Upgrade MyGo to v0.5.5

Elements are now pass-scoped value handles: tests that read bounds
after a frame bind a ui.Handle. pixel tells frames apart by the build
pass's root, since the Tester clock no longer moves on its own.

Fix the regressions the upgrade brought:
- Clipboard reads in input handlers go through c.Services().
- MyGo notes an overlay's opener after building it, so AutoFocus
  inside lost it; pixel.AutoFocus focuses through a Handle, and
  archtest bans the raw call. Dialogs hand the focus back again.
- Elements around a press stay hovered: Tooltip tells a press-given
  focus by focus arriving under the pointer.
- The web host moves the Tester clock with real time, at most 500 ms
  a call, and gives components the real clock.

The gallery's source index also accepts CRLF checkouts.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

desk/appwindow.go

@@ -20,7 +20,7 @@ type AppWindowOptions struct {
 }
 
 type AppWindowResult struct {
-	Element *ui.Element
+	Element ui.Element
 	// Closed is the close box; Moved, a drag or arrow.
 	Closed, Moved bool
 }
@@ -64,7 +64,7 @@ func AppWindow(c *ui.Context, title string, x, y *int, o AppWindowOptions, conte
 		g.Frame(0, 0, g.W, g.H, pixel.Raised, pixel.Face)
 	}).Children(func() {
 		ui.Row(c).FillWidth().Gap(k.D(2)).AlignItems(ui.Center).Children(func() {
-			shell, base, st := pixel.Shell(c, func() *ui.Element {
+			shell, base, st := pixel.Shell(c, func() ui.Element {
 				return ui.Box(c).Focusable().Role(ui.RoleGroup).Label(title).Description(k.Msg("arrows_move")).Disabled(o.Disabled)
 			})
 			if !base.IsDisabled() {