chore: remove utils crypto import

[rolznz]

Closes #561

updates generatePreimageAndPaymentHash to use crypto subtle to work in all environments

Summary by CodeRabbit

• Chores
  • Updated SDK version to 8.0.2 across all examples and documentation references.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 63b2e61f-2382-4c17-a458-bf79370c97de

📥 Commits

Reviewing files that changed from the base of the PR and between 919b2e3 and 08545b7.

📒 Files selected for processing (7)

• README.md
• examples/lnclient/paywall-esm.html
• examples/nwc/auth.html
• examples/nwc/auth_manual.html
• examples/nwc/client/auth.html
• examples/nwc/client/auth_manual.html
• src/utils.ts

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📝 Walkthrough

Walkthrough

This PR bumps the SDK version reference from 8.0.1 to 8.0.2 across documentation and examples, and refactors the cryptographic preimage and hash generation in src/utils.ts to use Web Crypto APIs instead of Node.js-specific crypto modules, enabling broader platform support.

Changes

Documentation and Examples Version Update

Layer / File(s)	Summary
Documentation and examples SDK version update README.md, examples/lnclient/paywall-esm.html, examples/nwc/auth.html, examples/nwc/auth_manual.html, examples/nwc/client/auth.html, examples/nwc/client/auth_manual.html	All documentation and example HTML files update their esm.sh imports from @getalby/sdk@8.0.1 to @getalby/sdk@8.0.2; no logic changes.
Web Crypto migration in utility functions src/utils.ts	The generatePreimageAndPaymentHash function removes the explicit Node.js crypto import and replaces it with Web Crypto APIs: crypto.getRandomValues for preimage generation and crypto.subtle.digest("SHA-256", ...) for hash computation, maintaining the same exported function signature.

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• getAlby/js-sdk#524: Introduces generatePreimageAndPaymentHash helper that is refactored in this PR to use Web Crypto APIs for cross-platform compatibility.
• getAlby/js-sdk#560: Updates the same README and example import URLs to bump the SDK version from 8.0.1 to 8.0.2.

Poem

🐰 From Node's crypto lands we hop away,
To Web APIs, cross-platform and grand,
With getRandomValues and subtle's display,
SHA-256 hashes now work hand in hand,
Version 8.0.2 lights up the day! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'chore: remove utils crypto import' accurately describes the main change: removing the Node.js crypto import from utils.ts and replacing it with Web Crypto APIs.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/utils-remove-crypto-import

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