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

Documentation

• Added v1.6.19 release documentation (2026-05-20) describing important bug fixes affecting custom filter arrays and date picker range filter functionality. Updated changelog entries in both English and Chinese versions with new version tag links and modified comparison baselines to maintain accurate release tracking information and historical references across all documentation resources.

[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: 6f64ce20-4106-4c29-b50f-eb76b63ccf45

📥 Commits

Reviewing files that changed from the base of the PR and between eb1366c and d033f6d.

📒 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 v1.6.19 release across dual-language changelogs. It adds release notes with client bug fixes in both English and Chinese, updates the Unreleased comparison baseline from v1.6.18/v1.6.19 to point forward, and creates a new release tag reference link for v1.6.19.

Changes

v1.6.19 Release Documentation

Layer / File(s)	Summary
English changelog v1.6.19 entry docs/en/changelog/changelog.md	Inserted the v1.6.19 release section (dated 2026-05-20) with three Fixed client items and PR references; updated the Unreleased comparison to start from v1.6.19 and added the release tag link reference.
Chinese changelog v1.6.19 entry docs/zh/changelog/changelog.md	Inserted the v1.6.19 release section (dated 2026-05-20) with two Fixed client items covering custom filter and date picker improvements; updated version links to reflect the new release baseline and tag.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• tegojs/docs#219: Both PRs modify the same changelog documentation files (docs/en/changelog/changelog.md and docs/zh/changelog/changelog.md) by updating the Unreleased sections with new "🐛 Fixed" entries and related changelog/link references.
• tegojs/docs#218: Both PRs modify the same changelog files (docs/en/changelog/changelog.md and docs/zh/changelog/changelog.md) by adding a new release section and updating the [Unreleased] compare baseline plus the [1.x.x] release tag link.
• tegojs/docs#196: Both PRs modify the same changelog files (docs/en/changelog/changelog.md and docs/zh/changelog/changelog.md) by adding new release sections under "Unreleased" and updating the bottom version/compare link references to point at the newly added tag.

Poem

🐰 A changelog grows with each hop and bound,
v1.6.19 fixes found!
English, Chinese, side by side,
Bug squashes—our code's pride!
📝✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/sync-full-changelog-20260520-111543

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