Add Project Files section and show company name for external users on project detail

supabase/migrations/20260513200000_external_delivery_access.sql

@@ -0,0 +1,13 @@
+-- Allow external users to insert/update deliveries (upsert) and insert delivery_files
+create policy "External inserts deliveries" on public.deliveries
+  for insert with check (get_my_role() = 'external');
+
+create policy "External updates deliveries" on public.deliveries
+  for update using (get_my_role() = 'external');
+
+create policy "External inserts delivery_files" on public.delivery_files
+  for insert with check (get_my_role() = 'external');
+
+-- Allow external users to upload to deliveries storage bucket
+create policy "External inserts deliveries storage" on storage.objects
+  for insert to authenticated with check (bucket_id = 'deliveries' and get_my_role() = 'external');