[fix](trx-frontend-http): route feature bundles through the host contract

The bookmark fix addressed one instance of a defect the TypeScript
migration left across the feature entries.  app.js stopped being a
classic script, so its top-level declarations are no longer shared
globals, but the converted entries kept reading them as window
properties that nothing publishes.

Restore the broken behavior:

- ais, aprs, hf-aprs read serverLat, serverLon and haversineKm as
  undefined, so every positioned packet rendered an empty distance.
- ais, aprs, hf-aprs, cw, sat, vdes, wefax, wspr called an undefined
  postPath, so clear-history and decoder toggles threw.
- scheduler read authRole as undefined, so the lazy-load path never
  self-initialized and the Settings tab opened an inert scheduler.
- background-decode read authEnabled as undefined, so control gating
  fell back to role-only.
- vchan read fifteen application values and services as undefined:
  mode and bandwidth sync, the out-of-band hint, RX audio restart, and
  the frequency field all silently no-opped on a virtual channel.
- vchan wrapped window.refreshFreqDisplay, capturing an undefined
  original exactly as it did for setRigFrequency, so leaving a channel
  never restored the application's own frequency display.
- _audioChannelOverride was a const that nothing could assign, so RX
  audio always subscribed to the primary channel.
- ftx-family read fmtTime, a helper legacy ft8.js owned locally, so
  decode bar timestamps rendered empty.

Declare the contract once in plugins/host.ts and import it from the
feature entries, rather than restoring globals that
docs/frontend-architecture.md excludes.  trx.state gains jogUnit,
rxActive and audioChannelOverride, and makes lastModeName writable;
trx.core gains the tuning, RDS, WFM, jog and RX audio services the
entries need.  vchan interception moves to an interceptFreqDisplay
service method that refreshFreqDisplay calls, matching the frequency,
mode and bandwidth interception it already registers.

Reading registry-built elements through a strict lookup is the same
defect as in bookmarks: renderTimelineNeedle guards its result, but
schedulerEl throws, so the now-initializing scheduler crashed on the
timeline needle group that its own SVG creates.

Feature tests move onto a shared host fixture, and entries that now
import a common module are bundled through bundleEntry like the other
shared-module entries.  Covers scheduler self-initialization and the
distance path that the bare window reads broke.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GdyUjuXejCEfiub675z6cz
Signed-off-by: Stan Grams <sjg@haxx.space>

