GUI subsystem: -H=windowsgui + AttachConsole, MB_TOPMOST on test window

drover.exe is now a GUI subsystem binary:
  - Double-click no longer flashes a console window — a clean
    smoke-test message box opens immediately.
  - When run from cmd / PowerShell, AttachConsole reattaches stdout
    and stderr to the parent terminal so '--version', 'check', etc.
    still print as expected.
  - MB_TOPMOST flag added to MessageBox so the window can't be
    obscured by other windows on launch (this was the actual cause
    of "I clicked but nothing happened" reports).

Verified locally: built with GOOS=windows GOARCH=amd64 -H=windowsgui;
running drover-gui.exe --version prints to PowerShell, drover-gui.exe
gui shows the message box on top of the active window.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cmd/drover/console_other.go

@@ -0,0 +1,5 @@
+//go:build !windows
+
+package main
+
+func attachToParentConsole() {}