fix(table): right-align the column-picker header cell

The gear hugged the left edge of the (width:100%) actions column because the
header th, unlike the body cells, has no col-actions class / text-align:right.
Set textAlign right on the actions header cell so the picker sits in the
top-right corner.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

js/app.js

@@ -3241,8 +3241,13 @@ function renderTable(list) {
             th.appendChild(el('span', null, col.label));
         }
         // Column picker lives in the table's own header corner (it only makes
-        // sense in table view), not the global toolbar.
-        if (col.key === 'actions') th.appendChild(buildColsPicker());
+        // sense in table view), not the global toolbar. The actions column is
+        // width:100% in the body, so right-align the header cell too — else the
+        // gear hugs the left edge of that wide column instead of the corner.
+        if (col.key === 'actions') {
+            th.style.textAlign = 'right';
+            th.appendChild(buildColsPicker());
+        }
         headerRow.appendChild(th);
     });
     thead.appendChild(headerRow);