feat(web): MS23-P2-002 OrchestratorPanel SSE stream component

apps/web/src/components/mission-control/MissionControlLayout.tsx

@@ -2,10 +2,15 @@
 
 import { GlobalAgentRoster } from "@/components/mission-control/GlobalAgentRoster";
 import { MissionControlPanel } from "@/components/mission-control/MissionControlPanel";
+import { useSessions } from "@/hooks/useMissionControl";
 
 const DEFAULT_PANEL_SLOTS = ["panel-1", "panel-2", "panel-3", "panel-4"] as const;
 
 export function MissionControlLayout(): React.JSX.Element {
+  const { sessions } = useSessions();
+
+  const panelSessionIds = [sessions[0]?.id, undefined, undefined, undefined] as const;
+
   return (
     <section className="h-full min-h-0 overflow-hidden" aria-label="Mission Control">
       <div className="grid h-full min-h-0 gap-4 xl:grid-cols-[280px_minmax(0,1fr)]">
@@ -13,7 +18,7 @@ export function MissionControlLayout(): React.JSX.Element {
           <GlobalAgentRoster />
         </aside>
         <main className="h-full min-h-0 overflow-hidden">
-          <MissionControlPanel panels={DEFAULT_PANEL_SLOTS} />
+          <MissionControlPanel panels={DEFAULT_PANEL_SLOTS} panelSessionIds={panelSessionIds} />
         </main>
       </div>
     </section>

apps/web/src/components/mission-control/MissionControlPanel.tsx

@@ -4,14 +4,24 @@ import { OrchestratorPanel } from "@/components/mission-control/OrchestratorPane
 
 interface MissionControlPanelProps {
   panels: readonly string[];
+  panelSessionIds?: readonly (string | undefined)[];
 }
 
-export function MissionControlPanel({ panels }: MissionControlPanelProps): React.JSX.Element {
+export function MissionControlPanel({
+  panels,
+  panelSessionIds,
+}: MissionControlPanelProps): React.JSX.Element {
   return (
     <div className="grid h-full min-h-0 auto-rows-fr grid-cols-1 gap-4 overflow-y-auto pr-1 md:grid-cols-2">
-      {panels.map((panelId) => (
-        <OrchestratorPanel key={panelId} />
-      ))}
+      {panels.map((panelId, index) => {
+        const sessionId = panelSessionIds?.[index];
+
+        if (sessionId === undefined) {
+          return <OrchestratorPanel key={panelId} />;
+        }
+
+        return <OrchestratorPanel key={panelId} sessionId={sessionId} />;
+      })}
     </div>
   );
 }

apps/web/src/components/mission-control/OrchestratorPanel.tsx

@@ -1,15 +1,117 @@
 "use client";
 
+import { useEffect, useRef } from "react";
+import { formatDistanceToNow } from "date-fns";
+import { Badge } from "@/components/ui/badge";
+import type { BadgeVariant } from "@/components/ui/badge";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+import { ScrollArea } from "@/components/ui/scroll-area";
+import {
+  useSessionStream,
+  type MissionControlConnectionStatus,
+  type MissionControlMessageRole,
+} from "@/hooks/useMissionControl";
+
+const ROLE_BADGE_VARIANT: Record<MissionControlMessageRole, BadgeVariant> = {
+  user: "badge-blue",
+  assistant: "status-success",
+  tool: "badge-amber",
+  system: "badge-muted",
+};
+
+const CONNECTION_DOT_CLASS: Record<MissionControlConnectionStatus, string> = {
+  connected: "bg-emerald-500",
+  connecting: "bg-amber-500",
+  error: "bg-red-500",
+};
+
+const CONNECTION_TEXT: Record<MissionControlConnectionStatus, string> = {
+  connected: "Connected",
+  connecting: "Connecting",
+  error: "Error",
+};
+
+export interface OrchestratorPanelProps {
+  sessionId?: string;
+}
+
+function formatRelativeTimestamp(timestamp: string): string {
+  const parsedDate = new Date(timestamp);
+  if (Number.isNaN(parsedDate.getTime())) {
+    return "just now";
+  }
+
+  return formatDistanceToNow(parsedDate, { addSuffix: true });
+}
+
+export function OrchestratorPanel({ sessionId }: OrchestratorPanelProps): React.JSX.Element {
+  const { messages, status, error } = useSessionStream(sessionId ?? "");
+  const bottomAnchorRef = useRef<HTMLDivElement | null>(null);
+
+  useEffect(() => {
+    bottomAnchorRef.current?.scrollIntoView({ block: "end" });
+  }, [messages.length]);
+
+  if (!sessionId) {
+    return (
+      <Card className="flex h-full min-h-[220px] flex-col">
+        <CardHeader>
+          <CardTitle className="text-base">Orchestrator Panel</CardTitle>
+        </CardHeader>
+        <CardContent className="flex flex-1 items-center justify-center text-sm text-muted-foreground">
+          Select an agent to view its stream
+        </CardContent>
+      </Card>
+    );
+  }
 
