Fix split provider usage stream frames

[pablopunk]

This PR fixes stream usage tracking for proxy responses to ensure that token usage is correctly captured even when the provider's streaming data is fragmented across multiple chunks. It prevents cases where usage could be missed due to line breaks or chunk boundaries occurring in the middle of a frame, including splits inside multibyte characters or when the final frame lacks a trailing newline. The improvement applies consistently across OpenAI, Anthropic, and Google streaming providers, making usage billing more reliable.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
nvm	Ready	Preview, Comment	Jul 15, 2026 3:28pm

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