chore: shorten DAY_MAP keys

src/shared/types/CourseMeeting.ts

@@ -4,13 +4,13 @@ import { Serialized } from 'chrome-extension-toolkit';
  * a map of the days of the week that a class is taught, and the corresponding abbreviation
  */
 export const DAY_MAP = {
-    MON: 'Monday',
-    TUE: 'Tuesday',
-    WED: 'Wednesday',
-    THU: 'Thursday',
-    FRI: 'Friday',
-    SAT: 'Saturday',
-    SUN: 'Sunday',
+    M: 'Monday',
+    T: 'Tuesday',
+    W: 'Wednesday',
+    TH: 'Thursday',
+    F: 'Friday',
+    S: 'Saturday',
+    SU: 'Sunday',
 } as const;
 
 /** A day of the week that a class is taught */