feat: Enhance session handling in timetable and UI

- Introduced session types (exams, credits, consultations, coursework defenses) with distinct icons and colors for better visibility in the UI.
- Updated PlansScreen, ScheduleScreen, and WeekGrid to display session information appropriately.
- Modified CalendarView and PlansView to include session indicators in the calendar and plans.
- Enhanced LessonCard and CompactLesson to show session details and adjust styling based on session presence.
- Added new SessionMark component for consistent session representation across Android and iOS.
- Updated server logic to handle session entries from external documents, ensuring accurate timetable representation.
- Improved date parsing to accommodate session-related dates in various formats.
- Added tests to verify session handling and date parsing functionality.

server/timetable.js

@@ -37,7 +37,7 @@ function lessonOut(lesson, group, people, date, status, calendar) {
  * days: one entry per date from `from`, with the lessons that take place that day.
  * weekly: the Word rows by weekday, for when dates cannot be calculated.
  */
-export function timetable({ file, schedule, calendar, group, from, days, range, today }) {
+export function timetable({ file, schedule, calendar, group, from, days, range, today, session: extra = [] }) {
   if (!schedule.groups.includes(group)) {
     throw apiError(404, "group_not_found", `В документе нет группы ${group}.`);
   }
@@ -58,13 +58,19 @@ export function timetable({ file, schedule, calendar, group, from, days, range,
     : null;
   // range=semester: every day of the semester `today` falls in, so a client can keep
   // the whole term offline; a session schedule keeps its own span. Without either it
-  // keeps the plain from/days window.
+  // keeps the plain from/days window. Exams and credits from other documents may follow
+  // the last week of the semester: the span then runs on to the last of them (up to 60 days).
   if (range === "semester") {
     const current = semesterView(calendar, schedule, today || from);
     const span = current?.semester || session;
     if (span) {
       from = span.start;
-      const length = Math.round((Date.parse(span.end) - Date.parse(from)) / DAY_MS) + 1;
+      const limit = addDays(span.end, 60);
+      const end = [span.end, ...extra.flatMap((e) => (e.lesson.date ? [e.lesson.date] : e.lesson.dates))]
+        .filter((d) => d >= from && d <= limit)
+        .sort()
+        .at(-1);
+      const length = Math.round((Date.parse(end) - Date.parse(from)) / DAY_MS) + 1;
       count = Math.min(Math.max(length, 1), MAX_SEMESTER_DAYS);
     }
   }
@@ -86,6 +92,10 @@ export function timetable({ file, schedule, calendar, group, from, days, range,
         if (status === "yes" || status === "maybe")
           dayLessons.push(lessonOut(entry.lesson, group, entry, date, status, calendar));
       }
+    // Session events printed with their own date need no week table.
+    for (const entry of extra)
+      if (entry.lesson.date === date || entry.lesson.dates?.includes(date))
+        dayLessons.push(lessonOut(entry.lesson, group, entry, date, "yes", calendar));
     dayLessons.sort((a, b) => a.start.localeCompare(b.start));
     out.push({
       date,
@@ -117,7 +127,12 @@ export function timetable({ file, schedule, calendar, group, from, days, range,
     note: view || session
       ? null
       : "Семестр этого расписания не найден в таблице недель: даты не рассчитаны, смотрите строки Word (weekly).",
-    subgroups: subgroupsOf(schedule, group),
+    subgroups: [
+      ...new Set([
+        ...subgroupsOf(schedule, group),
+        ...extra.map((e) => e.lesson.subgroups?.find((s) => s.group === group)?.label).filter(Boolean),
+      ]),
+    ].sort((a, b) => a.localeCompare(b, "ru", { numeric: true })),
     bells: calendar?.bells || [],
     from,
     days: out,