Remove speculative band labels; revert class names to English

Translate UI to French; keep code comments in English

Redesign: five-step pedagogical flow with spectral baseline

Switch to real dataset: 4-class, rasterio patch loader, ignore unlabeled pixels

Move pixel info above fold, bind click to both rgb+overlay, add error surfacing

Simplify compare to 2 cols, fix pixel click by keeping columns always in DOM

Fix: add training progress bar, dynamic column visibility, pixel click on RGB

Refactor: replace fixed A/B/C slots with named model cache and dropdown comparison

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Delete train.py

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