internal/gui: Wails app with Classic React variant + theme toggle

- app.go: App struct with stub bindings (RunCheck/StartEngine/
  StopEngine/GetStatus/Version) — emits check:result, check:done,
  engine:status, stats:update events. Real backend lands in Phase 1.
- run.go: wails.Run() with frameless 480x640 fixed window, Classic
  dark bg matching theme.
- embed.go: //go:embed all:frontend/dist for the Vite build output.
- frontend/: Vite + React project derived from `wails init -t react`.
  Removed default template assets and wired Classic variant from
  docs/design/v2/.
  - components/Classic.jsx: variant 1 with custom title bar
    (drag region, sun/moon theme toggle, min/close hooked to
    Wails WindowMinimise/Quit).
  - components/shared.jsx: useDrover hook adapted to call Wails
    bindings and listen on backend events instead of mock SCENARIOS.
    Added IconSun + IconMoon for the title-bar toggle.
  - App.jsx: owns mode state, wraps setMode in
    document.startViewTransition so the title-bar toggle gives a
    circle-reveal sweep from the cursor.
  - style.css: clean reset (overflow hidden, no scrollbars, brand
    background) — replaces the wails-react-template defaults.
  - wailsjs/go/gui/App.js: hand-written bindings since our App
    struct lives in package gui rather than the standard top-level
    main; `wails generate module` would have written package main
    bindings here.
- build/: standard wails artifacts (icon, manifest); will be
  consumed by `wails build` once we wire it through CI.

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

internal/gui/run.go

@@ -0,0 +1,50 @@
+package gui
+
+import (
+	"github.com/wailsapp/wails/v2"
+	"github.com/wailsapp/wails/v2/pkg/options"
+	"github.com/wailsapp/wails/v2/pkg/options/assetserver"
+	"github.com/wailsapp/wails/v2/pkg/options/windows"
+)
+
+// Run launches the Wails GUI. It blocks until the window is closed.
+//
+// Window size matches the React design (480×640) but is resizable so
+// users on smaller displays can shrink it. Title shows the version.
+func Run(version string) error {
+	app := NewApp(version)
+
+	// Frameless = no native Windows chrome; the React Classic component
+	// renders its own title bar (brand mark, version, theme toggle,
+	// min/close icons) so we deliberately suppress the OS chrome to
+	// avoid stacking two title bars.
+	// The Classic React component renders a fixed 480×640 surface, so we
+	// pin the host window to exactly the same. Allowing resize would
+	// expose the bare Wails background colour around the React canvas
+	// (the "blue strip on the side" issue from early testing).
+	const w, h = 480, 640
+	return wails.Run(&options.App{
+		Title:         "Drover-Go " + version,
+		Width:         w,
+		Height:        h,
+		MinWidth:      w,
+		MinHeight:     h,
+		MaxWidth:      w,
+		MaxHeight:     h,
+		DisableResize: true,
+		Frameless:     true,
+		AssetServer: &assetserver.Options{
+			Assets: Assets,
+		},
+		BackgroundColour: &options.RGBA{R: 28, G: 29, B: 32, A: 1}, // matches Classic dark bg
+		OnStartup:        app.Startup,
+		Windows: &windows.Options{
+			WebviewIsTransparent:              false,
+			WindowIsTranslucent:               false,
+			DisableFramelessWindowDecorations: false,
+		},
+		Bind: []interface{}{
+			app,
+		},
+	})
+}