feat: export/import functionality (backup/restore/share with friends) + a new input component (#433)

* feat: export schedule function to be added to handler

* feat: use UserScheduleStore and return json

* feat: download functionality

* feat: oh wow we already have a blob download util that is very very nice

* feat: return empty json if none found

* feat: import function completion

* feat: file uploading done

* feat: new input component-stories made-settings input replaced with component

* feat: attempt 1 to hook settings.tsx to importSchedule

* feat: it works horray aka using right Course constructor it works

* chore: fix jsdoc

* chore: comments and debug style

* docs: extra comment

* feat: name of schedule more user friendly

* feat: reworked how schedule is passed and check for file being schedule

* feat: color is kept on import

* fix: add sendResponse to exportSchedule

---------

Co-authored-by: doprz <52579214+doprz@users.noreply.github.com>

src/pages/background/lib/addCourse.ts

@@ -4,19 +4,23 @@ import { getUnusedColor } from '@shared/util/colors';
 
 /**
  * Adds a course to a user's schedule.
+ *
  * @param scheduleId - The id of the schedule to add the course to.
  * @param course - The course to add.
+ * @param hasColor - If the course block already has colors manually set
  * @returns A promise that resolves to void.
  * @throws An error if the schedule is not found.
  */
-export default async function addCourse(scheduleId: string, course: Course): Promise<void> {
+export default async function addCourse(scheduleId: string, course: Course, hasColor = false): Promise<void> {
     const schedules = await UserScheduleStore.get('schedules');
     const activeSchedule = schedules.find(s => s.id === scheduleId);
     if (!activeSchedule) {
         throw new Error('Schedule not found');
     }
 
-    course.colors = getUnusedColor(activeSchedule, course);
+    if (!hasColor) {
+        course.colors = getUnusedColor(activeSchedule, course);
+    }
     activeSchedule.courses.push(course);
     activeSchedule.updatedAt = Date.now();
     await UserScheduleStore.set('schedules', schedules);