fix(content): audio always plays in the bottom-bar player + ecash purchase is explicit two-step

- Owned/purchased and cloud audio never opens a lightbox: PeerFiles'
  owned-content viewer and the Cloud/CloudFolder preview route audio to the
  global bottom-bar player (video keeps the lightbox).
- Web5 shared-content 'Buy' no longer fires the node-ecash payment on
  click: it opens a confirmation with balance -> price -> balance-after,
  and pays only on explicit confirm.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/src/views/PeerFiles.vue

@@ -674,6 +674,13 @@ async function viewOwned(item: CatalogItem) {
     })
     if (!res?.data) { purchaseError.value = res?.error || 'Could not open your purchased file'; return }
     const mime = res.mime_type || item.mime_type
+    // Audio always plays in the global bottom-bar player — never the lightbox
+    // (the blob URL is intentionally not revoked while the bar plays it).
+    if (mime.startsWith('audio/')) {
+      const url = URL.createObjectURL(base64ToBlob(res.data, mime))
+      audioPlayer.play(url, item.filename.split('/').pop() || item.filename)
+      return
+    }
     if (viewerUrl.value) URL.revokeObjectURL(viewerUrl.value)
     viewerUrl.value = URL.createObjectURL(base64ToBlob(res.data, mime))
     viewerMime.value = mime