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>

overlay/pausemenu.go

@@ -13,7 +13,7 @@ type PauseMenuOptions struct {
 }
 
 type PauseMenuResult struct {
-	Element *ui.Element
+	Element ui.Element
 	// Chosen is RESUME 0, OPTIONS 1, QUIT 2, or -1.
 	Chosen int
 }
@@ -28,7 +28,7 @@ func PauseMenu(c *ui.Context, paused *bool, o PauseMenuOptions) PauseMenuResult
 	was := *paused
 	res := PauseMenuResult{Chosen: -1}
 	items := []string{k.Msg("resume"), k.Msg("options"), k.Msg("quit")}
-	res.Element = ui.DialogBase(c, paused, func(back, panel *ui.Element) {
+	res.Element = ui.DialogBase(c, paused, func(back, panel ui.Element) {
 		deep, light := dark(k)
 		dim(k, back, deep, 10)
 		title := k.Msg("paused")