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LEAP : STEP;\n\t\t\t\t// A rail on the right grows leftward, so the key names a direction\n\t\t\t\t// on the screen rather than a direction in the layout.\n\t\t\t\tlet toward = side === \"left\" ? 1 : -1;\n\n\t\t\t\tif (event.key === \"ArrowRight\") onResize(step * toward);\n\t\t\t\telse if (event.key === \"ArrowLeft\") onResize(-step * toward);\n\t\t\t\telse if (event.key === \"Home\") onResize(MIN - width);\n\t\t\t\telse if (event.key === \"End\") onResize(MAX - width);\n\t\t\t\telse return;\n\n\t\t\t\tevent.preventDefault();\n\t\t\t}}\n\t\t\tonPointerDown={event => {\n\t\t\t\torigin.current = event.clientX;\n\t\t\t\tsetDragging(true);\n\t\t\t\tevent.currentTarget.setPointerCapture(event.pointerId);\n\t\t\t}}\n\t\t\tonPointerMove={event => {\n\t\t\t\tif (!event.currentTarget.hasPointerCapture(event.pointerId)) return;\n\t\t\t\tlet delta = event.clientX - origin.current;\n\t\t\t\torigin.current = event.clientX;\n\t\t\t\tonResize(side === \"left\" ? delta : -delta);\n\t\t\t}}\n\t\t\t// Lost capture covers ordinary release and every form of pointer cancellation.\n\t\t\tonLostPointerCapture={() => setDragging(false)}\n\t\t\trole=\"separator\"\n\t\t\ttabIndex={0}\n\t\t/>\n\t);\n}\n\nfunction usePaneWidth(key: string, initial: number, active: boolean) {\n\tlet [width, setWidth] = useState(initial);\n\tlet loaded = useRef(false);\n\n\tuseEffect(() => {\n\t\tif (!active) return;\n\t\tif (!loaded.current) {\n\t\t\tloaded.current = true;\n\t\t\tlet stored = Number(localStorage.getItem(key));\n\t\t\tlet restored = Number.isFinite(stored) && stored > 0 ? clamp(stored) : initial;\n\t\t\tif (restored !== width) {\n\t\t\t\tsetWidth(restored);\n\t\t\t\treturn;\n\t\t\t}\n\t\t}\n\t\tlocalStorage.setItem(key, String(width));\n\t}, [active, initial, key, width]);\n\n\tlet resize = useCallback((delta: number) => setWidth(current => clamp(current + delta)), []);\n\treturn [width, resize] as const;\n}\n\nexport type Pane = \"chat\";\n\nexport function paneId(pane: Pane): string {\n\treturn `pane-${pane}`;\n}\n\nfunction currentMode(): WorkspaceMode {\n\treturn workspaceMode(matchMedia);\n}\n\nfunction subscribeMode(notify: () => void): () => void {\n\tlet queries = WORKSPACE_MEDIA.map(matchMedia);\n\tfor (let query of queries) query.addEventListener(\"change\", notify);\n\treturn () => {\n\t\tfor (let query of queries) query.removeEventListener(\"change\", notify);\n\t};\n}\n\n/** Read CSS width atomically so a render cannot contain two workspace modes. */\nexport function useWorkspaceMode(): WorkspaceMode {\n\treturn useSyncExternalStore(subscribeMode, currentMode, currentMode);\n}\n\n/** Only the desktop Conversation preference crosses a page load. */\nexport function useWorkspaceState(): [WorkspaceState, Dispatch] {\n\tlet [state, dispatch] = useReducer(transitionWorkspace, undefined, (): WorkspaceState => ({\n\t\tconversationOpen: false,\n\t\tdesktopConversationOpen: localStorage.getItem(\"chopin:pane:chat:open\") !== \"false\",\n\t}));\n\n\tuseEffect(() => {\n\t\tlocalStorage.setItem(\n\t\t\t\"chopin:pane:chat:open\",\n\t\t\tString(state.desktopConversationOpen),\n\t\t);\n\t}, [state.desktopConversationOpen]);\n\n\treturn [state, dispatch];\n}\n\nexport type WorkspaceProps = {\n\theader: ReactNode;\n\tchat?: ReactNode;\n\tplan: ReactNode;\n\tdecisions: ReactNode;\n\tcontrols: ReactNode;\n\tmode: WorkspaceMode;\n\tstate: WorkspaceState;\n\tview: \"plan\" | \"decisions\";\n\tonConversationOpen: (open: boolean) => void;\n\tonDesktopConversationOpen: (open: boolean) => void;\n\tonDestination: (destination: \"plan\" | \"decisions\") => void;\n\tunanswered: number;\n\tconversationActivity: { unread: number; busy: boolean };\n};\n\nfunction ConversationToggle(\n\t{\n\t\tactivity,\n\t\tbuttonRef,\n\t\tclassName,\n\t\tonToggle,\n\t\topen,\n\t}: {\n\t\tactivity: WorkspaceProps[\"conversationActivity\"];\n\t\tbuttonRef?: RefObject;\n\t\tclassName?: string;\n\t\tonToggle: () => void;\n\t\topen: boolean;\n\t},\n) {\n\tlet status = activity.busy\n\t\t? \"Planner working\"\n\t\t: activity.unread > 0\n\t\t? `${activity.unread} unread`\n\t\t: undefined;\n\treturn (\n\t\t 0 ? \"unread\" : undefined}\n\t\t\tonClick={onToggle}\n\t\t\tref={buttonRef}\n\t\t\ttype=\"button\"\n\t\t>\n\t\t\t\n\t\t\t{status && (\n\t\t\t\t\n\t\t\t)}\n\t\t\n\t);\n}\n\nconst HEADING: Record = {\n\tplan: \"workspace-plan-heading\",\n\tdecisions: \"workspace-decisions-heading\",\n\tconversation: \"workspace-conversation-heading\",\n};\n\nfunction destinationLabel(\n\tdestination: WorkspaceDestination,\n\tunanswered: number,\n\tactivity: WorkspaceProps[\"conversationActivity\"],\n): string {\n\tif (destination === \"decisions\" && unanswered > 0) {\n\t\treturn `Decisions, ${unanswered} unanswered`;\n\t}\n\tif (destination === \"conversation\" && activity.busy && activity.unread > 0) {\n\t\treturn `Conversation, Planner working, ${activity.unread} unread`;\n\t}\n\tif (destination === \"conversation\" && activity.busy) return \"Conversation, Planner working\";\n\tif (destination === \"conversation\" && activity.unread > 0) {\n\t\treturn `Conversation, ${activity.unread} unread`;\n\t}\n\treturn destination === \"conversation\" ? \"Conversation\" : destination === \"decisions\"\n\t\t? \"Decisions\"\n\t\t: \"Plan\";\n}\n\nexport function Workspace(\n\t{\n\t\tchat,\n\t\tcontrols,\n\t\tconversationActivity,\n\t\tdecisions,\n\t\theader,\n\t\tmode,\n\t\tonConversationOpen,\n\t\tonDesktopConversationOpen,\n\t\tonDestination,\n\t\tplan,\n\t\tstate,\n\t\tunanswered,\n\t\tview,\n\t}: WorkspaceProps,\n) {\n\tlet [chatWidth, resizeChat] = usePaneWidth(\"chopin:pane:chat\", 280, mode === \"split\");\n\tlet presentation = presentWorkspace(state, mode, view);\n\tlet opener = useRef(undefined);\n\tlet edgeTab = useRef(null);\n\tlet previousConversationOpen = useRef(state.conversationOpen);\n\tlet conversationHidden = !presentation.conversationVisible;\n\tlet planHidden = !presentation.documentVisible || presentation.documentView !== \"plan\";\n\tlet decisionsHidden = !presentation.documentVisible\n\t\t|| presentation.documentView !== \"decisions\";\n\tlet destinations: WorkspaceDestination[] = [\"conversation\", \"plan\", \"decisions\"];\n\n\tuseLayoutEffect(() => {\n\t\tif (!previousConversationOpen.current && state.conversationOpen) {\n\t\t\tlet active = document.activeElement;\n\t\t\tif (active instanceof HTMLElement) opener.current = active;\n\t\t\tif (mode !== \"split\") {\n\t\t\t\tdocument.getElementById(HEADING.conversation)?.focus({ preventScroll: true });\n\t\t\t}\n\t\t}\n\t\tpreviousConversationOpen.current = state.conversationOpen;\n\t}, [mode, state.conversationOpen]);\n\n\tlet navigate = (destination: WorkspaceDestination, source?: HTMLElement) => {\n\t\tif (destination === \"conversation\" && source) opener.current = source;\n\t\tif (destination === \"conversation\") onConversationOpen(true);\n\t\telse onDestination(destination);\n\t\trequestAnimationFrame(() => {\n\t\t\tdocument.getElementById(HEADING[destination])?.focus({ preventScroll: true });\n\t\t});\n\t};\n\n\tlet dismissConversation = () => {\n\t\tif (mode === \"split\") {\n\t\t\tonDesktopConversationOpen(false);\n\t\t\trequestAnimationFrame(() => edgeTab.current?.focus({ preventScroll: true }));\n\t\t} else {\n\t\t\tonConversationOpen(false);\n\t\t\trequestAnimationFrame(() => opener.current?.focus({ preventScroll: true }));\n\t\t}\n\t};\n\n\tlet showDesktopConversation = () => {\n\t\tonDesktopConversationOpen(true);\n\t\trequestAnimationFrame(() => {\n\t\t\tdocument.getElementById(HEADING.conversation)?.focus({ preventScroll: true });\n\t\t});\n\t};\n\n\treturn (\n\t\t

