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>

pixel/editor.go

@@ -23,7 +23,7 @@ type EditorOptions struct {
 
 type Edit struct {
 	// Element is laid out; Input takes the focus.
-	Element, Input              *ui.Element
+	Element, Input              ui.Element
 	Changed, Submitted, Focused bool
 	// Line is the caret's line, from 0.
 	Line int
@@ -53,7 +53,7 @@ func Editor(c *ui.Context, value *string, o EditorOptions) Edit {
 	if o.EnterSends && !o.Multiline {
 		panic("pixel: EnterSends needs a multi-line field")
 	}
-	shell, base, _ := Shell(c, func() *ui.Element {
+	shell, base, _ := Shell(c, func() ui.Element {
 		return ui.Box(c).Focusable().Role(ui.RoleTextField).Label(o.Label).Disabled(o.Disabled)
 	})
 	s := ui.Local(base, editKey{}, func() editState { return editState{} })
@@ -73,7 +73,7 @@ func Editor(c *ui.Context, value *string, o EditorOptions) Edit {
 		base.Description(*value)
 	}
 	width, check := WrapWidth(c, shell)
-	env := editEnv{multi: o.Multiline, sends: o.EnterSends, maxLen: o.MaxLength, mask: o.Mask, width: width, dot: k.dot, read: c.ReadClipboard, write: func(v string) { s.clip, s.clipped = v, true }}
+	env := editEnv{multi: o.Multiline, sends: o.EnterSends, maxLen: o.MaxLength, mask: o.Mask, width: width, dot: k.dot, read: c.Services().ReadClipboard, write: func(v string) { s.clip, s.clipped = v, true }}
 	shown := s.view(o.Mask, true)
 	caret := s.caret + s.composeCaret
 	lines := editLayout(shown, width, o.Multiline)