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

@@ -1,3 +1,8 @@
+import {
+  hostCore,
+  hostState
+} from "./chunk-KL66PICH.js";
+
 // src/plugins/vchan.ts
 var vchanWindow = window;
 var vchanSessionId = null;
@@ -63,7 +68,7 @@ function vchanStartSchedulerReleasePolling() {
 }
 async function vchanToggleSchedulerRelease() {
   if (!vchanSessionId) return;
-  const rigId = vchanRigId || vchanWindow.lastActiveRigId || null;
+  const rigId = vchanRigId || hostState.lastActiveRigId || null;
   try {
     const resp = await fetch("/scheduler-control", {
       method: "PUT",
@@ -161,14 +166,12 @@ function vchanRender() {
   });
   picker.appendChild(addBtn);
   vchanSyncAccentUI();
-  if (vchanWindow.updateDocumentTitle && vchanWindow.activeChannelRds) {
-    vchanWindow.updateDocumentTitle(vchanWindow.activeChannelRds());
-  }
+  hostCore.updateDocumentTitle(hostCore.activeChannelRds());
   vchanRenderSchedulerRelease();
 }
 async function vchanAllocate() {
   if (!vchanSessionId || !vchanRigId) return;
-  const freqHz = typeof vchanWindow.lastFreqHz === "number" && vchanWindow.lastFreqHz > 0 ? vchanWindow.lastFreqHz : 0;
+  const freqHz = typeof hostState.lastFreqHz === "number" && hostState.lastFreqHz > 0 ? hostState.lastFreqHz : 0;
   const modeEl = document.getElementById("mode");
   const mode = modeEl ? modeEl.value || "USB" : "USB";
   try {
@@ -251,11 +254,11 @@ async function vchanSubscribe(channelId) {
 }
 function vchanReconnectAudio() {
   const ch = vchanIsOnVirtual() ? vchanActiveChannel() : null;
-  vchanWindow._audioChannelOverride = ch?.id ?? null;
-  if (!vchanWindow.rxActive) return;
-  vchanWindow.stopRxAudio?.();
+  hostState.audioChannelOverride = ch?.id ?? null;
+  if (!hostState.rxActive) return;
+  hostCore.stopRxAudio();
   setTimeout(() => {
-    vchanWindow.startRxAudio?.();
+    hostCore.startRxAudio();
   }, 300);
 }
 function vchanApplyCapabilities(caps) {
@@ -276,11 +279,7 @@ function vchanUpdateFreqDisplay() {
   if (!ch) return;
   const el = document.getElementById("freq");
   if (!el) return;
-  if (vchanWindow.formatFreqForStep && typeof vchanWindow.jogUnit === "number") {
-    el.value = vchanWindow.formatFreqForStep(ch.freq_hz, vchanWindow.jogUnit);
-  } else {
-    el.value = (ch.freq_hz / 1e6).toFixed(6).replace(/\.?0+$/, "");
-  }
+  el.value = hostCore.formatFreqForStep(ch.freq_hz, hostState.jogUnit);
 }
 function vchanSyncModeDisplay() {
   const modeEl = document.getElementById("mode");
@@ -290,21 +289,21 @@ function vchanSyncModeDisplay() {
     if (ch && ch.mode) modeEl.value = ch.mode.toUpperCase();
   }
   const modeUpper = (modeEl.value || "").toUpperCase();
-  if (typeof vchanWindow.lastModeName === "string") {
-    if (modeUpper === "WFM" && vchanWindow.lastModeName !== "WFM") {
-      vchanWindow.setJogDivisor?.(10);
-      vchanWindow.resetRdsDisplay?.();
-    } else if (modeUpper !== "WFM" && vchanWindow.lastModeName === "WFM") {
-      vchanWindow.resetRdsDisplay?.();
+  if (typeof hostState.lastModeName === "string") {
+    if (modeUpper === "WFM" && hostState.lastModeName !== "WFM") {
+      hostCore.setJogDivisor(10);
+      hostCore.resetRdsDisplay();
+    } else if (modeUpper !== "WFM" && hostState.lastModeName === "WFM") {
+      hostCore.resetRdsDisplay();
     }
-    vchanWindow.lastModeName = modeUpper;
+    hostState.lastModeName = modeUpper;
   }
-  vchanWindow.updateWfmControls?.();
-  vchanWindow.updateSdrSquelchControlVisibility?.();
+  hostCore.updateWfmControls();
+  hostCore.updateSdrSquelchControlVisibility();
   if (vchanWindow.refreshRdsUi) {
