Fixes save encryption/import compatibility:
- Recovers valid SFO geometry from inconsistent legacy chives.json files.
- Supports stored and deflated ZIP encryption and nested save folders.
- Supports both native SFO block-field encodings.
- Unwraps valid nested PS5 save images during import.
- Preserves physical containers without inventing param.sfo metadata.
- Adds five local Playwright UI regression tests.
Validated on PS5 with regular, physical-SFO, zero-SFO, CoW, nested-container, stored-ZIP, and deflated-ZIP saves. Credit to Skiller for the fork source and chives.json layout.