Remove dead code in app and XBRL loader

hooks/use-task-poller.ts

@@ -1,64 +0,0 @@
-'use client';
-
-import { useEffect, useRef, useState } from 'react';
-import { getTask } from '@/lib/api';
-import type { Task } from '@/lib/types';
-
-type UseTaskPollerInput = {
-  taskId: string | null;
-  intervalMs?: number;
-  onTerminalState?: (task: Task) => void;
-};
-
-export function useTaskPoller({ taskId, intervalMs = 2200, onTerminalState }: UseTaskPollerInput) {
-  const [task, setTask] = useState<Task | null>(null);
-  const onTerminalStateRef = useRef(onTerminalState);
-
-  useEffect(() => {
-    onTerminalStateRef.current = onTerminalState;
-  }, [onTerminalState]);
-
-  useEffect(() => {
-    if (!taskId) {
-      setTask(null);
-      return;
-    }
-
-    let stopped = false;
-    let timer: ReturnType<typeof setTimeout> | null = null;
-
-    const poll = async () => {
-      try {
-        const { task: latest } = await getTask(taskId);
-
-        if (stopped) {
-          return;
-        }
-
-        setTask(latest);
-
-        if (latest.status === 'completed' || latest.status === 'failed') {
-          onTerminalStateRef.current?.(latest);
-          return;
-        }
-      } catch {
-        if (stopped) {
-          return;
-        }
-      }
-
-      timer = setTimeout(poll, intervalMs);
-    };
-
-    void poll();
-
-    return () => {
-      stopped = true;
-      if (timer) {
-        clearTimeout(timer);
-      }
-    };
-  }, [taskId, intervalMs]);
-
-  return task;
-}