Add chat components 321-345; named List rows, inert scroll views

Speech bubbles, a chat log that follows its end, a composer that sends
on Enter, typing dots, chat and channel lists, read receipts,
reactions, emoji and sticker pickers, mentions, date and unread rules,
system lines, member lists, user cards, a mailbox, mail reader and
letter, a notification bell, call controls, a voice meter, attachment
chips, link previews and polls.

pixel's editor takes EnterSends; display's Bubble takes a Fill and
exports EmojiSprite. data.List names its rows, which also lets typing
choose one. layout.ScrollArea and input.TextArea hold still under
Inert, and an inert scroll view leaves the Tab order until it wakes.

chat/callcontrols.go

@@ -0,0 +1,54 @@
+package chat
+
+import (
+	"log/slog"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/icon"
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type CallControlsOptions struct {
+	Disabled bool
+}
+
+type CallControlsResult struct {
+	Element         *ui.Element
+	Changed, HungUp bool
+}
+
+// CallControls toggles mute and camera, and hangs up.
+func CallControls(c *ui.Context, text string, muted, camera *bool, o CallControlsOptions) CallControlsResult {
+	k := pixel.K(c)
+	var res CallControlsResult
+	// A slash crosses a sprite that is off.
+	button := func(base func() *ui.Element, sp *pixel.Sprite, fill, ink pixel.Slot, off bool) bool {
+		shell, b, st := pixel.Shell(c, func() *ui.Element { return base().Disabled(o.Disabled).FocusRing(false) })
+		shell.Size(k.D(22), k.D(22)).Draw(func(p *ui.Painter, r ui.Rect) {
+			g := k.Canvas(p, r)
+			g.Frame(0, 0, 22, 22, pixel.Raised, fill)
+			g.Sprite(5, 5, sp, 0, ink, 1)
+			if off {
+				g.Line(4, 17, 17, 4, pixel.Bad)
+			}
+			g.Finish(st)
+		})
+		return b.Changed() || b.Clicked()
+	}
+	res.Element = ui.Row(c).Gap(k.D(4)).FocusGroup(ui.Horizontal).Role(ui.RoleToolbar).Label(text).Children(func() {
+		if button(func() *ui.Element { return ui.ToggleBase(c, muted).Label(k.Msg("mute")) }, icon.Mic, pixel.Face, pixel.Ink, *muted) {
+			res.Changed = true
+			slog.Debug("8bit: call mute", "label", text, "muted", *muted)
+		}
+		if button(func() *ui.Element { return ui.ToggleBase(c, camera).Label(k.Msg("camera")) }, icon.Camera, pixel.Face, pixel.Ink, !*camera) {
+			res.Changed = true
+			slog.Debug("8bit: call camera", "label", text, "on", *camera)
+		}
+		if button(func() *ui.Element { return ui.ButtonBase(c).Label(k.Msg("hang_up")) }, icon.Phone, pixel.Bad, pixel.AccentInk, false) {
+			res.HungUp = true
+			slog.Debug("8bit: call hung up", "label", text)
+		}
+	})
+	return res
+}