feat(web): add history fork for conversations#281
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Let users branch a conversation from any prior user message into a new session that carries the history up to the fork point and pre-fills the forked prompt into the composer for editing and re-sending. - gateway: new fork_session RPC wired through protocol types, in-process and remote gateway clients, ws dispatch, and local gateway impl - server: forkSession truncates the source transcript at the fork turn, writes a new session jsonl with fork lineage metadata, copies aux dirs, and returns the prefill text + carried message count - session: persist parentSessionId/forkedFromTurnId so the sidebar can render the fork lineage tree - ui: hover Fork button on user messages, auto-navigate to the new session, prefill + focus the composer, scroll to bottom, distinctive fork titles, and a friendly empty state for branches with no carried history - tests: forkSession unit test + history-fork e2e spec Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
fork_sessionRPC（protocol 类型 / InProcess + Remote 客户端 / ws dispatch / 本地网关实现）。forkSession在分叉 turn 处截断源 transcript，写入带分叉谱系 metadata 的新会话 jsonl，复制tool-results/file-history辅助目录，并返回预填文本与携带消息数。parentSessionId/forkedFromTurnId，侧栏据此渲染分叉谱系树。⑂ <分叉点消息>命名增强区分度；对无携带历史的分支提供友好空态。Changes
protocol/types.ts,protocol/frames.ts,client/InProcessGateway.ts,client/RemoteGateway.ts,server/GatewayWsConnection.ts,cli/createLocalGateway.ts,cli/pilotdeck.tsweb/server/forkSession.ts（新增）,web/server/readSessionMessages.ts,web/client/protocol.ts,web/client/webMessage.tssession/transcript/TranscriptEntry.ts,session/storage/SessionList.tsui/server/routes/messages.js（POST /api/sessions/:id/fork）,ui/server/projects.jsChatInterfaceV2.tsx,MessageRowV2.tsx,MessagesPaneV2.tsx,SidebarV2.tsx,useChatMessages.ts,types.ts,useSessionStore.ts,api.jstests/web/forkSession.test.ts,ui/e2e/history-fork.spec.mjsTest plan
tests/web/forkSession.test.ts通过newSessionId、prefillText、carriedMessageCount；新 transcript 携带完整历史、谱系 metadata 正确、标题为⑂ <消息>⑂的分叉条目、无 "Fork did not return a new session id" 报错Made with Cursor