[fix](trx-frontend-http): show scheduler interleave timing

Replace the misleading scheduler task countdown with the actual time-span interleave switch timing in the main controls row.

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

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

@@ -13,18 +13,6 @@ let vchanChannels = [];
 let vchanActiveId = null;
 let schedulerReleaseState = null;
 let schedulerReleasePollTimer = null;
-let schedulerCycleCountdownTimer = null;
-
-function schedulerNextCycleSeconds() {
-  const periodMs = 30000;
-  const remMs = periodMs - (Date.now() % periodMs);
-  const secs = Math.ceil(remMs / 1000);
-  return Math.max(1, Math.min(30, secs));
-}
-
-function schedulerCycleSummaryText() {
-  return `Next scheduler cycle in ${schedulerNextCycleSeconds()}s.`;
-}
 
 function vchanFmtFreq(hz) {
   if (!Number.isFinite(hz) || hz <= 0) return "--";
@@ -59,14 +47,12 @@ function schedulerReleaseSummaryText(state) {
 function vchanRenderSchedulerRelease() {
   const btn = document.getElementById("scheduler-release-btn");
   const status = document.getElementById("scheduler-release-status");
-  const cycleStatus = document.getElementById("scheduler-cycle-status");
   if (!btn || !status) return;
   const currentReleased = !!(schedulerReleaseState && schedulerReleaseState.current_session_released);
   btn.disabled = !vchanSessionId || currentReleased;
   btn.classList.toggle("active", !currentReleased);
   btn.textContent = "Release to Scheduler";
   status.textContent = schedulerReleaseSummaryText(schedulerReleaseState);
-  if (cycleStatus) cycleStatus.textContent = schedulerCycleSummaryText();
 }
 
 async function vchanPollSchedulerRelease() {
@@ -90,10 +76,6 @@ function vchanStartSchedulerReleasePolling() {
     clearInterval(schedulerReleasePollTimer);
   }
   schedulerReleasePollTimer = setInterval(vchanPollSchedulerRelease, 10000);
-  if (schedulerCycleCountdownTimer) {
-    clearInterval(schedulerCycleCountdownTimer);
-  }
-  schedulerCycleCountdownTimer = setInterval(vchanRenderSchedulerRelease, 1000);
 }
 
 async function vchanToggleSchedulerRelease() {