fix: default light mode + lock deps with npm ci in both Dockerfiles

fix: add missing useCallback import (blank page crash) + lock CSS import order + pin package-lock.json for HF reproducibility

Refine UI alignment, fix dark mode toggle, and improve model selection logic

fix: restore working copy/save buttons in dark mode and elevate model prompt styling

fix: dynamic compression ratio, CUD badge in navbar, slate-300 borders, matched output text size

fix: complete light mode - dataset preview, stats cards, model names, buttons all readable

feat: UI overhaul - light mode, larger text, live ROUGE metrics, dataset loader, speed improvements

Final cleanup for alignment and model selection

Refine UI and fix model selection bugs