Complete French→English translation across all frontend pages and backend
services — every label, button, header, empty state, toast, and nav item
is now in English. Build verified clean (tsc + vite). No i18n library
added; direct string replacement throughout.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Replace 1-day change_pct with weighted blend (20% 1d / 50% 5d / 30% 10d)
for all 20 scored signals. Add Bayesian prior from rolling 25-day history
(weight 15%→45%) and a 10-point persistence threshold before regime switch.
Bootstrap on first load: replays last 20 trading days via yf.download batch
(45d) to pre-populate _regime_history, so stability is visible immediately.
Frontend: adds 'stable Xj' badge and history depth indicator on regime banner.
Doc: updates v4.0→v4.1, rewrites Étape 1 Régime Macro and glossary entry.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
