fix: apply Mongoid 8 any_of fixes to activity_view_model and tax/rate

- admin/activity_view_model.rb: collect any_of clauses into array and
  call any_of(*clauses) once outside the loop; avoids AND-of-ORs in
  Mongoid 8 when multiple IDs are provided (WA-VERIFY-091)
- core/tax/rate.rb: splat clauses array in any_of call to match Mongoid
  8 variadic signature (WA-VERIFY-091)

Note: branch also includes WA-VERIFY-089 count→size changes from prior commit.

Author: Kit (OpenClaw)

admin/app/view_models/workarea/admin/activity_view_model.rb

@@ -60,12 +60,13 @@ def scoped_entries
         end
 
         if options[:id].present?
-          Array(options[:id]).each do |id|
-            criteria = criteria.any_of(
+          clauses = Array(options[:id]).flat_map do |id|
+            [
               { audited_id: id },
               { 'document_path.id' => convert_to_object_id(id) }
-            )
+            ]
           end
+          criteria = criteria.any_of(*clauses) unless clauses.empty?
         end
 
         if options[:created_at_greater_than].present?

core/app/models/workarea/tax/rate.rb

@@ -43,7 +43,7 @@ def self.search(query)
         clauses = [{ region: regex }, { postal_code: regex }]
         clauses << { country: country } if country.present?
 
-        any_of(clauses)
+        any_of(*clauses)
       end
 
       def self.sorts