chore (supervisor/storage): optimize and rename

[varun-doshi]

Fixes #2338

[codecov]

Codecov Report

❌ Patch coverage is 69.23077% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.8%. Comparing base (665a908) to head (c2166d4).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...visor/storage/src/providers/derivation_provider.rs	69.2%	4 Missing ⚠️

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[Copilot]

Pull Request Overview

This PR refactors the latest_derived_block_at_source method in the DerivationProvider to optimize its implementation and improve naming clarity. The change replaces a loop-based traversal with a more efficient cursor-based approach.

Key changes:

• Renames method from latest_derived_block_at_source to latest_derived_ref_pair_at_source for better clarity
• Optimizes the traversal algorithm using database cursors instead of manual loop iteration
• Updates all call sites to use the new method name

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
crates/supervisor/storage/src/providers/derivation_provider.rs	Implements optimized cursor-based traversal and renames the method
crates/supervisor/storage/src/chaindb.rs	Updates method calls to use the new method name

[emhane]

nice! pending @varun-doshi or @sadiq1971