Remove dead/stale code, dedup close+escalation paths

Dead/stale removals (grep-confirmed no consumers):
- config: drop 9 unread CONFIG keys (ROLE_TO_PING_ID, SIGNATURE,
  REMINDER_*, RENAME_LOG_CHANNEL_ID, SETTINGS_*); remove their
  ALLOWED_CONFIG_KEYS entries and the orphaned settings-site UI fields
- configSchema: delete unreachable json/string_or_json validators
- models: drop unused ticketTag field
- gmail-poll: remove unused isPollSuspended export
- utils: remove dead htmlToTextWithBlocks/decodeHtmlEntities/BLOCK_TAG_REGEX
- internalApi: remove router._allowedKeys (test it served is gone)
- discord client: drop unused GuildPresences privileged intent
- broccolini-discord: remove dormant /api 503 gate (no /api routes)

Fixes:
- context-menu ticket create now uses makeTicketName('unclaimed', ...)
  instead of the contract-violating ticket-<n> name
- drop write-only pending.userId from both close paths

Dedup / simplify:
- new services/transcript.js shares the transcript text/date/header
  builders between the button and force-close paths (had drifted)
- resolveEscalationCategoryId() replaces 3 copies of the category logic
- ticketChannelOverwrites() shares the create-permission array between
  the two interactive ticket-create paths
- finalizeBody() shares the email-cleanup tail in parseGmailMessage
- getTicketActionRow drops its never-passed options arg;
  sendTicketNotificationEmail drops its always-null subjectLine arg
- hoist invariant guild lookup out of the auto-close/unclaim loops
- drop redundant lastActivity write (and now-dead updateTicketActivity)
- /help lists all current commands and the right-click apps

handlers/commands/close.js

@@ -14,6 +14,7 @@ const { enqueueSend } = require('../../services/channelQueue');
 const { logTicketEvent } = require('../../services/debugLog');
 const { pendingCloses } = require('../pendingCloses');
 const { findTicketForChannel } = require('../sharedHelpers');
+const { buildTranscriptText, formatDateForTranscript, renderTranscriptHeader } = require('../../services/transcript');
 
 const Ticket = mongoose.model('Ticket');
 
@@ -56,7 +57,7 @@ async function handleForceClose(interaction) {
   const channelRef = interaction.channel;
   const clientRef = interaction.client;
   const timerId = setTimeout(() => finalizeForceClose(channelRef, clientRef), timerSeconds * 1000);
-  pendingCloses.set(channelRef.id, { timeout: timerId, userId: interaction.user.id, username: interaction.user.tag });
+  pendingCloses.set(channelRef.id, { timeout: timerId, username: interaction.user.tag });
 }
 
 /** Performs the actual force-close work after the countdown elapses. */
@@ -92,14 +93,7 @@ async function finalizeForceClose(channelRef, clientRef) {
 async function postTranscript(channelRef, clientRef, freshTicket) {
   await enqueueSend(channelRef, CONFIG.DISCORD_CLOSE_MESSAGE);
 
-  const messages = await channelRef.messages.fetch({ limit: 100 });
-  const log =
-    `TRANSCRIPT: ${freshTicket.subject}\nUser: ${freshTicket.senderEmail}\n---\n` +
-    messages
-      .reverse()
-      .map(m => `[${m.createdAt.toLocaleString()}] ${m.author.tag}: ${m.cleanContent}`)
-      .join('\n');
-
+  const log = await buildTranscriptText(channelRef, freshTicket);
   const file = new AttachmentBuilder(Buffer.from(log), {
     name: `transcript-${channelRef.name}.txt`
   });
@@ -109,19 +103,9 @@ async function postTranscript(channelRef, clientRef, freshTicket) {
     .catch(() => null);
   if (!transcriptChan) return;
 
-  const fmt = (d) => new Date(d).toLocaleString('en-US', {
-    month: '2-digit', day: '2-digit', year: 'numeric',
-    hour: '2-digit', minute: '2-digit', second: '2-digit',
-    hour12: true, timeZoneName: 'short'
-  });
-  const openedStr = fmt(freshTicket.createdAt);
-  const closedStr = fmt(new Date());
-  const transcriptContent = CONFIG.DISCORD_TRANSCRIPT_MESSAGE
-    .replace(/\{channel_name\}/g, channelRef.name)
-    .replace(/\{email\}/g, freshTicket.senderEmail || '')
-    .replace(/\{date_opened\}/g, openedStr)
-    .replace(/\{date_closed\}/g, closedStr)
-    + `\n\nDate Opened: ${openedStr}\nDate Closed: ${closedStr}`;
+  const openedStr = formatDateForTranscript(freshTicket.createdAt);
+  const closedStr = formatDateForTranscript(new Date());
+  const transcriptContent = renderTranscriptHeader(channelRef.name, freshTicket.senderEmail, openedStr, closedStr);
   await enqueueSend(transcriptChan, { content: transcriptContent, files: [file] });
 }