changed window struct to include optionals where necessary

model_window.go

@@ -6,10 +6,10 @@ type WindowID int
 
 type Window struct {
 	ID          WindowID            `json:"id"`
-	Title       string       `json:"title"`
+	Title       Option[string]      `json:"title"`
-	AppID       string       `json:"app_id"`
+	AppID       Option[string]      `json:"app_id"`
-	PID         int          `json:"pid"`
+	PID         Option[int]         `json:"pid"`
-	WorkspaceID WorkspaceID  `json:"workspace_id"`
+	WorkspaceID Option[WorkspaceID] `json:"workspace_id"`
 	Urgent      bool                `json:"is_urgent"`
 	Floating    bool                `json:"is_floating"`
 	Focused     bool                `json:"is_focused"`