Add BrowserEd25519 and BrowserX25519

[terrier989]

No description provided.

[Copilot]

Pull request overview

This PR adds browser-based Web Cryptography API implementations for Ed25519 and X25519 algorithms with fallback to Dart implementations. It also refactors Ed25519 validation logic into static helper methods and reorganizes imports for consistency.

Key changes:

• Introduces BrowserEd25519 and BrowserX25519 classes that leverage Web Cryptography API
• Refactors Ed25519 validation into reusable static methods (checkPrivateKeyLength, checkPublicKeyLength, checkSignatureLength)
• Standardizes import ordering across browser implementation files

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
cryptography/lib/src/browser/ed25519.dart	New BrowserEd25519 implementation with Web Crypto API support and fallback
cryptography/lib/src/browser/x25519.dart	New BrowserX25519 implementation with Web Crypto API support and fallback
cryptography/lib/src/dart/ed25519.dart	Refactored to use static validation methods from Ed25519 base class
cryptography/lib/src/browser/browser_cryptography.dart	Integrated new ed25519() and x25519() methods, reordered imports
cryptography/lib/src/browser/browser_cryptography_when_not_browser.dart	Reordered isRunningInWasm and isSupported getters
cryptography/lib/src/browser/rsa_ssa_pkcs1v15.dart	Standardized import ordering
cryptography/lib/src/browser/rsa_pss.dart	Standardized import ordering
cryptography/lib/src/browser/pbkdf2.dart	Standardized import ordering
cryptography/lib/src/browser/aes_gcm.dart	Standardized import ordering
cryptography/lib/src/browser/aes_ctr.dart	Standardized import ordering
cryptography/lib/src/browser/aes_cbc.dart	Standardized import ordering
cryptography/lib/src/browser/_javascript_bindings.dart	Added blank lines for better formatting in CryptoKey extension type
cryptography_test/lib/algorithms/ed25519.dart	Simplified test structure by removing anonymous function wrapper

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