feat: course color generation (#179)

* feat: course color generation

* feat: add proper TS for hex colors

* refactor: fix oklab and improve contrast ratios

* fix: update HexColor type

* refactor: update color switch point

* refactor: color-related functions and types

* fix: imports and TS issues

* fix: imports and TS issues

* chore: add no-restricted-syntax ForInStatement

* chore(docs): add jsdoc

---------

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

src/views/hooks/useSchedules.ts

@@ -70,10 +70,19 @@ export default function useSchedules(): [active: UserSchedule, schedules: UserSc
     return [activeSchedule, schedules];
 }
 
+/**
+ * Returns the active schedule.
+ * @returns The active schedule.
+ */
 export function getActiveSchedule(): UserSchedule {
     return schedulesCache[activeIndexCache] ?? errorSchedule;
 }
 
+/**
+ * Replaces the old schedule with the new schedule.
+ * @param oldSchedule - The old schedule to be replaced.
+ * @param newSchedule - The new schedule to replace the old schedule.
+ */
 export async function replaceSchedule(oldSchedule: UserSchedule, newSchedule: UserSchedule) {
     const schedules = await UserScheduleStore.get('schedules');
     let oldIndex = schedules.findIndex(s => s.id === oldSchedule.id);