\n\t\t\t{header}\n\n\t\t\t\n\t\t\t\t{/* `hidden` preserves pane state and subscriptions while removing it from layout. */}\n\t\t\t\t{chat && (\n\t\t\t\t\t {\n\t\t\t\t\t\t\tif (event.key === \"Escape\" && mode !== \"split\") {\n\t\t\t\t\t\t\t\tevent.preventDefault();\n\t\t\t\t\t\t\t\tevent.stopPropagation();\n\t\t\t\t\t\t\t\tdismissConversation();\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}}\n\t\t\t\t\t\tstyle={mode === \"split\"\n\t\t\t\t\t\t\t? { width: chatWidth }\n\t\t\t\t\t\t\t: { width: \"100%\" }}\n\t\t\t\t\t>\n\t\t\t\t\t\t{mode === \"split\"\n\t\t\t\t\t\t\t? (\n\t\t\t\t\t\t\t\t

\n\t\t\t\t\t\t\t\t\t

\n\t\t\t\t\t\t\t\t\t\tConversation\n\t\t\t\t\t\t\t\t\t

\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t

\n\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\t:

Conversation

}\n\t\t\t\t\t\t

\n\t\t\t\t\t\t\t{chat}\n\t\t\t\t\t\t

\n\t\t\t\t\t\n\t\t\t\t)}\n\n\t\t\t\t{chat && mode === \"split\" && !presentation.conversationVisible && (\n\t\t\t\t\t

\n\t\t\t\t\t\t\n\t\t\t\t\t

\n\t\t\t\t)}\n\n\t\t\t\t\n\t\t\t\t\t{/* Decoration extends below the viewport without moving the editor contents. */}\n\t\t\t\t\t\n\n\t\t\t\t\t{/* Lexical consumes Tab, so the resize handle precedes the editor. */}\n\t\t\t\t\t{chat && presentation.separatorVisible && (\n\t\t\t\t\t\t\n\t\t\t\t\t)}\n\t\t\t\t\t

\n\t\t\t\t\t\t{mode === \"split\" && (\n\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t

{controls}

\n\t\t\t\t\t\t\t

\n\t\t\t\t\t\t)}\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t

Plan

\n\t\t\t\t\t\t\t{plan}\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t

Decisions

\n\t\t\t\t\t\t\t{decisions}\n\t\t\t\t\t\t\n\t\t\t\t\t

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