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.

src/data_display/avatar.rs

@@ -18,7 +18,7 @@ pub enum Presence {
 }
 
 impl Presence {
-    fn color(self, colors: &Palette) -> Hsla {
+    pub fn color(self, colors: &Palette) -> Hsla {
         match self {
             Self::Online => colors.success,
             Self::Away => colors.warning,
@@ -26,6 +26,15 @@ impl Presence {
             Self::Offline => colors.fg_subtle,
         }
     }
+
+    pub fn label(self) -> &'static str {
+        match self {
+            Self::Online => "Online",
+            Self::Away => "Away",
+            Self::Busy => "Busy",
+            Self::Offline => "Offline",
+        }
+    }
 }
 
 /// Up to two capitals from a name's first and last words.