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/table.go

@@ -28,7 +28,7 @@ type TableOptions struct {
 }
 
 type TableResult struct {
-	Element *ui.Element
+	Element ui.Element
 	// Sorted reports a header click; sort the rows by *sort.
 	Changed, Submitted, Sorted bool
 }
@@ -51,11 +51,11 @@ func Table(c *ui.Context, text string, cols []Column, rows int, sort *Sort, sele
 		st.Selected = nil
 	}
 	res := TableResult{Element: box}
-	var list *ui.Element
+	var list ui.Element
 	box.Children(func() {
 		ui.Row(c).FocusGroup(ui.Horizontal).Role(ui.RoleRow).Children(func() {
 			for i, col := range cols {
-				shell, base, hs := pixel.Shell(c, func() *ui.Element {
+				shell, base, hs := pixel.Shell(c, func() ui.Element {
 					return ui.ButtonBase(c).Role(ui.RoleColumnHeader).Label(col.Title).Disabled(o.Disabled)
 				})
 				if base.Clicked() {