     vchanWindow.refreshRdsUi();
   } else {
-    vchanWindow.positionRdsPsOverlay?.();
+    hostCore.positionRdsPsOverlay();
   }
 }
 function vchanSyncBwDisplay() {
@@ -314,12 +313,12 @@ function vchanSyncBwDisplay() {
   const bwEl = document.getElementById("spectrum-bw-input");
   if (!bwEl) return;
   let bwHz = ch.bandwidth_hz || 0;
-  if (bwHz === 0 && vchanWindow.mwDefaultsForMode) {
-    bwHz = vchanWindow.mwDefaultsForMode(ch.mode)[0] || 0;
+  if (bwHz === 0) {
+    bwHz = hostCore.mwDefaultsForMode(ch.mode)[0] || 0;
   }
   if (bwHz > 0) {
     bwEl.value = (bwHz / 1e3).toFixed(3).replace(/\.?0+$/, "");
-    vchanWindow.currentBandwidthHz = bwHz;
+    hostState.currentBandwidthHz = bwHz;
   }
 }
 function vchanSyncAccentUI() {
@@ -333,25 +332,20 @@ function vchanSyncAccentUI() {
     vchanSyncModeDisplay();
     vchanSyncBwDisplay();
   } else {
-    origRefreshFreqDisplay?.();
-  }
-  if (vchanWindow.updateDocumentTitle && vchanWindow.activeChannelRds) {
-    vchanWindow.updateDocumentTitle(vchanWindow.activeChannelRds());
+    hostCore.refreshFreqDisplay();
   }
+  hostCore.updateDocumentTitle(hostCore.activeChannelRds());
 }
-var origRefreshFreqDisplay = null;
 function vchanSetChannelFreq(freqHz) {
   if (!vchanRigId || !vchanActiveId) return;
-  if (vchanWindow.lastSpectrumData && vchanWindow.lastSpectrumData.sample_rate > 0) {
-    const halfSpan = vchanWindow.lastSpectrumData.sample_rate / 2;
-    const center = vchanWindow.lastSpectrumData.center_hz;
+  if (hostState.lastSpectrumData && hostState.lastSpectrumData.sample_rate > 0) {
+    const halfSpan = hostState.lastSpectrumData.sample_rate / 2;
+    const center = hostState.lastSpectrumData.center_hz;
     if (Math.abs(freqHz - center) > halfSpan) {
-      if (vchanWindow.showHint) {
-        vchanWindow.showHint(
-          `Out of SDR bandwidth (center ${(center / 1e6).toFixed(3)} MHz ±${(halfSpan / 1e3).toFixed(0)} kHz)`,
-          3e3
-        );
-      }
+      hostCore.showHint(
+        `Out of SDR bandwidth (center ${(center / 1e6).toFixed(3)} MHz ±${(halfSpan / 1e3).toFixed(0)} kHz)`,
+        3e3
+      );
       return;
     }
   }
@@ -413,13 +407,17 @@ async function vchanInterceptBandwidth(bwHz) {
 }
 function vchanInterceptFrequency(freqHz) {
   if (!vchanIsOnVirtual()) return false;
-  const core = vchanWindow.trx?.core;
   const targetHz = Math.round(freqHz);
-  core?.armOptimisticFrequency(targetHz);
-  core?.applyLocalTunedFrequency(targetHz);
+  hostCore.armOptimisticFrequency(targetHz);
+  hostCore.applyLocalTunedFrequency(targetHz);
   vchanSetChannelFreq(freqHz);
   return true;
 }
+function vchanInterceptFreqDisplay() {
+  if (!vchanIsOnVirtual()) return false;
+  vchanUpdateFreqDisplay();
+  return true;
+}
 vchanWindow.trx ??= {};
 vchanWindow.trx.modules ??= {};
 vchanWindow.trx.modules.vchan = {
@@ -437,6 +435,7 @@ vchanWindow.trx.modules.vchan = {
   interceptMode: vchanInterceptMode,
   interceptBandwidth: vchanInterceptBandwidth,
   interceptFrequency: vchanInterceptFrequency,
+  interceptFreqDisplay: vchanInterceptFreqDisplay,
   takeSchedulerControl: vchanTakeSchedulerControl,
   releaseToScheduler: vchanToggleSchedulerRelease
 };
@@ -450,13 +449,3 @@ vchanWindow.trx.modules.vchan = {
   vchanStartSchedulerReleasePolling();
   vchanRenderSchedulerRelease();
 })();
-(function() {
-  origRefreshFreqDisplay = vchanWindow.refreshFreqDisplay ?? null;
-  vchanWindow.refreshFreqDisplay = function() {
-    if (vchanIsOnVirtual()) {
-      vchanUpdateFreqDisplay();
-      return;
-    }
-    origRefreshFreqDisplay?.();
-  };
-})();