fix: always run npm ci + build in e2e dashboard fixture

Remove the early return when dist/ already exists so that the dashboard
is always rebuilt, ensuring tests never run against stale assets.

Co-authored-by: Russell Power <rjpower@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 3 people

lib/iris/tests/e2e/conftest.py

@@ -51,9 +51,6 @@
 def _ensure_dashboard_built():
     """Build dashboard assets once per session so dashboard tests have content to render."""
     dashboard_dir = IRIS_ROOT / "dashboard"
-    dist_dir = dashboard_dir / "dist"
-    if dist_dir.exists() and any(dist_dir.iterdir()):
-        return
     if not (dashboard_dir / "package.json").exists():
         return
     if shutil.which("npm") is None: