Convert task priority to enum so it is now sortable

src/types/task.ts

@@ -6,6 +6,7 @@ export type Task = {
   fullLabel: string;
   tags: string[];
   priority: TaskPriority;
+  priorityStr: string;
   createdDate?: Dayjs;
   startDate?: Dayjs;
   scheduledDate?: Dayjs;
@@ -19,10 +20,11 @@ export type Task = {
   reminder?: string;  
 }
 
-export type TaskPriority = 
-  | 'lowest'
-  | 'low'
-  | 'normal'
-  | 'medium'
-  | 'high'
-  | 'highest';
+export enum TaskPriority {
+  LOWEST,
+  LOW,
+  NORMAL,
+  MEDIUM,
+  HIGH,
+  HIGHEST,
+};