Preserve emit loop delay schedule across range cleanup

client/public/version.js

@@ -1,5 +1,5 @@
 // Maintainer-controlled web client version.
 // Format: YYYY.MM.DD Rn (example: 2026.02.20 R2)
-window.CHGRID_WEB_VERSION = "2026.02.28 R306";
+window.CHGRID_WEB_VERSION = "2026.02.28 R307";
 // Optional display timezone for timestamps. Falls back to America/Detroit if unset/invalid.
 window.CHGRID_TIME_ZONE = "America/Detroit";

client/src/audio/itemEmitRuntime.ts

@@ -87,9 +87,10 @@ export class ItemEmitRuntime {
     private readonly getSpatialConfig: (item: WorldItem) => EmitSpatialConfig,
   ) {}
 
-  cleanup(itemId: string): void {
+  cleanup(itemId: string, options?: { preserveSchedule?: boolean }): void {
+    const preserveSchedule = options?.preserveSchedule === true;
     const output = this.outputs.get(itemId);
-    if (!output) return;
+    if (output) {
       output.element.pause();
       output.element.removeEventListener('ended', output.onEnded);
       output.element.src = '';
@@ -99,8 +100,11 @@ export class ItemEmitRuntime {
       output.gain.disconnect();
       output.panner?.disconnect();
       this.outputs.delete(itemId);
+    }
     this.pendingEmitStarts.delete(itemId);
+    if (!preserveSchedule) {
       this.nextEmitStartAtMs.delete(itemId);
+    }
     this.emitStartFailureCount.delete(itemId);
   }
 
@@ -139,16 +143,22 @@ export class ItemEmitRuntime {
     }
     const listeners = this.listenerPositions;
     const validIds = new Set<string>();
+    const seenItemIds = new Set<string>();
     let audioCtx = this.audio.context;
 
     for (const item of items) {
+      seenItemIds.add(item.id);
       const emitSound = String(item.params.emitSound ?? item.emitSound ?? '').trim();
       const enabled = item.params.enabled !== false;
       const soundUrl = enabled ? this.resolveSoundUrl(emitSound) : '';
-      if (!soundUrl || !this.shouldKeepRuntime(item, listeners, this.outputs.has(item.id))) {
+      if (!soundUrl) {
         this.cleanup(item.id);
         continue;
       }
+      if (!this.shouldKeepRuntime(item, listeners, this.outputs.has(item.id))) {
+        this.cleanup(item.id, { preserveSchedule: true });
+        continue;
+      }
       validIds.add(item.id);
       const existing = this.outputs.get(item.id);
       if (existing && existing.soundUrl === soundUrl) {
@@ -214,6 +224,12 @@ export class ItemEmitRuntime {
         this.cleanup(itemId);
       }
     }
+
+    for (const itemId of Array.from(this.nextEmitStartAtMs.keys())) {
+      if (!seenItemIds.has(itemId)) {
+        this.nextEmitStartAtMs.delete(itemId);
+      }
+    }
   }
 
   updateSpatialAudio(items: Map<string, WorldItem>, playerPosition: { x: number; y: number }): void {