feat: Add Settings and Subjects screens with theme reveal functionality

- Implemented SettingsScreen for user preferences including theme selection, reminders, and notifications.
- Created SubjectsScreen to display subjects with upcoming lessons and associated details.
- Introduced ThemeReveal for a smooth transition between light and dark themes.
- Added support for managing notes and tasks related to subjects.
- Enhanced UI components for better user experience and accessibility.

scripts/snapshot-lines.js

@@ -27,7 +27,7 @@ export const lessonLine = (l) =>
 // "Занятия в Полоцке": a day of a group or subgroup in another town, not a lesson.
 const placeLine = (p) =>
   [
-    `@ ${p.date || DAYS[p.day]}`,
+    `@ ${p.date || DAYS[p.day]}${p.from ? ` с ${p.from}` : ""}`,
     p.text,
     [...p.groups, ...p.subgroups.map((s) => `${s.group}/${s.label.replace("Подгруппа ", "п")}`)].join(","),
   ].join(" | ");