feat: implement changes tracking for university documents

- Added a new data structure `ScheduleChanges` to represent changes when a university document is republished.
- Implemented methods to read and write changes to a local JSON file.
- Enhanced the `Repository` class to detect changes between the current and fresh timetable versions.
- Updated the `MainViewModel` to expose changes to the UI and handle marking changes as seen.
- Created UI components for displaying changes in both Home and Settings screens.
- Added support for changes in iOS views, including a new `ChangesCard` and `ChangesSheet`.
- Implemented logic to compare timetable versions and identify added, removed, and changed lessons.

android/app/src/main/kotlin/org/xtimms/psu/schedule/data/Changes.kt

@@ -0,0 +1,99 @@
+package org.xtimms.psu.schedule.data
+
+import kotlinx.serialization.Serializable
+
+// What changed for the group when the university republished its document, as the PWA reports it
+// (shared/lessons.js diffSchedules): the new timetable is compared with the copy on the device.
+
+/** A Word row of the timetable: a weekday's lesson, or a lesson on its own date. */
+@Serializable
+data class ChangedLesson(val day: Int, val date: String? = null, val lesson: Lesson)
+
+@Serializable
+data class FieldChange(val label: String, val from: String, val to: String)
+
+@Serializable
+data class LessonChange(val before: ChangedLesson, val after: ChangedLesson, val fields: List<FieldChange>)
+
+@Serializable
+data class ScheduleChanges(
+    val document: String,
+    val group: String,
+    val name: String,
+    /** When the change was found, ISO. */
+    val at: String,
+    /** Dates of the two versions of the file, as the server sends them. */
+    val from: String? = null,
+    val to: String? = null,
+    val added: List<ChangedLesson> = emptyList(),
+    val removed: List<ChangedLesson> = emptyList(),
+    val changed: List<LessonChange> = emptyList(),
+    /** The card on the overview was opened or closed. */
+    val seen: Boolean = false,
+) {
+    val count get() = added.size + removed.size + changed.size
+}
+
+// The server's lesson key starts with the lesson's own date when Word prints one (shared/lessons.js).
+private val DATED = Regex("^\\d{4}-\\d{2}-\\d{2}\\|")
+
+/**
+ * The timetable's rows: the weekly Word rows, plus lessons printed with their own date. Dates
+ * computed from week marks are not compared one by one, or one changed mark would read as a
+ * dozen changes.
+ */
+fun rowsOf(t: Timetable): List<ChangedLesson> {
+    val weekly = t.weekly.flatMap { d -> d.lessons.map { ChangedLesson(d.day, null, it) } }
+    val dated = t.days
+        .flatMap { d -> d.lessons.filter { DATED.containsMatchIn(it.key) }.map { ChangedLesson(d.weekday, d.date, it) } }
+        .distinctBy { it.lesson.key }
+    return weekly + dated
+}
+
+private fun norm(s: String) = s.lowercase().replace(Regex("\\s+"), " ").trim()
+
+// Looser identity for pairing a lesson whose day, time or week mark changed.
+private fun looseKey(l: Lesson) = listOf(norm(l.subject), l.variant, l.subgroup.orEmpty(), norm(l.type)).joinToString("|")
+
+private fun whenLabel(row: ChangedLesson) =
+    row.date?.let { parseDate(it).let { d -> "${d.weekdayName()}, ${d.longLabel()}" } } ?: dayName(row.day)
+
+private fun fields(a: ChangedLesson, b: ChangedLesson): List<FieldChange> {
+    val shown = { s: String -> s.ifBlank { "не указано" } }
+    return listOfNotNull(
+        ("День" to (whenLabel(a) to whenLabel(b))),
+        ("Начало" to (a.lesson.start to b.lesson.start)),
+        ("Окончание" to (a.lesson.end.orEmpty() to b.lesson.end.orEmpty())),
+        ("Недели" to (a.lesson.condition to b.lesson.condition)),
+        ("Вид занятия" to (a.lesson.type to b.lesson.type)),
+        ("Преподаватель" to (a.lesson.teachers.joinToString(", ") to b.lesson.teachers.joinToString(", "))),
+        ("Аудитория" to (a.lesson.rooms.joinToString(", ") to b.lesson.rooms.joinToString(", "))),
+    ).filter { (_, values) -> values.first.trim() != values.second.trim() }
+        .map { (label, values) -> FieldChange(label, shown(values.first), shown(values.second)) }
+}
+
+/** Added, removed and changed rows between two versions of the group's timetable. */
+fun diffTimetables(before: Timetable, after: Timetable): Triple<List<ChangedLesson>, List<ChangedLesson>, List<LessonChange>> {
+    val old = rowsOf(before).groupByTo(LinkedHashMap()) { it.lesson.key }
+    val changed = mutableListOf<LessonChange>()
+    val unmatched = mutableListOf<ChangedLesson>()
+    for (row in rowsOf(after)) {
+        val was = old[row.lesson.key]?.removeFirstOrNull()
+        if (was == null) unmatched += row
+        else fields(was, row).takeIf { it.isNotEmpty() }?.let { changed += LessonChange(was, row, it) }
+    }
+    val left = old.values.flatten().toMutableList()
+    // Pair the rest by subject on the same day first, then by subject alone (moved to another day).
+    for (sameDay in listOf(true, false))
+        for (row in unmatched.toList()) {
+            val index = left.indexOfFirst {
+                looseKey(it.lesson) == looseKey(row.lesson) && (!sameDay || (it.date ?: it.day.toString()) == (row.date ?: row.day.toString()))
+            }
+            if (index < 0) continue
+            val was = left.removeAt(index)
+            unmatched.remove(row)
+            changed += LessonChange(was, row, fields(was, row))
+        }
+    val order = compareBy<ChangedLesson>({ it.date.orEmpty() }, { it.day }, { it.lesson.start })
+    return Triple(unmatched.sortedWith(order), left.sortedWith(order), changed.sortedWith(compareBy(order) { it.after }))
+}

