[Yashkush06]

Summary

Closes #181.

Adds dedicated regression test coverage for windows/identity.js, covering the DPAPI-backed passphrase storage introduced in #139 and safety guards from #137.

What is covered:

• DPAPI encryption and decryption: Validates that writePass encrypts the passphrase with safeStorage.encryptString and readPass decrypts it.
• Legacy plaintext migration: Validates that older 48-character hex plaintext passphrases are recognized, returned, and re-sealed on disk with DPAPI on first read.
• safeStorage unavailable fallback: Validates that when DPAPI encryption is not available, passphrases fall back to plain text read/write cleanly.
• Invalid / corrupted data safety: Ensures corrupted ciphertext or unreadable passphrases that fail decryption are never overwritten on disk, preventing data loss.
• Whitespace / newline handling: Verifies whitespace/newlines are properly trimmed in both DPAPI and plaintext modes.

Verification

Ran tests with node --test windows/test/identity.test.js:

• 9 tests passing (0 failures).
• Syntax validated with node --check.