Add account components 386-405; Reduce setting, PinInput Cmd+V

Twenty account components: SettingsList, OptionCycler, KeyBindings,
ControllerMap, ProfileCard, CharacterCreator, LoginForm, PasswordGrid,
SessionList, LanguagePicker, PalettePicker, VolumeMixer,
DifficultySelect, AccessibilityOptions, AccountSwitcher, PlayerSelect,
TwoFactor, About, PatchNotes and FeedbackForm.

The components never check credentials, and no secret reaches the log:
LoginForm reports Submitted and the caller counts Failures; each new
failure clears the password, refocuses it, shakes the form and names no
field. TwoFactor builds on input.PinInput and drains an epoch-aligned
period bar. PalettePicker draws each tile in its own palette on a
pixel.Pad grid.

pixel.Settings.Reduce stills motion like the system preference, the
micro font gains '?', display.Face draws avatar faces anywhere, and
input.PinInput pastes on Cmd+V as native hosts send it.

account/playerselect.go

@@ -0,0 +1,56 @@
+package account
+
+import (
+	"fmt"
+	"log/slog"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type PlayerSelectOptions struct {
+	Disabled bool
+}
+
+type PlayerSelectResult struct {
+	Element *ui.Element
+	// Chosen is Enter, Space or a click on a row.
+	Changed, Chosen bool
+}
+
+// PlayerSelect points ▶ at 1 or 2 players in *players.
+func PlayerSelect(c *ui.Context, text string, players *int, o PlayerSelectOptions) PlayerSelectResult {
+	k := pixel.K(c)
+	if *players != 1 && *players != 2 {
+		panic(fmt.Sprintf("account: PlayerSelect of %d players", *players))
+	}
+	rows := []string{k.Msg("one_player"), k.Msg("two_players")}
+	// Two-scale text after a two-scale pointer and a gap.
+	gap := pixel.Measure("▶")*2 + 6
+	w := 0
+	for _, r := range rows {
+		w = max(w, pixel.Measure(r)*2+gap)
+	}
+	cur, old := *players-1, *players
+	shell, base, st, picked := pixel.Pad(c, text, 1, 2, w, 2*pixel.LineHeight+4, &cur, o.Disabled)
+	*players = cur + 1
+	base.Description(rows[cur])
+	res := PlayerSelectResult{Element: shell, Changed: *players != old, Chosen: picked >= 0}
+	at := cur
+	shell.Draw(func(p *ui.Painter, r ui.Rect) {
+		g := k.Canvas(p, r)
+		for i, s := range rows {
+			y := i * (2*pixel.LineHeight + 4)
+			if i == at {
+				g.Text(0, y+2, "▶", pixel.Accent, 2)
+			}
+			g.Text(gap, y+2, s, pixel.Ink, 2)
+		}
+		g.Finish(st)
+	})
+	if res.Changed || res.Chosen {
+		slog.Debug("8bit: player select", "label", text, "players", *players, "chosen", res.Chosen)
+	}
+	return res
+}