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>

data/list.go

@@ -15,7 +15,7 @@ type ListOptions struct {
 }
 
 type ListResult struct {
-	Element *ui.Element
+	Element ui.Element
 	// Submitted is Enter or a double click on a row.
 	Changed, Submitted bool
 }
@@ -33,7 +33,7 @@ func List(c *ui.Context, text string, n int, selected *int, o ListOptions, name
 	if off {
 		st.Selected = nil
 	}
-	var e *ui.Element
+	var e ui.Element
 	box.Children(func() {
 		e = ui.List(c, st, n, pixel.Lazy(c, func(i int) {
 			on := i == *selected