docs(changelog): sync full changelog from tego-standard

[baizixv]

Automatically sync full changelog files from tego-standard repository to ensure consistency. This PR overwrites the changelog files in docs repository with the complete changelog from tego-standard repository.

Summary by CodeRabbit

Release Notes

• Documentation

  • Updated changelog to document v1.6.21 release with version reference links.

• Bug Fixes

  • Fixed client-side handling of GMT date boundary values during parsing.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 91d99e62-2a82-4e2d-9cbb-5077a76fe702

📥 Commits

Reviewing files that changed from the base of the PR and between 9de2a02 and ca435e3.

📒 Files selected for processing (2)

• docs/en/changelog/changelog.md
• docs/zh/changelog/changelog.md

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📝 Walkthrough

Walkthrough

This PR documents the v1.6.21 release in both English and Chinese changelog files. A new version entry dated 2026-05-22 is added with a client fix for preserving gmt:true parsing for naive GMT date boundary values. Reference links at the bottom are updated so [Unreleased] compares from v1.6.21 and a new [1.6.21] release link is added.

Changes

v1.6.21 Release Documentation

Layer / File(s)	Summary
v1.6.21 Release Entry and Reference Links docs/en/changelog/changelog.md, docs/zh/changelog/changelog.md	Added v1.6.21 release section (2026-05-22) under "🐛 Fixed" with a client fix for gmt:true GMT date boundary parsing in both English and Chinese changelogs. Updated markdown reference definitions at the bottom to point [Unreleased] from v1.6.21 and added the new [1.6.21] release tag link in both files.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• tegojs/docs#229: Both PRs modify changelog files by adding new version release sections under 🐛 Fixed and updating the [Unreleased] compare baseline and release tag link definitions.
• tegojs/docs#230: Both PRs update the same changelog documentation files by adding a new version release section and adjusting the [Unreleased]/release tag comparison links.
• tegojs/docs#223: Both PRs modify the same changelog markdown files by adding new version "Fixed" release sections and updating the [Unreleased] compare base plus the corresponding release reference link definitions.

Poem

🐰 A changelog grows with each tiny hop,
v1.6.21 marks the moment we stop,
Gmt dates now parse with glee,
English and Chinese—in harmony! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/sync-full-changelog-20260522-083639

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