fix(cli): add missing ar locale + pin the toggle's unchanged contract

Review follow-up: ar.ts was the one locale of 17 missing
toggleTakesEffectAfterRestart (silent English fallback); add the Arabic
string. Pin dashboard_set_agent_plugin_enabled's contract — every ok
return carries an explicit `unchanged` boolean — with a parametrized
test over all four toggle paths, and document at the endpoint that a
missing key errs toward prompting a restart.

tests/hermes_cli/test_dashboard_plugin_toggle_restart_hint.py

@@ -90,3 +90,39 @@ def test_failed_toggle_has_no_restart_field(loopback_client, monkeypatch):
     )
     resp = loopback_client.post("/api/dashboard/agent-plugins/nope/disable")
     assert resp.status_code == 400
+
+
+@pytest.mark.parametrize(
+    ("enabled_now", "toggle_to", "expect_unchanged"),
+    [
+        (True, True, True),  # already enabled → no-op
+        (False, True, False),  # actually enables
+        (False, False, True),  # already disabled → no-op
+        (True, False, False),  # actually disables
+    ],
+)
+def test_real_toggle_always_reports_unchanged(
+    monkeypatch, enabled_now, toggle_to, expect_unchanged
+):
+    """Pin the ``unchanged`` contract of the REAL toggle the endpoint's
+    ``restart_required`` derivation depends on: every ``ok: True`` return
+    carries an explicit ``unchanged`` boolean. If a future refactor drops the
+    key on some path, the endpoint would misreport a no-op as
+    "restart required" — this test fails first."""
+    name = "web/exa"
+    en = {name} if enabled_now else set()
+    dis = set() if enabled_now else {name}
+    monkeypatch.setattr(plugins_cmd, "_resolve_plugin_key", lambda _n: _n)
+    monkeypatch.setattr(plugins_cmd, "_get_enabled_set", lambda: set(en))
+    monkeypatch.setattr(plugins_cmd, "_get_disabled_set", lambda: set(dis))
+    monkeypatch.setattr(plugins_cmd, "_set_plugin_enabled", lambda _n, enable: None)
+    monkeypatch.setattr(
+        plugins_cmd, "_toggle_plugin_toolset", lambda _n, enable: None
+    )
+
+    result = plugins_cmd.dashboard_set_agent_plugin_enabled(
+        name, enabled=toggle_to
+    )
+
+    assert result["ok"] is True
+    assert result["unchanged"] is expect_unchanged

web/src/i18n/ar.ts

@@ -269,6 +269,8 @@ export const ar = defineLocale({
     disableRuntime: "تعطيل",
     enableAfterInstall: "تفعيل بعد التثبيت",
     enableRuntime: "تفعيل",
+    toggleTakesEffectAfterRestart:
+      "تم الحفظ — أعد تشغيل البوابة لتطبيق التغيير.",
     forceReinstall: "إعادة تثبيت إجباري (حذف المجلد الموجود أولاً)",
     headline:
       "اكتشف وثبِّت وفعِّل وحدِّث مكوِّنات Hermes الإضافية (مطابقة `hermes plugins`).",