feat(web): Study Buddy panel — api, hook, component (AI-038a)#329
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api/studybuddy.ts (runStudyBuddy over SSE + getStudyBuddyRun); useStudyBuddy hook (live steps, answer on done, status, 401->auth); StudyBuddyPanel (passage echo, answer, collapsible step transcript, auth-gated). postSse now sends credentials + maps 401 to SseUnauthorizedError. Reader wiring is AI-038b. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Phase 6 AI-038, slice a — the web UI for the agent: an api client, a streaming hook, and the panel. Wiring it into the reader's selection toolbar is slice b (touches the complex
ReaderPage/ReaderHighlights, kept separate for a reviewable diff).Changes
api/studybuddy.ts—runStudyBuddy(editionId, passage, chapter, callbacks)consumes the AI-037 SSE (step/done/error) viapostSse;getStudyBuddyRun(runId)fetches a persisted run for the "show steps" view.useStudyBuddyhook —stepsgrow live as the agent works,answerlands ondone,status(idle/running/done/error); a new run aborts the in-flight one (and on unmount); 401 surfaces aserror: 'auth'.StudyBuddyPanel— right slide-in panel (mirrorsAskPanel): passage echoed at top, final answer, a spinner while running, and a collapsible step transcript (each step summarized — tool name + ✓/✗, or the model's text /Looking up: …). Auth-gated with a sign-in CTA.lib/sse.ts—postSsenow sendscredentials: 'include'(needed for the authed Study Buddy stream; harmless for the public Explain one) and maps 401 → newSseUnauthorizedError.Verification
useStudyBuddy: step accumulation → answer on done; terminal error keeps the partial steps; 401 →auth; no-op on empty passage / missing edition; reset.postSse: 401 →SseUnauthorizedErrorandcredentials: 'include'sent.tsc --noEmit+pnpm buildclean. The panel renders end-to-end once wired (AI-038b); a live run is exercised on prod / AI-039.🤖 Generated with Claude Code