fix: improve image URL parsing robustness across providers

[dcs-soni]

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Description

Handle malformed data URLs in Bedrock, Anthropic, Gemini, and Ollama adapters. Currently, they use unsafe array destructuring when parsing data URLs causing runtime crashes on malformed input or unexpected results even if the parsed data is not correct base64.

Data URLs can be malformed due to various reasons, like, copy/paste from applications generating invalid URLs, user provided code containing malformed base64 URLs or maybe a network connection during image uploads.

This fix:

• Prevents runtime crashes on malformed image data.
• Improves error handling and user experience.
• Improved response from the providers if the image URLs are malformed.

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• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Summary by cubic

Improves image data URL parsing across Anthropic, Bedrock, Gemini, and Ollama to prevent crashes on malformed input and return clearer errors.

• Bug Fixes
  • Validate the comma separator in data URLs and throw a descriptive error if missing.
  • Extract base64 by joining all parts after the first comma to avoid unsafe array destructuring.
  • Apply consistent parsing in both core LLM implementations and OpenAI adapter APIs (Anthropic, Bedrock).

[github-actions]

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I have read the CLA Document and I hereby sign the CLA

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[dcs-soni]

recheck

[Patrick-Erichsen]

Thanks for the contribution! Logic looks good but lets pull this out into a common util somewhere to prevent code duplication

[dcs-soni]

Thanks for the contribution! Logic looks good but lets pull this out into a common util somewhere to prevent code duplication

Thank you! Refactored, and I think moving the url parsing logic to core/util/url.ts would be a good idea here, or let me know if you'd prefer somewhere else?

[Patrick-Erichsen]

core/util/url.ts makes sense to me 👍