Add desk components 466-485 and icon.Bomb

Twenty pieces of a retro desktop: Desktop, DesktopIcon, Taskbar,
StartMenu, AppWindow, Calculator, Notepad, Minesweeper, ControlPanel,
TrayIcons, ShutdownScreen, BootScreen, Screensaver, Snake, Dock,
RunDialog, DiskDefrag, WallpaperPicker, ClipboardPanel and LockScreen.

The calculator really adds up and calls division by zero GAME OVER;
Minesweeper and Snake are playable, first click always safe; START
cascades its submenus without moving the rows already open; windows
drag by whole dots; the screensaver's logo changes color at each wall
and sparkles in a corner; the defragmenter is oddly soothing. Clocks
that step back hold at zero, and typed or copied text never reaches
the log.

icon.Bomb is the new 12x12 mine.

desk/lockscreen.go

@@ -0,0 +1,50 @@
+package desk
+
+import (
+	"fmt"
+	"log/slog"
+	"strings"
+	"time"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type LockScreenOptions struct{}
+
+type LockScreenResult struct {
+	Element *ui.Element
+	// Unlocked is a key or click opening it this frame.
+	Unlocked bool
+}
+
+// LockScreen covers the window: time, date, PRESS ANY KEY.
+func LockScreen(c *ui.Context, text string, open *bool, o LockScreenOptions) LockScreenResult {
+	k := pixel.K(c)
+	now := k.Now()
+	if *open {
+		k.At(c, now.Truncate(time.Minute).Add(time.Minute))
+	}
+	clock := now.Format("15:04")
+	days, months := strings.Fields(k.Msg("days")), strings.Fields(k.Msg("months"))
+	date := fmt.Sprintf(k.Msg("day_date"), days[now.Weekday()], now.Day(), months[now.Month()-1], int(now.Month()))
+	press := k.Msg("press_any_key")
+	anchor, panel, woke := cover(c, k, text, open, false, func(g pixel.Canvas) {
+		g.Rect(0, 0, g.W, g.H, pixel.Well)
+		cy := g.H/2 - 40
+		g.Text((g.W-4*pixel.Measure(clock))/2, cy, clock, pixel.Ink, 4)
+		g.Text((g.W-pixel.Measure(date))/2, cy+4*pixel.LineHeight+4, date, pixel.Faint, 1)
+		// The prompt blinks on 4 fps steps; reduced, it holds.
+		if g.Step(4)%4 < 2 {
+			g.Text((g.W-pixel.Measure(press))/2, g.H-3*pixel.LineHeight, press, pixel.Accent, 1)
+		}
+	})
+	if panel != nil {
+		panel.Description(clock + ", " + date + ", " + press)
+	}
+	if woke {
+		slog.Debug("8bit: lock screen unlocked", "label", text)
+	}
+	return LockScreenResult{Element: anchor, Unlocked: woke}
+}