docs(changelog): add new entries from changelog

[windmill-internal-app]

This PR adds new changelog entries.

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Important

Adds a new changelog entry 'Branch-specific items' to changelogs.ts.

• Changelog Update:
  • Adds new entry 'Branch-specific items' to changelogs in changelogs.ts with href 'https://www.windmill.dev/changelog/branch-specific-items' and date '2025-08-27'.

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[cloudflare-workers-and-pages]

Deploying windmill with    Cloudflare Pages

Latest commit:	158a72b
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Preview URL:	https://7e74f34e.windmill.pages.dev
Branch Preview URL:	https://changelog-update-17269650556.windmill.pages.dev

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1. frontend/src/lib/components/sidebar/changelogs.ts:8

• Draft comment:
  New changelog entry looks good. Verify it fits the descending date order and the URL follows the standard.
• Reason this comment was not posted:
  Confidence changes required: 0% <= threshold 50% None

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