android/app/src/main/kotlin/org/xtimms/psu/schedule/data/Repository.kt

@@ -22,6 +22,49 @@ class Repository(context: Context, val api: Api, private val settings: Settings)
     private val _exams = MutableStateFlow(readExams())
     val exams: StateFlow<ExamsResponse?> = _exams
 
+    // What changed when the university republished a document, per document and group.
+    private val changesCache = File(context.filesDir, "changes.json")
+    private val _changes = MutableStateFlow(readChanges())
+    val changes: StateFlow<List<ScheduleChanges>> = _changes
+
+    private fun readChanges(): List<ScheduleChanges> =
+        runCatching { json.decodeFromString<List<ScheduleChanges>>(changesCache.readText()) }.getOrDefault(emptyList())
+
+    private fun writeChanges(list: List<ScheduleChanges>) {
+        _changes.value = list
+        runCatching { changesCache.writeText(json.encodeToString(kotlinx.serialization.builtins.ListSerializer(ScheduleChanges.serializer()), list)) }
+    }
+
+    /**
+     * Compares a newer version of the same document with the copy on the device, as the PWA
+     * does: only a republished file counts, not a new parser or another document of the group.
+     */
+    private fun detectChanges(previous: Timetable?, fresh: Timetable) {
+        if (previous == null || previous.document.id != fresh.document.id || previous.group != fresh.group) return
+        val was = previous.document.modified ?: return
+        val now = fresh.document.modified ?: return
+        if (was == now) return
+        val (added, removed, changed) = diffTimetables(previous, fresh)
+        if (added.isEmpty() && removed.isEmpty() && changed.isEmpty()) return
+        val record = ScheduleChanges(
+            document = fresh.document.id,
+            group = fresh.group,
+            name = fresh.document.name,
+            at = java.time.Instant.now().toString(),
+            from = was,
+            to = now,
+            added = added,
+            removed = removed,
+            changed = changed,
+        )
+        writeChanges((listOf(record) + _changes.value.filter { it.document != record.document || it.group != record.group }).take(12))
+    }
+
+    /** The overview's card was opened or closed: the record stays for "Последние изменения". */
+    suspend fun markChangesSeen(record: ScheduleChanges) = withContext(Dispatchers.IO) {
+        writeChanges(_changes.value.map { if (it.document == record.document && it.group == record.group) it.copy(seen = true) else it })
+    }
+
     private fun readExams(): ExamsResponse? =
         runCatching { json.decodeFromString<ExamsResponse>(examsCache.readText()) }.getOrNull()
 
@@ -40,6 +83,8 @@ class Repository(context: Context, val api: Api, private val settings: Settings)
         attempt {
             val from = today().monday()
             val fresh = api.timetable(group.docId, group.group, from.toString(), span)
+            // Also when the background sync finds the new version: the card waits for the student.
+            detectChanges(_timetable.value, fresh)
             cache.writeText(json.encodeToString(Timetable.serializer(), fresh))
             _timetable.value = fresh
             // Exams come from the whole catalog index; their failure never fails the timetable.