-export function OrchestratorPanel(): React.JSX.Element {
   return (
     <Card className="flex h-full min-h-[220px] flex-col">
-      <CardHeader>
-        <CardTitle className="text-base">Orchestrator Panel</CardTitle>
+      <CardHeader className="space-y-2">
+        <div className="flex items-center justify-between gap-2">
+          <CardTitle className="text-base">Orchestrator Panel</CardTitle>
+          <div className="flex items-center gap-2 text-xs text-muted-foreground">
+            <span
+              className={`h-2.5 w-2.5 rounded-full ${CONNECTION_DOT_CLASS[status]} ${
+                status === "connecting" ? "animate-pulse" : ""
+              }`}
+              aria-hidden="true"
+            />
+            <span>{CONNECTION_TEXT[status]}</span>
+          </div>
+        </div>
+        <p className="truncate text-xs text-muted-foreground">Session: {sessionId}</p>
       </CardHeader>
-      <CardContent className="flex flex-1 items-center justify-center text-sm text-muted-foreground">
-        Select an agent
+      <CardContent className="flex min-h-0 flex-1 p-0">
+        <ScrollArea className="h-full w-full">
+          <div className="flex min-h-full flex-col gap-3 p-4">
+            {messages.length === 0 ? (
+              <p className="mt-6 text-center text-sm text-muted-foreground">
+                {error ?? "Waiting for messages..."}
+              </p>
+            ) : (
+              messages.map((message) => (
+                <article
+                  key={message.id}
+                  className="rounded-lg border border-border/70 bg-card px-3 py-2"
+                >
+                  <div className="mb-2 flex items-center justify-between gap-2">
+                    <Badge variant={ROLE_BADGE_VARIANT[message.role]} className="uppercase">
+                      {message.role}
+                    </Badge>
+                    <time className="text-xs text-muted-foreground">
+                      {formatRelativeTimestamp(message.timestamp)}
+                    </time>
+                  </div>
+                  <p className="whitespace-pre-wrap break-words text-sm text-foreground">
+                    {message.content}
+                  </p>
+                </article>
+              ))
+            )}
+            <div ref={bottomAnchorRef} />
+          </div>
+        </ScrollArea>
       </CardContent>
     </Card>
   );

apps/web/src/components/ui/scroll-area.tsx

@@ -0,0 +1,15 @@
+import * as React from "react";
+
+export type ScrollAreaProps = React.HTMLAttributes<HTMLDivElement>;
+
+export const ScrollArea = React.forwardRef<HTMLDivElement, ScrollAreaProps>(
+  ({ className = "", children, ...props }, ref) => {
+    return (
+      <div ref={ref} className={`relative overflow-hidden ${className}`} {...props}>
+        <div className="h-full w-full overflow-auto">{children}</div>
+      </div>
+    );
+  }
+);
+
+ScrollArea.displayName = "ScrollArea";