feat(platform): voice spans activeChannelId metadata (v0.8.521)

Extend voice.join, voice.leave, and voice.mute span ends for Phase 558 observability.

Co-authored-by: Cursor <[email protected]>

README.md

@@ -183,6 +183,8 @@ Expose a single `EventEmitter` API the UI drives over IPC (`apps/pearcord/index.
 
 **v0.8.499 (Phase 536):** Compliance/audit spans extend — `audit.append`/`audit.export`/`compliance.snapshot` end metadata (`spanKind`, `activeChannelId`). UI compliance panel compositor wrappers, audit row `lastAuditRowId` + roving `tabindex`, clipboard compliance busy flags. Bundle: `npm run test:phase536-compliance`. See [COMPLIANCE.md](../../docs/COMPLIANCE.md), [AUDIT_LOG.md](../../docs/AUDIT_LOG.md).
 
+**v0.8.521 (Phase 558):** Voice spans extend — `voice.join`/`voice.leave`/`voice.mute` `activeChannelId`. UI `#voice-panel-live`, `syncVoiceOccupancyLivePanelDuringGuildLoading`. Bundle: `npm run test:phase558-voice`. See [VOICE.md](../../docs/VOICE.md).
+
 **v0.8.520 (Phase 557):** Embed spans extend — `embed.resolve`/`embed.gossip` `messageId`/`activeChannelId`; `embed.clear` on delete via `clearForMessageContent`. UI split embed panels; `#embed-panel-live`. Bundle: `npm run test:phase557-embeds`. See [EMBEDS.md](../../docs/EMBEDS.md).
 
 **v0.8.519 (Phase 556):** Attachment spans extend — `attachment.stage` `stagedCount`/`remainingStagingCapacity`; `attachment.read` `activeChannelId`; `attachment.unlink` on delete. UI split attachment panels; `#attachment-panel-live`. Bundle: `npm run test:phase556-attachments`. See [ATTACHMENTS.md](../../docs/ATTACHMENTS.md).

index.js

@@ -7718,6 +7718,7 @@ class PearcordPlatform extends EventEmitter {
         listenOnly,
         listenOnlyRequested: !!opts.listenOnly,
         guildId,
+        activeChannelId: this.activeChannelId,
         channelType: 'voice',
         peerCount,
         wasInVoice: !!prevChannelId,
@@ -7764,6 +7765,7 @@ class PearcordPlatform extends EventEmitter {
         spanKind: 'voice.mute',
         channelId,
         guildId,
+        activeChannelId: this.activeChannelId,
         muted: !!muted,
         deafened: deafened === undefined ? !!this.voiceMedia.deafened : !!deafened,
         listenOnly: !!this.voiceMedia.listenOnly,
@@ -7832,6 +7834,7 @@ class PearcordPlatform extends EventEmitter {
         left: !!payload,
         channelId: payload?.channelId || null,
         guildId,
+        activeChannelId: this.activeChannelId,
         leavingIsStage,
         hadMedia,
         listenOnlyWas,