fix(workers-ai-provider): image generation

[notreux]

Description

This PR addresses an issue where image generation would fail if the Workers AI binding returned anything other than a ReadableStream.

Changes:

• Refactored WorkersAIImageModel.doGenerate to handle polymorphic return types from the binding.
• Introduced a toUint8Array helper function that safely converts the following inputs into Uint8Array:
  • ReadableStream (existing behavior)
  • Uint8Array / ArrayBuffer
  • JSON response with Base64 ({ image: string }).
• Added unit tests for image generation (previously missing) to verify these scenarios.

Related Issue

Fixes #272

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🦋 Changeset detected

Latest commit: 97b79e2

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

This PR includes changesets to release 1 package

Name	Type
workers-ai-provider	Patch

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commit: 97b79e2