fix(admin): preserve EmDash footer product attribution

[logelog]

What does this PR do?

Keeps the admin sidebar footer tied to the EmDash product identity instead of replacing it with a site's configured white-label name.

The configured site name still belongs in the admin header. The footer now deterministically renders EmDash CMS v<version> (<commit>), with a stable version fallback when build metadata is unavailable.

Root cause: the footer reused manifest.admin.siteName, which is site branding rather than CMS product attribution.

Type of change

• Bug fix
• Feature (requires maintainer-approved Discussion)
• Refactor (no behavior change)
• Translation
• Documentation
• Performance improvement
• Tests
• Chore (dependencies, CI, tooling)

Checklist

• I have read CONTRIBUTING.md
• pnpm typecheck passes
• pnpm lint passes
• pnpm test passes (or targeted tests for my change)
• pnpm format has been run
• I have added/updated tests for my changes (if applicable)
• User-visible strings in the admin UI are wrapped for translation (if applicable). Do not include messages.po changes except in translation PRs — a workflow extracts catalogs on merge to main.
• I have added a changeset (if this PR changes a published package)
• New features link to an approved Discussion: not applicable (bug fix)

Screenshots / test output

• @emdash-cms/admin typecheck (tsgo --noEmit): passed
• Targeted Oxlint on the changed TypeScript files: 0 warnings, 0 errors
• Oxfmt check on the changed TypeScript files: passed
• git diff --check: passed
• Added two focused formatAdminFooter regression tests. The local browser runner could not execute them because this isolated worktree has stale Vitest 4.1.5 dependencies while the current lockfile expects @vitest/browser 4.1.9; the draft PR CI will run from a clean install.

The diff contains no site-specific branding or private plugin code.

[changeset-bot]

🦋 Changeset detected

Latest commit: 946991b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 17 packages

Name	Type
@emdash-cms/admin	Patch
emdash	Patch
@emdash-cms/cloudflare	Patch
@emdash-cms/sandbox-workerd	Patch
@emdash-cms/plugin-mcp-smoke	Patch
@emdash-cms/fixture-perf-site	Patch
@emdash-cms/perf-demo-site	Patch
@emdash-cms/cache-demo-site	Patch
@emdash-cms/do-demo-site	Patch
@emdash-cms/do-solo-demo-site	Patch
@emdash-cms/auth	Patch
@emdash-cms/blocks	Patch
@emdash-cms/gutenberg-to-portable-text	Patch
@emdash-cms/x402	Patch
create-emdash	Patch
@emdash-cms/auth-atproto	Patch
@emdash-cms/plugin-embeds	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[logelog]

recheck

[MA2153]

This would undo #705

[ascorbic]

recheck

[ascorbic]

I think the best is somewhere in between. Maybe don't replace it with the site name by default, but allow that as an option

[pkg-pr-new]

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@emdash-cms/plugin-field-kit

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@emdash-cms/plugin-forms

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@emdash-cms/plugin-webhook-notifier

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commit: 946991b

[ascorbic]

If somebody would like to make the change I suggested (a separate config option to replace the footer attribution) then that would be welcome