Fix file sharing load speed and move error; misc updates

- Remove recursive directory size calculations (single Seafile API call per list)
- Remove 'Used in this location' usage display
- Fix move using v2 per-type endpoints instead of broken batch endpoint
- Send entry type from frontend for correct move routing

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

supabase/migrations/20260409120100_add_revision_billing.sql

@@ -0,0 +1,23 @@
+alter table public.submissions
+  add column if not exists revision_type text;
+
+do $$
+begin
+  if not exists (
+    select 1
+    from pg_constraint
+    where conname = 'submissions_revision_type_check'
+      and conrelid = 'public.submissions'::regclass
+  ) then
+    alter table public.submissions
+      add constraint submissions_revision_type_check
+      check (revision_type in ('fourge_error', 'client_revision'));
+  end if;
+end;
+$$;
+
+alter table public.submissions
+  add column if not exists invoiced boolean not null default false;
+
+alter table public.invoice_items
+  add column if not exists submission_id uuid references public.submissions(id) on delete set null;