fix: default adminPages and dashboardWidgets to empty arrays in manifest

[Vallhalen]

Summary

• Adds ?? [] fallback for adminPages and dashboardWidgets in all three manifest code paths (node_modules plugins, sandboxed plugins, marketplace plugins)
• Prevents admin UI crash when a plugin descriptor doesn't explicitly declare these properties

Context

While debugging a separate plugin bug (wrong Block Kit property name), we discovered that emdash-runtime.ts passes undefined to the admin manifest when plugins omit adminPages/adminWidgets. The admin components (Sidebar.tsx, Dashboard.tsx) already guard with if (config.adminPages && ...), but this defensive fix ensures the manifest always contains arrays.

Changes

One file: packages/core/src/emdash-runtime.ts — 6 lines changed (3 locations)

Test plan

• Build passes
• Admin loads with plugins that have adminPages
• Admin loads with plugins that omit adminPages

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: 1c28d47

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

This PR includes changesets to release 9 packages

Name	Type
emdash	Patch
@emdash-cms/cloudflare	Patch
@emdash-cms/plugin-ai-moderation	Patch
@emdash-cms/plugin-atproto	Patch
@emdash-cms/plugin-audit-log	Patch
@emdash-cms/plugin-color	Patch
@emdash-cms/plugin-embeds	Patch
@emdash-cms/plugin-forms	Patch
@emdash-cms/plugin-webhook-notifier	Patch

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[github-actions]

All contributors have signed the CLA ✍️ ✅
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[Vallhalen]

I have read the CLA Document and I hereby sign the CLA

[ascorbic]

Thanks!

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commit: 1c28d47