chore/fix: parse correct message for anywidget

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📝 Summary

anywidgets were logging a lot of errors when I tested with Quak & mosaic. Although nothing was broken with quak.

Failed to parse message ZodError: [
  {
    "code": "invalid_union_discriminator",
    "options": [
      "open",
      "update",
      "custom",
      "echo_update",
      "close"
    ],
    "path": [
      "method"
    ],
    "message": "Invalid discriminator value. Expected 'open' | 'update' | 'custom' | 'echo_update' | 'close'"
  }
]

It's because we are trying to parse the message's content rather than the entire message. The following is the content, which does not have the 'method' field.

Message
{
    "type": "arrow",
    "uuid": "160ab694-ef1f-475a-b108-adc3fee81267"
}

🔍 Description of Changes

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

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Name	Status	Preview	Comments	Updated (UTC)
marimo-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 24, 2025 0:21am