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>

tabletop/deck.go

@@ -15,7 +15,7 @@ type DeckOptions struct {
 }
 
 type DeckResult struct {
-	Element *ui.Element
+	Element ui.Element
 	// Drawn is a card taken this frame.
 	Drawn bool
 }
@@ -28,7 +28,7 @@ func Deck(c *ui.Context, text string, count int, o DeckOptions) DeckResult {
 		panic(fmt.Sprintf("tabletop: Deck of %d", count))
 	}
 	left := fmt.Sprintf(k.Msg("cards_left"), count)
-	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.RoleButton).Label(text).Description(left).Disabled(o.Disabled || count == 0)
 	})
 	res := DeckResult{Element: shell, Drawn: !base.IsDisabled() && base.Clicked()}