app.py: rename Full to Slow + plain-language Fast/Slow XAI explainer (predicted values are the same; only attribution method differs); add optional Goatcounter visitor-tracking pixel via GOATCOUNTER_CODE env var
app.py: per-property XAI in Fast mode (~35s, all rows correctly classified); Full stays target-only with Fast surrogate for other rows; About tab rewritten with honest how-to-use guidance