Slack 1.2.0: emoji everywhere, reactions from the transcript, quick emojis, one PIN per page

Emoji: every standard :code: in a message becomes its character (the full
Slack table ships as emoji.json, from iamcal/emoji-data, MIT); the
workspace's custom emoji come from emoji.list and draw as images proxied
through the module; skin tones work on both.

Reactions: messages show their reactions as pills (the location's own in
the accent). A right-click on a message opens a menu — the admin's quick
emojis, then a search over every emoji — and a click on a pill adds or
takes back the location's reaction. It goes through the same gate as a
send (reactions:write on the app).

Rows follow the ProdCom transcript's layout: a square profile image or
bot icon (initials on a hue tint when there is none), the name line with
its time, the text, the reactions. The accent bar on the location's own
messages is gone.

Send message: the admin's quick emojis sit left of Send, one press sends
one. The PIN pad submits by itself once the PIN's digits are in (the
server sends the length, never the PIN) — no ✓ key; in a tile too short
for the keypad the dots and a hint remain and the keyboard still works.
One PIN unlocks every Slack tile on the page (Send message, Quick replies,
reactions) until auto-lock; a remount keeps it, a reload asks again.

The transcript's gear lists its three switches without a group. The mock
serves reactions.add/remove, emoji.list and profile images.

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

modules/slack/EMOJI-DATA-LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2013 Cal Henderson
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.