chore: Search optimisations (#6644)

- Strip search term before searching
- order messages by created_at desc
- order contacts by last_activity_at desc
- order conversations by created_at desc
- Search only resolved contacts
- Optimize resolved contacts query

ref: #6583

app/services/search_service.rb

@@ -20,24 +20,31 @@ class SearchService
     @accessable_inbox_ids ||= @current_user.assigned_inboxes.pluck(:id)
   end
 
+  def search_query
+    @search_query ||= params[:q].to_s.strip
+  end
+
   def filter_conversations
     @conversations = current_account.conversations.where(inbox_id: accessable_inbox_ids)
                                     .joins('INNER JOIN contacts ON conversations.contact_id = contacts.id')
                                     .where("cast(conversations.display_id as text) ILIKE :search OR contacts.name ILIKE :search OR contacts.email
-                            ILIKE :search OR contacts.phone_number ILIKE :search OR contacts.identifier ILIKE :search", search: "%#{params[:q]}%")
+                            ILIKE :search OR contacts.phone_number ILIKE :search OR contacts.identifier ILIKE :search", search: "%#{search_query}%")
+                                    .order('conversations.created_at DESC')
                                     .limit(10)
   end
 
   def filter_messages
     @messages = current_account.messages.where(inbox_id: accessable_inbox_ids)
-                               .where('messages.content ILIKE :search', search: "%#{params[:q]}%")
-                               .where('created_at >= ?', 3.months.ago).limit(10)
+                               .where('messages.content ILIKE :search', search: "%#{search_query}%")
+                               .where('created_at >= ?', 3.months.ago)
+                               .reorder('created_at DESC')
+                               .limit(10)
   end
 
   def filter_contacts
     @contacts = current_account.contacts.where(
       "name ILIKE :search OR email ILIKE :search OR phone_number
-      ILIKE :search OR identifier ILIKE :search", search: "%#{params[:q]}%"
-    ).limit(10)
+      ILIKE :search OR identifier ILIKE :search", search: "%#{search_query}%"
+    ).resolved_contacts.order_on_last_activity_at('desc').limit(10)
   end
 end