tests: pin ink engine in _make_tui_argv npm-bootstrap tests (post-merge semantic fix)

Main's rewritten test_tui_npm_install.py tests call _make_tui_argv expecting
the Ink/npm flow unconditionally; with the dual-engine dispatch merged in,
_resolve_tui_engine() auto-selects opentui whenever ui-opentui/dist is built
in the repo, routing the call away from the path under test (first subprocess
became 'node --version' instead of 'npm run build'). Pin the engine to ink
via an autouse fixture, mirroring the existing pinning precedent in
test_tui_resume_flow.py.

tests/hermes_cli/test_system_stats_platform.py

@@ -0,0 +1,44 @@
+from hermes_cli.web_server import _display_system_platform
+
+
+def test_windows_11_build_displays_as_windows_11():
+    info = _display_system_platform(
+        system="Windows",
+        release="10",
+        version="10.0.26200",
+        platform_label="Windows-10-10.0.26200-SP0",
+    )
+
+    assert info["os"] == "Windows"
+    assert info["os_release"] == "11"
+    assert info["os_version"] == "10.0.26200"
+    assert info["platform"] == "Windows-11-10.0.26200-SP0"
+
+
+def test_windows_10_build_keeps_windows_10_label():
+    info = _display_system_platform(
+        system="Windows",
+        release="10",
+        version="10.0.19045",
+        platform_label="Windows-10-10.0.19045-SP0",
+    )
+
+    assert info["os"] == "Windows"
+    assert info["os_release"] == "10"
+    assert info["platform"] == "Windows-10-10.0.19045-SP0"
+
+
+def test_non_windows_platform_unchanged():
+    info = _display_system_platform(
+        system="Linux",
+        release="6.8.0",
+        version="#1 SMP",
+        platform_label="Linux-6.8.0-x86_64-with-glibc2.39",
+    )
+
+    assert info == {
+        "os": "Linux",
+        "os_release": "6.8.0",
+        "os_version": "#1 SMP",
+        "platform": "Linux-6.8.0-x86_64-with-glibc2.39",
+    }