fix(snapshots): calculate full download from history window

[haardikk21]

Summary

• calculate the Full preset from complete State and Headers plus every Transactions, Receipts, and Account/Storage Changesets chunk overlapping the final 1,339,200 blocks
• derive the history cutoff from the manifest's actual snapshot block, so a partial newest chunk correctly causes three or four files to be counted
• keep Senders and RocksDB excluded from Full, while leaving Archive and Minimal totals unchanged
• cover both three- and four-file history windows with unit tests

Screenshots

Test plan

• npm test (338 tests)
• npm run typecheck
• npx eslint app/snapshots/data.ts app/snapshots/data.test.ts app/snapshots/r2.ts app/snapshots/r2.test.ts app/snapshots/SnapshotsClient.tsx
• npm run build
• validated the current mainnet manifest: block 50,758,927 produces cutoff 49,419,727 and selects four chunks per historical component
• visually verified /snapshots at 1440×1000

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
omni-ui	Ready	Preview	Sep 4, 2026 6:25pm UTC

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1