BUGFIX: Add baseBuilder property in MiniAppManifest type and let it include in withValidManifest

[silmin]

What changed? Why?
Resolved #2512
On the miniapp registration page on base.dev, you’re required to add baseBuilders.ownerAddress to manifest.json, but it’s being omitted by withValidManifest().

Added baseBuilder field support to MiniAppManifest.

• Added new BaseBuilderFields type with ownerAddress as a required field
• Implemented baseBuilder validation in withValidManifest function
  • Only includes baseBuilder in manifest when ownerAddress is present
  • Logs a warning and omits from manifest when invalid

Notes to reviewers
Follows the same validation pattern as accountAssociation. When baseBuilder is provided but ownerAddress is empty/undefined, it logs a warning and omits from the manifest.

How has it been tested?
Added unit tests for baseBuilder handling:

• Verifies omission when ownerAddress is undefined/empty string
• Verifies no warning when baseBuilder is not provided
• Verifies inclusion when valid ownerAddress is present
• Verifies accountAssociation and baseBuilder can coexist

[vercel]

@silmin is attempting to deploy a commit to the Coinbase Team on Vercel.

A member of the Team first needs to authorize it.

[cb-heimdall]

🟡 Heimdall Review Status

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