feat(admin): fall back to the site title for admin branding

[swissky]

What does this PR do?

The admin sidebar header (and the version line in its footer) always shows the hardcoded "EmDash" label unless a build-time admin.siteName is configured. Operators running several EmDash backends can't tell at a glance which site's admin they're in — every tab looks identical.

This adds a WordPress-style fallback in the manifest route: when no explicit admin.siteName is configured, manifest.admin.siteName is filled from the site's own title. Precedence:

build-time admin.siteName → Site Title (Settings → General, site:title) → the title captured by the setup wizard (emdash:site_title) → the bundled "EmDash" default in the SPA

The admin SPA is untouched — the sidebar already renders manifest.admin?.siteName || "EmDash", so the header, footer, and BrandIcon alt text all pick this up automatically. Both option keys are read with a single getMany batch, wrapped in try/catch so a pre-setup database keeps the default. No behavior change for sites that configure admin.siteName or have no title yet.

Complements #1505 (Site Icon as the admin favicon): favicon + sidebar title together make each backend instantly recognizable.

Discussion: #1706

Closes #

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 (emdash package — clean)
• pnpm lint passes (oxlint --type-aware --deny-warnings clean on the changed file)
• pnpm test passes (or targeted tests for my change) — n/a: single manifest-route fallback with no existing route test harness; behavior verified manually
• pnpm format has been run (oxfmt + prettier clean)
• I have added/updated tests for my changes (if applicable) — see above
• User-visible strings in the admin UI are wrapped for translation (if applicable) — n/a, no strings added; no messages.po changes
• I have added a changeset (emdash: minor)
• New features link to an approved Discussion — Show the site title in the admin instead of the generic EmDash mark #1706 (opened for maintainer approval)

AI-generated code disclosure

• This PR includes AI-generated code — model/tool: Cursor + Claude Fable 5

Screenshots / test output

Single-file change in packages/core/src/astro/routes/api/manifest.ts (+ changeset). Reuses the existing OptionsRepository.getMany batch read.

[changeset-bot]

🦋 Changeset detected

Latest commit: 9a479eb

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

This PR includes changesets to release 16 packages

Name	Type
emdash	Minor
@emdash-cms/cloudflare	Minor
@emdash-cms/sandbox-workerd	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/admin	Minor
@emdash-cms/auth	Minor
@emdash-cms/blocks	Minor
@emdash-cms/gutenberg-to-portable-text	Minor
@emdash-cms/x402	Minor
create-emdash	Minor
@emdash-cms/auth-atproto	Patch
@emdash-cms/plugin-embeds	Patch

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commit: 9a479eb

[ascorbic]

Sounds good