Send Message 1.0.0: one PIN, one place to send from; Slack 1.3.0 and ProdCom 1.4.0 become messaging providers

A new send-message module owns everything a dashboard sends: the PIN
(switchable off in admin), the unlock tokens, the Send message and Quick
replies tiles, the quick replies and quick emojis. It opens no upstream
connection of its own — it finds every module declaring
provides: ["messaging"] through the shell's module list and hands each
message to that module's POST /messaging/send over loopback, so Slack keeps
its one Slack connection and ProdCom its one ProdCom connection. Providers
check the browser's unlock token with GET /verify over loopback before
touching their upstream, so no browser on the network can post as the
location without having entered the PIN here.

Slack 1.3.0 is view-only plus reactions: the Sending group, PIN, send tiles
and quick replies are gone; it serves the messaging descriptor (channels as
recipients) and its reactions ride on the Send Message unlock. A layout's
old Send message / Quick replies tiles draw nothing until removed.

ProdCom 1.4.0 serves the descriptor as identities — only channels with
typingEnabled, since typed text goes out *as* a channel — and posts with
POST /api/v1/channels/{id}/send. Its tile is a click-to-target like Slack's
(accent stripe along the bottom), and typed entries carry a keyboard mark.

The tiles: click any Slack or ProdCom transcript to point sends there; a
Send as menu (only for platforms with identities, hidden otherwise) picks
the ProdCom channel to speak as; the choice is saved with the tile so named
layouts remember it. Wording follows the role — "Send message to #ops…" /
"Send message to ProdCom as FOH…". The PIN pad's dots ride on a real
numeric input so a phone's keyboard appears. Outcome is an icon beside
Send (check / blocked, five seconds, sentence as tooltip). A pill on the
box's bottom edge trades box height for rows of quick-emoji keys, a row
at a time; the single row scrolls sideways on a narrow tile with Send
pinned in place.

The module guide documents the provider contract and the page bus
(window.proddashMessaging + proddash:messaging:* events) the tiles share;
the ProdCom mock gained the send route.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

