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>

go.mod

@@ -3,7 +3,7 @@ module git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI
 go 1.27.1
 
 require (
-	github.com/egoist/mygo v0.2.10
+	github.com/egoist/mygo v0.5.5
 	rsc.io/qr v0.2.0
 )
 
@@ -11,4 +11,5 @@ require (
 	github.com/ebitengine/purego v0.11.1 // indirect
 	github.com/go-text/typesetting v0.3.5 // indirect
 	golang.org/x/image v0.46.0 // indirect
+	golang.org/x/text v0.43.0 // indirect
 )