chore: drop unused SWR hooks and dependency

useSchools, useFilters, useMetrics and useSchoolDetails were imported by
nothing and were the only consumers of swr. All data fetching goes through
lib/api.ts on the server.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

nextjs-app/hooks/useFilters.ts

@@ -1,29 +0,0 @@
-/**
- * Custom hook for fetching filter options with SWR
- */
-
-'use client';
-
-import useSWR from 'swr';
-import { fetcher } from '@/lib/api';
-import type { FiltersResponse } from '@/lib/types';
-
-export function useFilters() {
-  const { data, error, isLoading } = useSWR<FiltersResponse>(
-    '/filters',
-    fetcher,
-    {
-      revalidateOnFocus: false,
-      dedupingInterval: 60000, // 1 minute
-    }
-  );
-
-  return {
-    filters: data,
-    localAuthorities: data?.local_authorities || [],
-    schoolTypes: data?.school_types || [],
-    years: data?.years || [],
-    isLoading,
-    error,
-  };
-}

nextjs-app/hooks/useMetrics.ts

@@ -1,28 +0,0 @@
-/**
- * Custom hook for fetching metric definitions with SWR
- */
-
-'use client';
-
-import useSWR from 'swr';
-import { fetcher } from '@/lib/api';
-import type { MetricsResponse } from '@/lib/types';
-
-export function useMetrics() {
-  const { data, error, isLoading } = useSWR<MetricsResponse>(
-    '/metrics',
-    fetcher,
-    {
-      revalidateOnFocus: false,
-      dedupingInterval: 60000, // 1 minute
-    }
-  );
-
-  return {
-    metrics: data?.metrics || [],
-    metricsList: data?.metrics || [],
-    getMetric: (key: string) => data?.metrics?.find(m => m.key === key),
-    isLoading,
-    error,
-  };
-}

nextjs-app/hooks/useSchoolDetails.ts

@@ -1,28 +0,0 @@
-/**
- * Custom hook for fetching school details with SWR
- */
-
-'use client';
-
-import useSWR from 'swr';
-import { fetcher } from '@/lib/api';
-import type { SchoolDetailsResponse } from '@/lib/types';
-
-export function useSchoolDetails(urn: number | null) {
-  const { data, error, isLoading, mutate } = useSWR<SchoolDetailsResponse>(
-    urn ? `/schools/${urn}` : null,
-    fetcher,
-    {
-      revalidateOnFocus: false,
-      dedupingInterval: 30000, // 30 seconds
-    }
-  );
-
-  return {
-    schoolInfo: data?.school_info,
-    yearlyData: data?.yearly_data || [],
-    isLoading,
-    error,
-    mutate,
-  };
-}

nextjs-app/hooks/useSchools.ts

@@ -1,46 +0,0 @@
-/**
- * Custom hook for fetching schools with SWR
- */
-
-'use client';
-
-import useSWR from 'swr';
-import { fetcher } from '@/lib/api';
-import type { SchoolsResponse, SchoolSearchParams } from '@/lib/types';
-
-export function useSchools(params: SchoolSearchParams = {}, shouldFetch: boolean = true) {
-  const queryParams = new URLSearchParams();
-
-  Object.entries(params).forEach(([key, value]) => {
-    if (value !== undefined && value !== null && value !== '') {
-      queryParams.set(key, String(value));
-    }
-  });
-
-  const queryString = queryParams.toString();
-  const url = `/schools${queryString ? `?${queryString}` : ''}`;
-
-  const { data, error, isLoading, mutate } = useSWR<SchoolsResponse>(
-    shouldFetch ? url : null,
-    fetcher,
-    {
-      revalidateOnFocus: false,
-      dedupingInterval: 5000, // 5 seconds
-    }
-  );
-
-  return {
-    schools: data?.schools || [],
-    pagination: data ? {
-      page: data.page,
-      page_size: data.page_size,
-      total: data.total,
-      total_pages: data.total_pages,
-    } : null,
-    searchMode: data?.search_mode,
-    locationInfo: data?.location_info,
-    isLoading,
-    error,
-    mutate,
-  };
-}