Messaging · People: members, a profile card, online status and a status setter

MemberList sets members online and offline by name, each group a list
under its count. A press or an arrow chooses one; Enter or a double
press acts on them; offline members go quiet. UserProfileCard shows a
person's picture with presence, name and standing, title, status, the
time in their zone, and Message and Call, each only with a handler.
OnlineStatus draws a presence's dot and word; Presence now names itself
and gives its color, in data_display, its one home.

StatusSetter holds a draft seeded from the owner's status: an emoji
from a picker field, words in its own text field, and when they clear.
Suggestions fill all three; Save hands the status over and Clear status
removes it. The emoji field reuses the date pickers' field, whose
trigger ignores the Enter release after a pick.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

TASKS.md

@@ -99,7 +99,7 @@ Per-component lines live in `tasks/`. Tags there:
 - [x] T27c Files · Find and look
 - [x] T27d Files · Transfers
 - [x] T28a Messaging · Channels
-- [ ] T28b Messaging · Messages
+- [x] T28b Messaging · Messages
 - [ ] T28c Messaging · People
 - [ ] T28d Messaging · Calls
 - [ ] T28e Messaging · Stickers and GIFs
@@ -334,3 +334,4 @@ Per-component lines live in `tasks/`. Tags there:
 | T27d | 1 | FAIL | a press on a finished download's Show button also opened the file through its row |
 | T27d | 2 | PASS | |
 | T28a | 1 | PASS | |
+| T28b | 1 | PASS | |