decrypt_creds(override_json) era in afara try/except-ului care protejeaza
raw_json in preview_import (import_router) si _web_compute_preview (routes).
La rotatie cheie Fernet (risc acceptat R4) sau token corupt, raw_json degrada
gratios la {} dar override_json arunca 500 pe tot batch-ul. Acum ambalat
identic (fallback None -> {}).
Prins de /code-review high la CLOSE. Writeback: ROADMAP 3.6 -> DONE,
PRD -> inchis + Raport CLOSE. Duplicare _override_of/canonicalize notata
ca cleanup viitor (disciplina backend-neatins). 523 teste pass.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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