fix: Mixtral and Ministral models render with no provider logo (#1640)

tests/test_providers_mixtral_logo_js.py

@@ -0,0 +1,36 @@
+"""Pin the Mistral provider-logo pattern to cover Mixtral and Ministral.
+
+The pattern was /mistral/i, which does not match "mixtral" (note the x) or
+"ministral" -- Mistral AI's flagship MoE and edge families -- so those models
+rendered with no provider logo unless they carried a "mistralai/" prefix.
+"""
+import json
+import shutil
+import subprocess
+from pathlib import Path
+
+import pytest
+
+_REPO = Path(__file__).resolve().parent.parent
+_HELPER = _REPO / "static" / "js" / "providers.js"
+pytestmark = pytest.mark.skipif(not shutil.which("node"), reason="node not on PATH")
+
+
+def _has_logo(model):
+    js = (
+        f"import {{ providerLogo }} from '{_HELPER.as_posix()}';"
+        f"console.log(JSON.stringify(providerLogo({json.dumps(model)}) !== null));"
+    )
+    p = subprocess.run(["node", "--input-type=module"], input=js, capture_output=True, text=True, cwd=str(_REPO), timeout=30)
+    assert p.returncode == 0, p.stderr
+    return json.loads(p.stdout.strip())
+
+
+def test_mixtral_ministral_get_a_logo():
+    assert _has_logo("mixtral-8x7b") is True
+    assert _has_logo("ministral-8b") is True
+    assert _has_logo("mistral-large-latest") is True
+
+
+def test_unknown_vendor_has_no_logo():
+    assert _has_logo("totally-unknown-model-xyz") is False