feat: add global tasks folder

src/model/taskLocation.ts

@@ -0,0 +1,14 @@
+import { Task } from "./task";
+
+export type TaskScope = "project" | "global";
+
+/** Where a task lives on disk (runtime; not stored in frontmatter). */
+export type TaskLocation = {
+	scope: TaskScope;
+	folderPath: string;
+};
+
+export type LocatedTask = {
+	task: Task;
+	location: TaskLocation;
+};