[fix](trx-frontend-http): fix scheduler virtual channel selection

Apply scheduler-backed virtual channels as real manual selections so they take control, retune the rig, and restore bookmark decoder state including APRS/PKT. Also remove the inner border from the map decode locator tooltip.\n\nVerification: cargo test -p trx-frontend-http vchan\nVerification: node --check src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/vchan.js\n\nCo-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

@@ -245,6 +245,7 @@ async function vchanDelete(channelId) {
 async function vchanSubscribe(channelId) {
   if (!vchanSessionId || !vchanRigId) return;
   try {
+    await vchanTakeSchedulerControl();
     const resp = await fetch(
       `/channels/${encodeURIComponent(vchanRigId)}/${encodeURIComponent(channelId)}/subscribe`,
       {
@@ -418,6 +419,7 @@ async function vchanSetChannelFreq(freqHz) {
     }
   }
   try {
+    await vchanTakeSchedulerControl();
     const resp = await fetch(
       `/channels/${encodeURIComponent(vchanRigId)}/${encodeURIComponent(vchanActiveId)}/freq`,
       {
@@ -435,6 +437,7 @@ async function vchanSetChannelFreq(freqHz) {
 async function vchanSetChannelBandwidth(bwHz) {
   if (!vchanRigId || !vchanActiveId) return;
   try {
+    await vchanTakeSchedulerControl();
     const resp = await fetch(
       `/channels/${encodeURIComponent(vchanRigId)}/${encodeURIComponent(vchanActiveId)}/bw`,
       {
@@ -452,6 +455,7 @@ async function vchanSetChannelBandwidth(bwHz) {
 async function vchanSetChannelMode(mode) {
   if (!vchanRigId || !vchanActiveId) return;
   try {
+    await vchanTakeSchedulerControl();
     const resp = await fetch(
       `/channels/${encodeURIComponent(vchanRigId)}/${encodeURIComponent(vchanActiveId)}/mode`,
       {