Simplify chat route: passthrough SSE stream#4
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Replace the decode-then-reencode pattern with a raw fetch passthrough. The API route now forwards the LangGraph SSE stream directly to the client without deserializing and re-serializing each chunk. Use eventsource-parser on the client to handle raw SSE parsing, replacing the manual line-by-line parser. Closes #3 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
chat/route.tswith a rawfetchpassthrough — the LangGraph SSE stream is forwarded directly to the client without deserializationeventsource-parseron the client to parse the raw SSE format, replacing the manual line-by-line parserroute.tsfrom 113 lines to 65 lines (-48 lines, -56 insertions net)Test plan
yarn build)updateseventsCloses #3
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