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/settings.go

@@ -47,11 +47,12 @@ func (k Kit) Now() time.Time    { return k.now }
 func (k Kit) Reduce() bool      { return k.reduce }
 
 type frame struct {
-	cur    Settings
-	at     time.Time
+	cur Settings
+	// pass is the root of the pass Use ran in.
+	pass   ui.Element
 	typing bool
 	// harbor holds the focus of controls turning off.
-	harbor *ui.Element
+	harbor ui.Element
 }
 
 type frameKey struct{}
@@ -63,7 +64,7 @@ func Use(c *ui.Context, s Settings) {
 	if f.cur.Palette != s.Palette {
 		slog.Debug("8bit: palette", "name", s.Palette.Name)
 	}
-	f.cur, f.at, f.typing, f.harbor = s, c.Now(), false, nil
+	f.cur, f.pass, f.typing, f.harbor = s, c.Root(), false, ui.Element{}
 	c.SetTheme(theme(s.Palette))
 }
 
@@ -103,7 +104,7 @@ func frameOf(c *ui.Context) *frame {
 
 func current(c *ui.Context) *frame {
 	f := frameOf(c)
-	if !f.at.Equal(c.Now()) {
+	if f.pass != c.Root() {
 		panic("pixel: Use was not called in this frame")
 	}
 	return f