
+    if (!res.ok) {
+      const detail = parsed?.error?.message || parsed?.msg || parsed?.message || parsed?.error || rawText;
+      return { ok: false, latencyMs, error: `HTTP ${res.status}${detail ? `: ${String(detail).slice(0, 240)}` : ""}`, status: res.status };
+    }
+
+    const hasAnswers = parsed?.answers && typeof parsed.answers === "object" && Object.keys(parsed.answers).length > 0;
+    if (!hasAnswers) {
+      return { ok: false, latencyMs, status: res.status, error: "Provider returned no answers for this model" };
+    }
+    return { ok: true, latencyMs, error: null, status: res.status };
+  }
+
   const res = await fetch(`${baseUrl}/api/v1/chat/completions`, {
     method: "POST",
     headers,