Feat: File Integrity Checker

[hariharjeevan]

Summary

Adds a new File Integrity Checker utility that lets users generate SHA-256, SHA-512, or MD5 hashes for any local file and verify them against a known hash; No file size limits.

Features

• Chunked hashing (hashFileChunked): reads the file in 8MB slices via file.slice() and streams each chunk into crypto.createHash, so memory usage stays constant regardless of file size.
• Algorithm selector (SHA-256 / SHA-512 / MD5). Switching algorithms after a hash has already been computed triggers a fresh read + hash for the newly selected algorithm rather than reusing stale state.

Testing

Added file-integrity-checker.test.tsx covering:

• Uploading a file automatically computes and displays the SHA-256 hash (default algorithm) without requiring a manual "compute" action.
• Switching the algorithm selector (e.g. to MD5) clears the stale SHA-256 hash and recomputes/display the correct-length hash for the newly selected algorithm.
• Tested hash generation for a 11 GB file.

Screenshot

[peckz]

Thank you @hariharjeevan appreciate the effort!