(de-) select all

frontend/app.js

@@ -636,12 +636,20 @@ function renderFilters(container, session) {
         const wrapper = document.createElement('div');
         wrapper.className = 'setting-item';
 
+        const labelRow = document.createElement('div');
+        labelRow.className = 'setting-label-row';
+
         const label = document.createElement('label');
         label.textContent = optionGroup.title || optionGroup.id;
+        labelRow.appendChild(label);
         const options = optionGroup.options || [];
         const currentSelection = session.options ? session.options[optionGroup.id] : null;
 
         if (optionGroup.multiSelect) {
+            const actionBtn = document.createElement('button');
+            actionBtn.type = 'button';
+            actionBtn.className = 'btn-link';
+
             const list = document.createElement('div');
             list.className = 'multi-select';
 
@@ -651,6 +659,14 @@ function renderFilters(container, session) {
                     : []
             );
 
+            const updateActionLabel = () => {
+                const allChecked = options.length > 0 &&
+                    Array.from(list.querySelectorAll('input[type="checkbox"]'))
+                        .every((cb) => cb.checked);
+                actionBtn.textContent = allChecked ? 'Deselect all' : 'Select all';
+                actionBtn.disabled = options.length === 0;
+            };
+
             options.forEach((opt) => {
                 const item = document.createElement('label');
                 item.className = 'multi-select-item';
@@ -677,6 +693,7 @@ function renderFilters(container, session) {
                     setSession(nextSession);
                     savePreference(nextSession);
                     resetAndReload();
+                    updateActionLabel();
                 };
 
                 item.appendChild(checkbox);
@@ -684,7 +701,30 @@ function renderFilters(container, session) {
                 list.appendChild(item);
             });
 
-            wrapper.appendChild(label);
+            updateActionLabel();
+
+            actionBtn.onclick = () => {
+                const checkboxes = Array.from(list.querySelectorAll('input[type="checkbox"]'));
+                const allChecked = checkboxes.length > 0 && checkboxes.every((cb) => cb.checked);
+                checkboxes.forEach((cb) => {
+                    cb.checked = !allChecked;
+                });
+
+                const nextSession = getSession();
+                if (!nextSession || !nextSession.channel) return;
+                const selected = [];
+                if (!allChecked) {
+                    options.forEach((opt) => selected.push(opt));
+                }
+                nextSession.options[optionGroup.id] = selected;
+                setSession(nextSession);
+                savePreference(nextSession);
+                resetAndReload();
+                updateActionLabel();
+            };
+
+            labelRow.appendChild(actionBtn);
+            wrapper.appendChild(labelRow);
             wrapper.appendChild(list);
             container.appendChild(wrapper);
             return;
@@ -715,7 +755,7 @@ function renderFilters(container, session) {
             resetAndReload();
         };
 
-        wrapper.appendChild(label);
+        wrapper.appendChild(labelRow);
         wrapper.appendChild(select);
         container.appendChild(wrapper);
     });