WIP: Devinxi css rework

[katywings]

PR Checklist

Please check if your PR fulfills the following requirements:

• Addresses an existing open issue: fixes #000
• Tests for the changes have been added (for bug fixes / features)

Design Goals

1. Consistency between dev/prod
2. Prevent foucs
3. Avoid unused route css
4. Avoid duplicate css

Issues

• Create an example for css testing
• ?url imported css should not be server rendered
• <link> should be mounted before suspension-end during spa navigation
• Suspension from spa navigation should only end after <link> has been loaded
• Assets should be deduplicated on ssr
• Integrate mountAssets in dev (making dev and prod use the same API)
• Public manifest and asset mount API

Known problems:

• 404 page is not server rendered
• app.css gets removed when navigating from /index to /about in css-garden
• <link> is mounted too early on spa navigation - it should wait until resources/createAsync is done

[changeset-bot]

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Latest commit: e07865f

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[pkg-pr-new]

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commit: e07865f