decouple legacy boolean privacy storage from new privacy level storage paths

[grantfox-oss]

storage migration logic for privacy_enabled and PrivacyLevel is intertwined and hard to maintain. Separate legacy compatibility helpers, migration tests, and documentation.

• Impacted files: app/contract/contracts/Folder/src/storage.rs, app/contract/contracts/Folder/src/privacy.rs, app/contract/contracts/Folder/src/types.rs, app/contract/contracts/Folder/src/storage_test.rs, app/contract/contracts/Folder/src/test.rs, `app/contract/docs/UPGRADE_SAFETY_GATE_QUICK_REFERENCE.md

[Truphile]

Hi team, I’d love to take this on!

I am a software engineer focused on building predictable systems, writing clean code, and uncovering subtle edge cases. I'm ready to dive into these requirements and deliver a highly secure, reliable solution.

I will deliver:

Defensive Implementation: Build out the core logic using explicit type safety and strict validation boundaries to neutralize potential runtime errors or logical oversights.

State & Schema Alignment: Update the underlying data schemas, backend logic, and API contracts symmetrically to prevent data fragmentation or desynchronization across layers.

Component Optimization: Refactor or introduce relevant interface blocks to handle loading states, success frames, and recovery triggers gracefully.

Bulletproof Test Coverage: Author comprehensive regression and property-based tests within our existing framework to guarantee long-term maintenance safety in CI.

Ready for assignment to drop a complete, robust PR immediately!

[temiport25]

can i handle this?

[grantfox-oss]

🦊 GrantFox — @temiport25 has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #317)
2. Your PR will be reviewed by the BlockDash-Studios maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@temiport25's PR #323 was approved and merged by @MaryammAli.

🏆 @temiport25: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (414 total points). Track your full progress on GrantFox.

👏 Great work, @temiport25! Keep contributing to BlockDash-Studios.