modules/slack/module.json

@@ -1,9 +1,12 @@
 {
   "id": "slack",
   "name": "Slack",
-  "version": "1.2.1",
+  "version": "1.3.0",
   "proddash": ">=1.4.0",
-  "description": "Live transcripts of this location's Slack channels, plus PIN-protected sending as the location",
+  "description": "Live transcripts of this location's Slack channels; messages and reactions leave as the location through the Send Message module",
+  "provides": [
+    "messaging"
+  ],
   "client": "client.js",
   "server": "server.js",
   "style": "style.css",
@@ -18,14 +21,10 @@
   "configGroups": {
     "Slack account": {
       "collapsed": "whenSet",
-      "help": "Create a Slack app in the workspace (api.slack.com/apps → Create New App → From scratch) and, under OAuth & Permissions → User Token Scopes, add channels:history, channels:read, groups:history, groups:read, chat:write, users:read, reactions:write (emoji reactions) and emoji:read (the workspace's custom emoji). Sign in to Slack as this location's account — the one named for the campus — open the app's OAuth & Permissions page and press Install to Workspace (or Reinstall to Workspace), then copy the User OAuth Token (xoxp-…) it shows and paste it here: messages from this machine are then literally from the location. A bot token (xoxb-…) works too; it posts as the app, with \"Send as\" naming the location."
+      "help": "Create a Slack app in the workspace (api.slack.com/apps → Create New App → From scratch) and, under OAuth & Permissions → User Token Scopes, add channels:history, channels:read, groups:history, groups:read, chat:write, users:read, reactions:write (emoji reactions) and emoji:read (the workspace's custom emoji). Sign in to Slack as this location's account — the one named for the campus — open the app's OAuth & Permissions page and press Install to Workspace (or Reinstall to Workspace), then copy the User OAuth Token (xoxp-…) it shows and paste it here: messages sent from this machine through the Send Message module are then literally from the location. A bot token (xoxb-…) works too; it posts as the app, with \"Send as\" naming the location."
     },
     "Channels": {
-      "help": "Every channel picked here becomes its own transcript tile in the ＋ picker, titled with the channel's name. The Send message and Quick replies tiles post to whichever transcript was clicked last — its bottom edge lights up in the accent colour — and until one is clicked, to the first channel here whose transcript is on that dashboard: with a single transcript up, that one. A send never goes to a channel the dashboard is not showing. Only channels the account has joined are listed; join one in Slack first. Each channel is read on its own schedule, all of them together kept inside Slack's rate limit."
-    },
-    "Sending": {
-      "toggle": "sendEnabled",
-      "help": "Messages and emoji reactions leave this machine only after the PIN is entered — on a Send or Quick replies tile, or in the reaction menu a right-click on a transcript message opens. One PIN unlocks every Slack tile on that dashboard page until Auto-lock minutes pass without a send; a reload asks again. Sending stays refused until a 4–8 digit PIN is set here. A message goes to the channel of the transcript clicked last. Quick emojis are sent with one press from the Send message tile and offered first when reacting. Quick replies are one per line, Label | Message, with an optional | #channel-name to bind that one to a channel: a bound reply always goes there, whichever transcript is selected."
+      "help": "Every channel picked here becomes its own transcript tile in the ＋ picker, titled with the channel's name, and a destination the Send Message module's tiles can post to: a click on a transcript points them at its channel (its bottom edge lights up in the accent colour) — that is the only way a Slack channel is chosen; the Send as menu is for platforms that send as an identity. Only channels the account has joined are listed; join one in Slack first. Each channel is read on its own schedule, all of them together kept inside Slack's rate limit."
     }
   },
   "configSchema": {
@@ -41,7 +40,7 @@
       "label": "Send as",
       "default": "",
       "group": "Slack account",
-      "help": "Only used with a bot token — a user token always sends as its own account; needs the chat:write.customize scope."
+      "help": "Only used with a bot token — a user token always sends as its own account; needs the chat:write.customize scope. Applies to messages the Send Message module posts through this account."
     },
     "channels": {
       "type": "multiselect",
@@ -49,7 +48,7 @@
       "default": [],
       "group": "Channels",
       "optionsRoute": "/channels",
-      "help": "One transcript tile per channel; until a transcript is clicked, sends go to the first channel here that the dashboard is actually showing. Only channels the account has joined are listed — join one in Slack first."
+      "help": "One transcript tile per channel, and one destination each for the Send Message module. Only channels the account has joined are listed — join one in Slack first."
     },
     "pollSeconds": {
       "type": "number",
@@ -69,39 +68,6 @@
       "label": "Thread replies",
       "default": false,
       "group": "Transcript"
-    },
-    "sendEnabled": {
-      "type": "switch",
-      "label": "Sending",
-      "default": false,
-      "group": "Sending"
-    },
-    "pin": {
-      "type": "password",
-      "label": "PIN",
-      "default": "",
-      "group": "Sending",
-      "help": "4–8 digits; the pad unlocks by itself once they are all in."
-    },
-    "pinIdleMinutes": {
-      "type": "number",
-      "label": "Auto-lock (min)",
-      "default": 10,
-      "group": "Sending"
-    },
-    "quickReplies": {
-      "type": "text",
-      "label": "Quick replies",
-      "default": "",
-      "group": "Sending",
-      "help": "One per line: Label | Message. Add | #channel-name to bind one to a channel — it then ignores which transcript is selected."
-    },
-    "quickEmojis": {
-      "type": "string",
-      "label": "Quick emojis",
-      "default": "👍 🙏 ✅ 👀 🎉",
-      "group": "Sending",
-      "help": "Emoji or :codes: separated by spaces, eight at most. One press sends one from the Send message tile; they also head the reaction menu."
     }
   },
   "instanceSchema": {