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 “Workspace forks on Windmill Cloud” entry to the sidebar changelog list. Includes the link https://www.windmill.dev/changelog/workspace-forks-on-cloud and date 2026-07-02 so the latest update shows in-app.

^{Written for commit 859213d. Summary will update on new commits.}

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Latest commit:	859213d
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Branch Preview URL:	https://changelog-update-28665612395.windmill.pages.dev

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[github-actions]

Pi Review

Good to merge

This is a straightforward changelog entry addition — one new object inserted at the top of the changelogs array in frontend/src/lib/components/sidebar/changelogs.ts. The entry follows the existing Changelog type (label, href, date), uses the same date format as every other entry, and is placed in correct reverse-chronological order (newest first, above the 2025-11-19 entry). No code logic is changed.

Test coverage: CI / docs-only change — no automated tests expected.

[github-actions]

Codex Review

cc @windmill-internal-app[bot]

Mergeable, but should ideally address nits: broken changelog link

Found 1 issue:

1. [P2] Broken changelog link in latest sidebar entry
   frontend/src/lib/components/sidebar/changelogs.ts:10

   The new sidebar changelog entry points to https://www.windmill.dev/changelog/workspace-forks-on-cloud, which currently returns HTTP 404. SidebarContent.svelte renders changelog.href directly in the “Latest changelogs” menu, so users clicking this new entry will land on a dead page. Please either publish/correct the target slug before merging or point this entry at the valid changelog URL.

Test coverage

Frontend-only static changelog data change; no automated component tests are expected for this layer.

Manual verification still needed: open the sidebar changelog menu and click “Workspace forks on Windmill Cloud”; the new tab should load the intended changelog page rather than a 404.