[fix](trx-frontend-http): add missing WEFAX toggle button click handler

The wefax.js plugin defined wefaxToggleBtn but never attached a click
event listener, so clicking "Enable WEFAX" did nothing. Also switched
the clear button from raw fetch() to postPath() so it includes the
remote parameter in multi-rig setups.

https://claude.ai/code/session_01UJQpbecEBbphMZkSDKCiY6
Signed-off-by: Claude <noreply@anthropic.com>

src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/wefax.js

@@ -185,9 +185,25 @@ window.resetWefaxHistoryView = function () {
 };
 
 // --- Button handlers ---
+if (wefaxToggleBtn) {
+  wefaxToggleBtn.addEventListener('click', async function () {
+    try {
+      if (window.takeSchedulerControlForDecoderDisable) {
+        await window.takeSchedulerControlForDecoderDisable(wefaxToggleBtn);
+      }
+      await postPath('/toggle_wefax_decode');
+    } catch (e) {
+      console.error('WEFAX toggle failed', e);
+    }
+  });
+}
 if (wefaxClearBtn) {
-  wefaxClearBtn.addEventListener('click', function () {
-    fetch('/clear_wefax_decode', { method: 'POST' });
+  wefaxClearBtn.addEventListener('click', async function () {
+    try {
+      await postPath('/clear_wefax_decode');
       window.resetWefaxHistoryView();
+    } catch (e) {
+      console.error('WEFAX clear failed', e);
+    }
   });
 }