cmd/drover: replace MessageBox stub with Wails GUI (internal/gui.Run)

Bare 'drover' (and 'drover gui') no longer pop a Win32 MessageBox —
they hand off to internal/gui which mounts a real Wails window with
the Classic React variant. The old gui_windows.go / gui_other.go
files are removed; their job is now done by internal/gui/run.go.

Auto-update on startup is unchanged — still runs before gui.Run().

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

go.mod

@@ -5,13 +5,40 @@ go 1.23
 require (
 	github.com/minio/selfupdate v0.6.0
 	github.com/spf13/cobra v1.10.2
-	golang.org/x/mod v0.21.0
+	github.com/wailsapp/wails/v2 v2.12.0
+	golang.org/x/mod v0.23.0
+	golang.org/x/sys v0.30.0
 )
 
 require (
 	aead.dev/minisign v0.2.0 // indirect
+	git.sr.ht/~jackmordaunt/go-toast/v2 v2.0.3 // indirect
+	github.com/bep/debounce v1.2.1 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
+	github.com/godbus/dbus/v5 v5.1.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/gorilla/websocket v1.5.3 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/jchv/go-winloader v0.0.0-20210711035445-715c2860da7e // indirect
+	github.com/labstack/echo/v4 v4.13.3 // indirect
+	github.com/labstack/gommon v0.4.2 // indirect
+	github.com/leaanthony/go-ansi-parser v1.6.1 // indirect
+	github.com/leaanthony/gosod v1.0.4 // indirect
+	github.com/leaanthony/slicer v1.6.0 // indirect
+	github.com/leaanthony/u v1.1.1 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
+	github.com/samber/lo v1.49.1 // indirect
 	github.com/spf13/pflag v1.0.9 // indirect
-	golang.org/x/crypto v0.0.0-20211209193657-4570a0811e8b // indirect
-	golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
+	github.com/tkrajina/go-reflector v0.5.8 // indirect
+	github.com/valyala/bytebufferpool v1.0.0 // indirect
+	github.com/valyala/fasttemplate v1.2.2 // indirect
+	github.com/wailsapp/go-webview2 v1.0.22 // indirect
+	github.com/wailsapp/mimetype v1.4.1 // indirect
+	golang.org/x/crypto v0.33.0 // indirect
+	golang.org/x/net v0.35.0 // indirect
+	golang.org/x/text v0.22.0 // indirect
 )