Fix type errors and data service issues

- Corrected `useDataService.ts` useEffect hook return type.
- Fixed `Index.tsx` type error related to `IndTransactionRecord`.
- Addressed type incompatibility in `dataService.ts` for bill of materials.
- Removed the attempted deletion of the non-existent `jobDataService.ts` file.

src/hooks/useDataService.ts

@@ -27,7 +27,9 @@ export function useJobs() {
       setJobs(dataService.getJobs());
     });
 
-    return unsubscribe;
+    return () => {
+      unsubscribe();
+    };
   }, []);
 
   return {
@@ -62,7 +64,9 @@ export function useJob(jobId: string | null) {
     updateJob();
 
     const unsubscribe = dataService.subscribe(updateJob);
-    return unsubscribe;
+    return () => {
+      unsubscribe();
+    };
   }, [jobId]);
 
   return job;

src/pages/Index.tsx

@@ -1,8 +1,9 @@
+
 import { useState } from 'react';
 import { Button } from '@/components/ui/button';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
 import { Plus, Factory, TrendingUp, Briefcase, FileText } from 'lucide-react';
-import { IndTransactionRecordNoId, IndJobRecordNoId, IndJobStatusOptions } from '@/lib/pbtypes';
+import { IndTransactionRecordNoId, IndJobRecordNoId, IndJobStatusOptions, IndTransactionRecord } from '@/lib/pbtypes';
 import { formatISK } from '@/utils/priceUtils';
 import JobCard from '@/components/JobCard';
 import JobForm from '@/components/JobForm';