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/pad.go

@@ -3,9 +3,9 @@ package pixel
 import "github.com/egoist/mygo/ui"
 
 // Pad is a focusable grid; it returns the picked cell.
-func Pad(c *ui.Context, text string, cols, n, cw, ch int, cur *int, disabled bool) (shell, base *ui.Element, st State, picked int) {
+func Pad(c *ui.Context, text string, cols, n, cw, ch int, cur *int, disabled bool) (shell, base ui.Element, st State, picked int) {
 	k := K(c)
-	shell, base, st = Shell(c, func() *ui.Element {
+	shell, base, st = Shell(c, func() ui.Element {
 		return ui.Box(c).Focusable().Role(ui.RoleGroup).Label(text).Disabled(disabled)
 	})
 	shell.Size(k.D(cols*cw), k.D((n+cols-1)/cols*ch))