fix: align frontend status types with API string enum serialization

ASP.NET serializes C# enums as strings by default ("Pending", "Active"),
but frontend types used numeric values (0, 1). Changed WorkTaskStatus and
NoteType to string values matching API output.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

TaskTracker.Web/src/types/index.ts

@@ -1,16 +1,16 @@
 export const WorkTaskStatus = {
-  Pending: 0,
-  Active: 1,
-  Paused: 2,
-  Completed: 3,
-  Abandoned: 4,
+  Pending: 'Pending',
+  Active: 'Active',
+  Paused: 'Paused',
+  Completed: 'Completed',
+  Abandoned: 'Abandoned',
 } as const
 export type WorkTaskStatus = (typeof WorkTaskStatus)[keyof typeof WorkTaskStatus]
 
 export const NoteType = {
-  PauseNote: 0,
-  ResumeNote: 1,
-  General: 2,
+  PauseNote: 'PauseNote',
+  ResumeNote: 'ResumeNote',
+  General: 'General',
 } as const
 export type NoteType = (typeof NoteType)[keyof typeof NoteType]