Extends conversion logic to handle Base64-encoded images (e.g., from clipboard).
Previously, unsupported formats like HEIC/RAW/PSD in Base64 form bypassed
the conversion check and caused failures at multimodal-looker agent.
Changes:
- Add convertBase64ImageToJpeg() function in image-converter.ts
- Save Base64 data to temp file, convert, read back as Base64
- Update tools.ts to check and convert Base64 images when needed
- Ensure proper cleanup of all temporary files
Testing:
- All tests pass (29/29)
- Verified with 1.7MB HEIC file converted from Base64
- Type checking passes
XIN PENG
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