Add download client ordering and filtering to active downloads list

public/index.html

@@ -144,6 +144,14 @@
 
                 <div class="tab-panel" id="tab-downloads">
                     <div class="downloads-container">
+                        <div class="downloads-header">
+                            <div class="downloads-controls">
+                                <label class="download-client-label" for="download-client-filter">Download client:</label>
+                                <select id="download-client-filter" class="download-client-select">
+                                    <option value="all">All clients</option>
+                                </select>
+                            </div>
+                        </div>
                         <div id="no-downloads" class="no-downloads" style="display: none;">
                             <p>No downloads found for your user.</p>
                             <p>Make sure your shows and movies are tagged with your username in Sonarr/Radarr.</p>