feat(web): React SPA with realtime task detail over WebSocket

Vite + React 19 + TS console-style operator UI: hash-routed Login,
Endpoints, Tasks, and TaskDetail (realtime accounts table over /ws,
Run gated on all accounts testing ok on both sides).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMHQTtnQtQqL8muAXHr9kd

web/src/ws.ts

@@ -0,0 +1,30 @@
+// Live task event stream. One socket per task-detail view.
+
+export type TaskEventType =
+  | 'run_started'
+  | 'account_started'
+  | 'account_test'
+  | 'progress'
+  | 'account_done'
+  | 'error'
+  | 'run_done'
+  | string
+
+export interface TaskEvent {
+  type: TaskEventType
+  task_id: number
+  data: unknown
+}
+
+export function connectTaskWS(taskId: number, onEvent: (ev: TaskEvent) => void): () => void {
+  const proto = location.protocol === 'https:' ? 'wss' : 'ws'
+  const ws = new WebSocket(`${proto}://${location.host}/ws?task_id=${taskId}`)
+  ws.onmessage = (m) => {
+    try {
+      onEvent(JSON.parse(m.data))
+    } catch {
+      // ignore malformed frames
+    }
+  }
+  return () => ws.close()
+}