core&ui: enhanced category selector

packages/ui-default/templates/partials/category.html

@@ -2,13 +2,13 @@
   {%- for category, sub_categories in model.system.get('problem.categories')|parseYaml -%}
     <li class="group-list__item">
       <h2 class="section__title">
-        <a href="{{ url('problem_category', category=category) }}" data-category="{{ category }}">{{ category }}</a>
+        <a href="{{ url('problem_main', query={q:'category:'+category}) }}" data-category="{{ category }}">{{ category }}</a>
       </h2>
       {% if sub_categories | length > 0 %}
         <ol class="chip-list">
           {%- for sub_category in sub_categories -%}
             <li class="chip-list__item">
-              <a class="typo-a" href="{{ url('problem_category', category=(category + ',' + sub_category)) }}">{{ sub_category }}</a>
+              <a class="typo-a" href="{{ url('problem_main', query={q:'category:'+sub_category}) }}">{{ sub_category }}</a>
             </li>
           {%- endfor -%}
         </ol>