Fix base64 deserialization when JSON encoder escapes forward slashes#1342

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stephentoub merged 9 commits intomainfrom

copilot/fix-imagecontentblock-base64-error

Feb 23, 2026

Commits on Feb 21, 2026

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Fix base64 deserialization with JSON-escaped data in ImageContentBlock, AudioContentBlock, and BlobResourceContents

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Commits on Feb 23, 2026

Use reader.GetBytesFromBase64() with FromBytes() for escaped base64 data

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Make FromBytes lazy: defer base64 encoding until Data/Blob is accessed

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Add comprehensive base64 roundtripping tests for all protocol types

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Fix base64 comment: 0xFB,0xEF,0xBE encodes to "++++", not "+++"

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Add comprehensive AIContent roundtrip tests for all base64 protocol types

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Consolidate AIContent roundtrip tests: combine separate tests, remove duplicative ones

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Deduplicate Base64TestData: reference ContentBlockTests.Base64TestData from ResourceContentsTests and AIContentExtensionsTests

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