feat(platform): createForumPost API and forumPosts view snapshot

Create forum posts as threads with starter messages, gossip channel create/
update, audit forum.post.create, and expose sorted forumPosts when a forum
channel is active. Block typing on forum channels.

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

index.js

@@ -45,7 +45,13 @@ const {
   openDmContent,
   dmEncryptionAvailable
 } = require('pearcord-crypto')
-const { defaultThreadName, groupThreadsByParent, isThreadChannel } = require('pearcord-threads')
+const {
+  defaultThreadName,
+  groupThreadsByParent,
+  isThreadChannel,
+  isForumChannel,
+  sortForumPosts
+} = require('pearcord-threads')
 const {
   COLLECTIONS, USER_STATUS, PERMISSION, roleHasPermission, canModifyMessage,
   resolveMentionedUserIds, extractFirstUrl, id, now
@@ -1930,6 +1936,7 @@ class PearcordPlatform extends EventEmitter {
     if (this.mode === 'guild') {
       const channels = await this.guild.listChannels()
       const ch = channels.find((c) => c.id === this.activeChannelId)
+      if (isForumChannel(ch)) return null
       if (isThreadChannel(ch) && ch.archived) return null
     }
     const payload = {
@@ -1968,6 +1975,35 @@ class PearcordPlatform extends EventEmitter {
     return channel
   }
 
+  async createForumPost ({ title, content }) {
+    if (!this.guild?.guild || !this.activeChannelId) throw new Error('no active forum channel')
+    const forum = await this.db.get(COLLECTIONS.CHANNELS, {
+      guildId: this.guild.guild.id,
+      id: this.activeChannelId
+    })
+    if (!forum || !isForumChannel(forum)) {
+      throw new Error('select a forum channel to create a post')
+    }
+    const postTitle = String(title || '').trim() || 'Untitled post'
+    const body = String(content || '').trim()
+    if (!body) throw new Error('post content required')
+    const thread = await this.guild.createForumThread({
+      parentChannelId: forum.id,
+      name: postTitle
+    })
+    this.guild.gossipChannel(thread)
+    await this.selectChannel(thread.id)
+    const message = await this.sendMessage(body)
+    const merged = await this.guild.setThreadRootMessage(thread.id, message.id)
+    this.guild.gossipChannelUpdate(merged)
+    await this._audit('forum.post.create', {
+      guildId: this.guild.guild.id,
+      targetId: thread.id
+    })
+    this.emit('channel', merged)
+    return { thread: merged, message }
+  }
+
   async createThread ({ messageId, name }) {
     if (!this.guild?.guild || !this.activeChannelId) throw new Error('no active text channel')
     const parent = await this.db.get(COLLECTIONS.CHANNELS, {
@@ -2336,6 +2372,10 @@ class PearcordPlatform extends EventEmitter {
       threadMessageCounts[ch.id] = rows.length
     }
     const activeChannel = channels.find((c) => c.id === this.activeChannelId) || null
+    const forumPosts =
+      activeChannel && isForumChannel(activeChannel)
+        ? sortForumPosts(threadsByParent[activeChannel.id] || [])
+        : []
     const channelMeta = {}
     if (user) {
       const alertRows = await this.db.find(COLLECTIONS.MENTION_ALERTS, { userId: user.id })
@@ -2468,6 +2508,7 @@ class PearcordPlatform extends EventEmitter {
       threadsByParent,
       threadMessageCounts,
       threadTypingByParent,
+      forumPosts,
       activeChannel,
       needsGuild: this.onboarded && !this.guilds.length && this.mode !== 'dm',
       guildUnread,