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.

shared/places.js

@@ -9,7 +9,13 @@
 export function placesOn(places, group, labels, day, date = null) {
   const on = (places || [])
     .filter((p) => p.groups.includes(group) && p.day === day && (!p.date || p.date === date))
-    .map((p) => ({ place: p.place, text: p.text, subgroup: p.subgroups.find((s) => s.group === group)?.label || null }));
+    .map((p) => ({
+      place: p.place,
+      text: p.text,
+      subgroup: p.subgroups.find((s) => s.group === group)?.label || null,
+      // "13:40": the note holds from that lesson on, not the whole day.
+      ...(p.from && { from: p.from }),
+    }));
   const whole = on.filter((p) => !p.subgroup);
   for (const p of on)
     if (