Stop V4V streaming when audio playback fails

When audio hits the 15s loading timeout or fires an error event,
stop any active V4V streaming to prevent phantom sat payments
on episodes that aren't actually playing.

src/components/podcast/PodcastPlayerBar.tsx

@@ -2,6 +2,7 @@ import { useRef, useEffect, useCallback, useState } from "react";
 import type { PodcastEpisode } from "../../types/podcast";
 import { usePodcastStore } from "../../stores/podcast";
 import { publishNote } from "../../lib/nostr";
+import { stopStreaming } from "../../lib/podcast/v4v";
 import { V4VIndicator } from "./V4VIndicator";
 
 function formatTime(seconds: number): string {
@@ -104,12 +105,18 @@ export function PodcastPlayerBar() {
     };
     audio.addEventListener("canplaythrough", onCanPlay);
 
-    // Timeout: if audio doesn't load within 15s, show helpful error
+    // Timeout: if audio doesn't load within 15s, show helpful error and stop V4V
     const timeout = setTimeout(() => {
       if (!loaded) {
         audio.removeEventListener("canplaythrough", onCanPlay);
         setAudioError("Audio file not available — the podcast host may be down or the episode URL is broken.");
         setPlaybackState("paused");
+        // Stop V4V streaming if it auto-started before the audio failed
+        if (usePodcastStore.getState().v4vStreaming) {
+          stopStreaming();
+          usePodcastStore.getState().setV4VStreaming(false);
+          usePodcastStore.getState().setV4VEnabled(false);
+        }
       }
     }, 15000);
 
@@ -246,6 +253,11 @@ export function PodcastPlayerBar() {
           const msg = audioRef.current?.error?.message;
           setAudioError(`Audio error ${code}: ${msg || "failed to load"}`);
           setPlaybackState("paused");
+          if (usePodcastStore.getState().v4vStreaming) {
+            stopStreaming();
+            usePodcastStore.getState().setV4VStreaming(false);
+            usePodcastStore.getState().setV4VEnabled(false);
+          }
         }}
       />
       {!episode ? null : (