fix(admin): accept relative URLs in menu editor

[tsikatawill]

What does this PR do?

The menu editor's URL input used type="url", which triggers browser validation requiring a full URL with scheme. This rejected relative paths like /about or /blog, which are the most common use case for internal menu links.

Changes type="url" to type="text" with a pattern attribute that accepts:

• Absolute URLs: https://example.com, http://example.com/path
• Relative paths: /about, /blog/post-1, /

And rejects invalid values like bare domains (example.com) or schemeless input (about).

Both the add form and edit form inputs are updated.

Closes #342

Type of change

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

Checklist

• I have read CONTRIBUTING.md
• pnpm typecheck passes
• pnpm --silent lint:json | jq '.diagnostics | length' returns 0
• pnpm test passes (or targeted tests for my change)
• pnpm format has been run
• I have added/updated tests for my changes (if applicable)
• I have added a changeset (if this PR changes a published package)
• New features link to an approved Discussion: https://github.com/emdash-cms/emdash/discussions/...

AI-generated code disclosure

• This PR includes AI-generated code

Screenshots / test output

 ✓ URL input accepts relative paths
 ✓ URL input accepts absolute https URLs
 ✓ URL input rejects bare domains without scheme

[changeset-bot]

🦋 Changeset detected

Latest commit: 780713e

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

This PR includes changesets to release 10 packages

Name	Type
@emdash-cms/admin	Patch
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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Click here if you're a maintainer who wants to add another changeset to this PR

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commit: 780713e

[ascorbic]

Most of this was fixed in another PR, but the form updates are a good fix so I'll merge this too