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/startmenu.go

@@ -25,7 +25,7 @@ type StartMenuOptions struct {
 }
 
 type StartMenuResult struct {
-	Element *ui.Element
+	Element ui.Element
 	// Launched is the program run this frame, as "GAMES/SNAKE".
 	Launched string
 }
@@ -148,9 +148,9 @@ func (m *start) keys(short func(ui.Modifiers, ui.Key) bool, ps []Program) string
 }
 
 // list shows each open level beside its parent row.
-func (m *start) list(c *ui.Context, k pixel.Kit, anchor *ui.Element, ps []Program) string {
+func (m *start) list(c *ui.Context, k pixel.Kit, anchor ui.Element, ps []Program) string {
 	run := ""
-	ui.PopoverBase(c, anchor, &m.open, func(panel *ui.Element) {
+	ui.PopoverBase(c, anchor, &m.open, func(panel ui.Element) {
 		// Only a pointer that moves lights the row under it.
 		px, py, over := panel.PointerPosition()
 		moved := over && [2]float32{px, py} != m.ptr