Silent KeyError in Illustration Progress Update

[CyberSecDef]

Problem

In novelforge/routes/export.py lines 571-574:

try:
    progress_manager.update(token, {"illustration_token": illust_token})
except KeyError:
    pass

If the progress entry is deleted while illustrations are generating, the KeyError is silently swallowed. The illustration is saved to disk but never linked to the progress data.

Why It Matters

Disk space consumed with orphaned images the user cannot access from the UI.

Recommended Fix

Log a warning instead of silently passing:

except KeyError:
    logger.warning("Could not link illustration to novel (progress entry %s not found).", token)