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/difficultyselect.go

@@ -0,0 +1,55 @@
+package account
+
+import (
+	"fmt"
+	"log/slog"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/icon"
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type DifficultySelectOptions struct {
+	Disabled bool
+}
+
+type DifficultySelectResult struct {
+	Element *ui.Element
+	Changed bool
+}
+
+var levels = []string{"easy", "normal", "hard", "nightmare"}
+
+// DifficultySelect picks EASY to NIGHTMARE, a skull a step.
+func DifficultySelect(c *ui.Context, text string, chosen *int, o DifficultySelectOptions) DifficultySelectResult {
+	k := pixel.K(c)
+	choice("DifficultySelect", chosen, len(levels))
+	old := *chosen
+	// Arrows choose at once; the cursor is the choice.
+	shell, base, st, _ := pixel.Pad(c, text, 1, len(levels), 140, 16, chosen, o.Disabled)
+	base.Description(fmt.Sprintf("%s, %d", k.Msg(levels[*chosen]), *chosen+1))
+	at := *chosen
+	shell.Draw(func(p *ui.Painter, r ui.Rect) {
+		g := k.Canvas(p, r)
+		for i, l := range levels {
+			y, ink := i*16, pixel.Ink
+			if i == len(levels)-1 {
+				ink = pixel.Bad
+			}
+			if i == at {
+				g.Text(2, y+2, "▶", pixel.Accent, 1)
+			}
+			g.Text(14, y+2, k.Msg(l), ink, 1)
+			for s := range i + 1 {
+				g.Sprite(140-14*(s+1), y+2, icon.Skull, 0, ink, 1)
+			}
+		}
+		g.Finish(st)
+	})
+	res := DifficultySelectResult{Element: shell, Changed: *chosen != old}
+	if res.Changed {
+		slog.Debug("8bit: difficulty", "label", text, "level", levels[*chosen])
+	}
+	return res
+}