feat(platform): DM session rekey notice and contact avatarHash

Set dmSessionRekey on group participant change, expose in view,
clearDmSessionRekeyNotice API, enrich listContacts with mesh avatarHash.

index.js

@@ -347,6 +347,7 @@ class PearcordPlatform extends EventEmitter {
     this.soundboardRegistry = null
     this.guildRoles = null
     this._activeChannelOpenLastReadAt = 0
+    this._dmSessionRekeyNotice = null
     this.channelPermissions = null
     this._recentSoundPlays = []
     this.botEvents = null
@@ -1846,6 +1847,11 @@ class PearcordPlatform extends EventEmitter {
     }
   }
 
+  clearDmSessionRekeyNotice () {
+    this._dmSessionRekeyNotice = null
+    return true
+  }
+
   async addGroupDmMember ({ channelId, peerUserId }) {
     const span = this.log.time('dm.group.add-member', {
       spanKind: 'dm.group.add-member',
@@ -1862,6 +1868,14 @@ class PearcordPlatform extends EventEmitter {
         participantIds: channel.participantIds
       })
       this.emit('dm', channel)
+      if (channel.id && channelId && channel.id !== channelId) {
+        this._dmSessionRekeyNotice = {
+          channelId: channel.id,
+          previousChannelId: channelId,
+          at: Date.now(),
+          reason: 'group-participant-change'
+        }
+      }
       span.end({
         spanKind: 'dm.group.add-member',
         channelId: channel.id,
@@ -1897,6 +1911,14 @@ class PearcordPlatform extends EventEmitter {
         participantIds: channel.participantIds
       })
       this.emit('dm', channel)
+      if (channel.id && channelId && channel.id !== channelId) {
+        this._dmSessionRekeyNotice = {
+          channelId: channel.id,
+          previousChannelId: channelId,
+          at: Date.now(),
+          reason: 'group-participant-change'
+        }
+      }
       span.end({
         spanKind: 'dm.group.remove-member',
         channelId: channel.id,
@@ -2555,6 +2577,7 @@ class PearcordPlatform extends EventEmitter {
         presence: presenceMap[f.peerUserId]?.status || 'offline',
         customStatus: presenceMap[f.peerUserId]?.customStatus || null,
         activity: presenceMap[f.peerUserId]?.activity || null,
+        avatarHash: presenceMap[f.peerUserId]?.avatarHash || f.avatarHash || null,
         mutualGuildCount: await this._mutualGuildCount(f.peerUserId)
       })
     }
@@ -20009,6 +20032,7 @@ class PearcordPlatform extends EventEmitter {
         connected: false,
         peerCount: 0
       },
+      dmSessionRekey: this._dmSessionRekeyNotice,
       dmPeer: this._dmPeerId(),
       dmTitle: this.dm?.channel?.name || null,
       dmIsGroup: !!this.dm?.channel?.isGroup,