fix: use data-tooltip CSS popup for hide-upgrade-failures checkbox, matching episode tooltip style

public/index.html

@@ -98,7 +98,7 @@
                                 <input type="number" id="history-days" class="history-days-input" value="7" min="1" max="90">
                                 <span class="history-days-label">days</span>
                                 <button id="history-refresh-btn" class="history-refresh-btn" title="Refresh history">&#8635;</button>
-                                <label class="history-toggle-label" id="ignore-available-label" title="Hide failed downloads where the item is already available on disk (i.e. a failed upgrade attempt)">
+                                <label class="history-toggle-label" id="ignore-available-label" data-tooltip="Hide failed downloads where the item is already available on disk (i.e. a failed upgrade attempt)">
                                     <input type="checkbox" id="ignore-available-toggle">
                                     <span>Hide upgrade failures</span>
                                 </label>