docs(changelog): add new entries from changelog

[windmill-internal-app]

This PR adds new changelog entries.

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Summary by cubic

Add the “Asset freshness with fresh/stale badge and automatic watchdog” entry to the sidebar changelogs so users can access the latest update. Includes link to https://www.windmill.dev/changelog/asset-freshness and date 2026-07-04.

^{Written for commit 82266ed. Summary will update on new commits.}

[cloudflare-workers-and-pages]

Deploying windmill with    Cloudflare Pages

Latest commit:	82266ed
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Branch Preview URL:	https://changelog-update-28736982196.windmill.pages.dev

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[github-actions]

Pi Review

Good to merge

This PR adds a single new changelog entry ("Asset freshness with fresh/stale badge and automatic watchdog") to frontend/src/lib/components/sidebar/changelogs.ts. The entry follows the existing Changelog type structure (label / href / date) and fits cleanly alongside the rest of the list. No code, logic, or public API surface is altered.

Test coverage: This is a config-only change (changelog data list). No automated tests are expected for this kind of change. Manual verification consists of confirming the new entry appears in the sidebar changelog dropdown.

[github-actions]

Codex Review

cc @windmill-internal-app[bot]

Mergeable, but should ideally address nits: broken changelog link in changelogs.ts

Found 1 issue:

1. [P2] Broken changelog link in changelogs.ts
frontend/src/lib/components/sidebar/changelogs.ts:10
   The newly added sidebar changelog entry links to https://www.windmill.dev/changelog/asset-freshness, but that URL currently returns HTTP 404 for both slash and no-slash variants. Existing neighboring changelog URLs return 200, so this would surface as a broken user-facing link when clicked.

Test coverage

Frontend-only changelog data change; no automated tests are expected for this file.

Manual verification needed: open the Windmill sidebar changelog menu, click the new “Asset freshness with fresh/stale badge and automatic watchdog” entry, and confirm it resolves to the intended published changelog page rather than a 404.