Fix ExplainerHub add_dashboard_route after first request#335
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Summary
ExplainerHub.add_dashboardto support dynamic dashboard registration after the Flask app has already served requests whenadd_dashboard_route=True/add_dashboard/<name>flow after an initial request and verifies the dashboard is actually addedTODO.mdandRELEASE_NOTES.mdfor this fixRoot Cause
/add_dashboard/...runs insidebefore_requestand calls code paths that register Dash/Flask setup (blueprints/routes). Flask blocks setup mutations after first request, causing add to fail.Validation
uv run pytest -q tests/hub/test_hub.pyFixes #269