perf: replace Uint8Array.slice with subarray

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📝 Walkthrough

Summary by CodeRabbit

• Performance
  • Improved internal byte handling across transaction processing, signing, encryption, decoding, and token operations.
• Compatibility
  • Preserved existing serialization formats, validation, error handling, public APIs, and transaction behavior.
• Documentation
  • Updated related usage guidance and examples to reflect the streamlined byte handling.

Walkthrough

This change replaces selected Uint8Array.slice() calls with subarray() across core codecs, transaction handling, signing, applications, examples, and documentation. Public APIs and observable byte ranges remain unchanged.

Changes

Uint8Array subarray migration

Layer / File(s)	Summary
Molecule decoder extraction packages/core/src/molecule/codec.ts	Molecule decoders use subarray() for headers, offsets, fields, variants, and payloads.
Core byte extraction and signing packages/core/src/ckb/transaction.ts, packages/core/src/client/jsonRpc/transformers.ts, packages/core/src/keystore/index.ts, packages/core/src/signer/..., packages/did-ckb/src/plc/index.ts	Transaction, DAO, keystore, Bitcoin, Dogecoin, secp256k1, and DID paths use subarray() for selected byte ranges.
Application and example integration packages/app/..., packages/demo/..., packages/examples/..., skills/ckb-ccc-udt/SKILL.md	Time-lock, Type ID, Taproot, and related examples use subarray() for byte extraction.

Estimated code review effort: 2 (Simple) | ~15 minutes

Merge Risk: 🔵 Low · up to 6d13b

Replacing byte-array copies with shared views may allow downstream decoders to retain or mutate backing storage where no ownership contract exists. This is a bounded correctness risk requiring owner awareness or follow-up, but no release-blocking impact is currently established.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 55.56% 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	The description includes the required contributing-guidelines confirmation, and the checkbox is marked as completed.
Title check	✅ Passed	The title clearly and concisely describes the main performance change across the pull request.
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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Actionable comments posted: 1

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Inline comments:
In `@packages/core/src/molecule/codec.ts`:
- Around line 101-103: Update the child-codec payload handling in
CodecLike.decode to pass an independent slice rather than a subarray view,
preventing custom codecs from mutating or retaining the parent buffer. Add tests
covering both input mutation and aliasing of returned bytes.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 9c17f42d-c45d-46a3-bc09-9aa917af969e

📥 Commits

Reviewing files that changed from the base of the PR and between f6aafb2 and 6d13bd6.

📒 Files selected for processing (16)

• packages/app/src/app/modules/time-locked-transfer-module.tsx
• packages/core/src/ckb/transaction.ts
• packages/core/src/client/jsonRpc/transformers.ts
• packages/core/src/keystore/index.ts
• packages/core/src/molecule/codec.ts
• packages/core/src/signer/btc/verify.ts
• packages/core/src/signer/ckb/secp256k1Signing.ts
• packages/core/src/signer/doge/signerDoge.ts
• packages/core/src/signer/doge/signerDogePrivateKey.ts
• packages/demo/src/app/connected/(tools)/IssueXUdtSus/page.tsx
• packages/demo/src/app/connected/(tools)/IssueXUdtTypeId/page.tsx
• packages/demo/src/app/connected/(tools)/TimeLockedTransfer/page.tsx
• packages/did-ckb/src/plc/index.ts
• packages/examples/src/issueUdtSus.ts
• packages/examples/src/transferBtc.ts
• skills/ckb-ccc-udt/SKILL.md

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