fix(core): clamp audio volume to [0,1] range

packages/core/src/runtime/init.ts

@@ -1586,7 +1586,7 @@ export function initSandboxRuntimeModular(): void {
         if (!(el instanceof HTMLMediaElement)) continue;
         const parsed = parseFloat(el.dataset.volume ?? "");
         const clipVolume = Number.isFinite(parsed) ? parsed : 1;
-        el.volume = clipVolume * volume;
+        el.volume = Math.max(0, Math.min(1, clipVolume * volume));
       }
     },
     onSetMediaOutputMuted: (muted) => {

packages/core/src/runtime/media.ts

@@ -152,7 +152,7 @@ export function syncRuntimeMedia(params: {
         }
       }
       const userVol = params.userVolume ?? 1;
-      el.volume = (clip.volume ?? 1) * userVol;
+      el.volume = Math.max(0, Math.min(1, (clip.volume ?? 1) * userVol));
       if (shouldMute) el.muted = true;
       // Ensure full preload for every active media element. Streaming
       // formats (MP3) may arrive with preload="metadata", which only

packages/player/src/parent-media.ts

@@ -109,7 +109,7 @@ export class ParentMediaManager {
   }
 
   updateVolume(volume: number): void {
-    for (const m of this._entries) m.el.volume = volume;
+    for (const m of this._entries) m.el.volume = Math.max(0, Math.min(1, volume));
   }
 
   updatePlaybackRate(rate: number): void {
@@ -249,7 +249,7 @@ export class ParentMediaManager {
     el.src = src;
     el.load();
     el.muted = this._getMuted();
-    el.volume = this._getVolume();
+    el.volume = Math.max(0, Math.min(1, this._getVolume()));
     const rate = this._getPlaybackRate();
     if (rate !== 1) el.playbackRate = rate;