[fix](trx-frontend-http): populate scheduler rig list after SSE delivers rig data

initScheduler() runs before the first SSE event, so lastRigIds is empty.
Now applyRigList() calls reloadSchedulerRigSelect() whenever the rig list
updates, and renderSchedulerRigSelect() loads the config for the first rig
if currentRigId was previously unset.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js

@@ -745,6 +745,7 @@ function applyRigList(activeRigId, rigIds, displayNames) {
   const disableSwitch = lastRigIds.length === 0 || !authRole || authRole === "rx";
   populateRigPicker(headerRigSwitchSelect, lastRigIds, activeRigId, disableSwitch);
   updateRigSubtitle(activeRigId);
+  if (typeof reloadSchedulerRigSelect === "function") reloadSchedulerRigSelect();
 }
 
 async function refreshRigList() {