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.

apps/desktop/electron/workspace-cwd.cjs

@@ -0,0 +1,38 @@
+const path = require('node:path')
+
+/** True when `dir` lives inside a packaged app bundle / install tree. */
+function isPackagedInstallPath(dir, { installRoots, isPackaged }) {
+  if (!isPackaged || !dir) {
+    return false
+  }
+
+  let resolved
+
+  try {
+    resolved = path.resolve(String(dir))
+  } catch {
+    return false
+  }
+
+  const roots = new Set(
+    (installRoots ?? [])
+      .filter(Boolean)
+      .map(candidate => path.resolve(String(candidate)))
+  )
+
+  for (const root of roots) {
+    if (resolved === root) {
+      return true
+    }
+
+    const rel = path.relative(root, resolved)
+
+    if (rel && !rel.startsWith('..') && !path.isAbsolute(rel)) {
+      return true
+    }
+  }
+
+  return false
+}
+
+module.exports = { isPackagedInstallPath }