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>

internal/archtest/archtest_test.go

@@ -166,6 +166,10 @@ func TestNoBannedCalls(t *testing.T) {
 				if id, ok := sel.X.(*ast.Ident); sel.Sel.Name == "Shortcut" && !pkg && !(ok && id.Name == "c") {
 					t.Errorf("%s: %s.Shortcut skips the enabled check; use pixel.Shortcut", f.path, receiver(sel.X))
 				}
+				// It moves the focus before an overlay notes its opener.
+				if sel.Sel.Name == "AutoFocus" && !pkg {
+					t.Errorf("%s: %s.AutoFocus loses an overlay's opener; use pixel.AutoFocus", f.path, receiver(sel.X))
+				}
 			}
 			return true
 		})