fix(tui): show the actual subscription provider in the Go TUI

The Go TUI rewrite hardcoded "ChatGPT subscription" in the stats view and its
snapshot only carried a boolean, so a Grok run was labeled ChatGPT — the same
bug previously fixed on the Python side. Carry the provider label through the
snapshot protocol and render it, falling back to a generic "Subscription".

utils._subscription_label becomes public subscription_label since the TUI
backend now needs it too.

tests/test_grok_routing.py

@@ -66,12 +66,12 @@ def test_subscription_label_prefers_persisted_provider(monkeypatch) -> None:  #
     resumed = mock.MagicMock(
         run_record={"auth_mode": "subscription", "subscription_provider": "Grok"}
     )
-    assert utils._subscription_label(resumed) == "Grok subscription"
+    assert utils.subscription_label(resumed) == "Grok subscription"
 
     # With no persisted provider, it derives the label from settings (not a
     # hardcoded default).
     fresh = mock.MagicMock(run_record={})
-    assert utils._subscription_label(fresh) == "ChatGPT subscription"
+    assert utils.subscription_label(fresh) == "ChatGPT subscription"
 
 
 def test_persisted_run_record_carries_provider(tmp_path, monkeypatch) -> None:  # type: ignore[no-untyped-def]

tests/test_tui_backend_controller.py

@@ -110,6 +110,28 @@ def test_state_populates_model_warning_for_non_frontier_model() -> None:
     assert "not a recommended frontier model" in warning
 
 
+def test_snapshot_carries_the_subscription_provider_label() -> None:
+    os.environ["STRIX_LLM"] = "grok/grok-4"
+    loader._cached = None
+
+    snapshot = TuiController(args()).snapshot()
+
+    # The TUI renders this label, so it must name the actual provider rather
+    # than assuming ChatGPT.
+    assert snapshot["subscription"] is True
+    assert snapshot["subscription_label"] == "Grok subscription"
+
+
+def test_snapshot_has_no_subscription_label_for_api_key_runs() -> None:
+    os.environ["STRIX_LLM"] = "openai/gpt-5.4"
+    loader._cached = None
+
+    snapshot = TuiController(args()).snapshot()
+
+    assert snapshot["subscription"] is False
+    assert snapshot["subscription_label"] == ""
+
+
 def test_setup_restores_prepared_cli_targets() -> None:
     setup_args = args()
     setup_args.targets_info = [