feat: support named switchable layouts

internal/platform/platform_windows.go

@@ -168,7 +168,7 @@ func Run(configPath string, cfg config.Config, debug bool) error {
 	}
 	defer procKillTimer.Call(0, shiftTimer)
 
-	log.Printf("ready: Shift+drag snapping=%v, overlay=%v, %d hotkeys", cfg.ShiftDrag, cfg.Overlay.Enabled, len(e.hotkeys))
+	log.Printf("ready: layout=%q, Shift+drag snapping=%v, overlay=%v, %d hotkeys", cfg.ActiveLayout, cfg.ShiftDrag, cfg.Overlay.Enabled, len(e.hotkeys))
 	logMonitors()
 	var msg message
 	for {
@@ -419,7 +419,7 @@ func (e *engine) snapAtCursor(hwnd windows.Handle) (bool, string) {
 	e.mu.RUnlock()
 	l, ok := cfg.LayoutFor(mi.device())
 	if !ok {
-		return false, fmt.Sprintf("no layout matches monitor %s and no wildcard layout exists", mi.device())
+		return false, fmt.Sprintf("active layout %q has no entry for monitor %s and no wildcard fallback", cfg.ActiveLayout, mi.device())
 	}
 	work := toLayoutRect(mi.Work)
 	zi := layout.ZoneAt(work, l.Zones, 0, layout.Point{X: p.X, Y: p.Y})
@@ -690,5 +690,5 @@ func (e *engine) reloadIfChanged() {
 		_ = e.registerHotkeys()
 		return
 	}
-	log.Printf("configuration reloaded")
+	log.Printf("configuration reloaded: active layout=%q", cfg.ActiveLayout)
 }