android/app/src/main/kotlin/org/xtimms/psu/schedule/ui/Changes.kt

@@ -0,0 +1,185 @@
+package org.xtimms.psu.schedule.ui
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.rounded.ArrowForward
+import androidx.compose.material.icons.rounded.Close
+import androidx.compose.material.icons.rounded.Difference
+import androidx.compose.material3.Button
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.semantics.semantics
+import androidx.compose.ui.text.style.TextDecoration
+import androidx.compose.ui.unit.dp
+import org.xtimms.psu.schedule.data.ChangedLesson
+import org.xtimms.psu.schedule.data.LessonChange
+import org.xtimms.psu.schedule.data.MINSK
+import org.xtimms.psu.schedule.data.ScheduleChanges
+import org.xtimms.psu.schedule.data.dayName
+import org.xtimms.psu.schedule.data.longLabel
+import org.xtimms.psu.schedule.data.parseDate
+import org.xtimms.psu.schedule.data.plural
+import org.xtimms.psu.schedule.data.shortWeekday
+import org.xtimms.psu.schedule.ui.theme.card
+import java.time.Instant
+import java.time.ZonedDateTime
+import java.time.format.DateTimeFormatter
+
+/** "3 изменения". */
+fun changesLabel(n: Int) = "$n ${plural(n, "изменение", "изменения", "изменений")}"
+
+/** The date of a file version ("Mon, 19 Oct 2026 08:00:00 GMT") or of a check (ISO), in Minsk. */
+fun changeDate(value: String?): String? = value?.let {
+    runCatching { ZonedDateTime.parse(it, DateTimeFormatter.RFC_1123_DATE_TIME).toInstant() }
+        .recoverCatching { Instant.parse(value) }
+        .getOrNull()
+        ?.atZone(MINSK)?.toLocalDate()?.longLabel()
+}
+
+/**
+ * The overview's card after the university republished the group's document: how many lessons
+ * changed, "Показать" for the list, and a close button. Both mark the record as seen.
+ */
+@Composable
+fun ChangesCard(record: ScheduleChanges, onShow: () -> Unit, onClose: () -> Unit) {
+    Surface(
+        shape = MaterialTheme.shapes.extraLarge,
+        color = MaterialTheme.colorScheme.secondaryContainer,
+        contentColor = MaterialTheme.colorScheme.onSecondaryContainer,
+        modifier = Modifier.fillMaxWidth(),
+    ) {
+        Row(Modifier.padding(start = 20.dp, end = 8.dp, top = 16.dp, bottom = 16.dp), verticalAlignment = Alignment.Top) {
+            Surface(shape = CircleShape, color = MaterialTheme.colorScheme.secondary, modifier = Modifier.size(40.dp)) {
+                Icon(Icons.Rounded.Difference, contentDescription = null, modifier = Modifier.padding(8.dp))
+            }
+            Spacer(Modifier.width(16.dp))
+            Column(Modifier.weight(1f).semantics(mergeDescendants = true) {}, verticalArrangement = Arrangement.spacedBy(2.dp)) {
+                Text("Расписание обновлено · ${changesLabel(record.count)}", style = MaterialTheme.typography.titleSmallEmphasized)
+                Text(
+                    "Для ${record.group}" + (changeDate(record.to)?.let { " · файл от $it" } ?: ""),
+                    style = MaterialTheme.typography.bodyMedium,
+                )
+                Button(onClick = onShow, modifier = Modifier.padding(top = 8.dp)) { Text("Показать") }
+            }
+            IconButton(onClick = onClose, modifier = Modifier.align(Alignment.Top)) {
+                Icon(Icons.Rounded.Close, contentDescription = "Скрыть сообщение об изменениях")
+            }
+        }
+    }
+}
+
+/** The list behind the card: changed, added and removed lessons, as in the PWA. */
+@Composable
+fun ChangesSheet(record: ScheduleChanges) {
+    Column(
+        Modifier.verticalScroll(rememberScrollState()).padding(start = 24.dp, end = 24.dp, bottom = 32.dp),
+        verticalArrangement = Arrangement.spacedBy(12.dp),
+    ) {
+        Heading("Изменения в расписании", style = MaterialTheme.typography.headlineSmallEmphasized)
+        Text(
+            "${record.group} · ${record.name.replace(Regex("\\.docx?$", RegexOption.IGNORE_CASE), "")}" +
+                (changeDate(record.to)?.let { " · файл от $it" } ?: "") +
+                ". Сравнение с прошлой версией, сохранённой на этом устройстве.",
+            style = MaterialTheme.typography.bodyLarge,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+        if (record.changed.isNotEmpty()) {
+            Heading("Изменено · ${record.changed.size}", modifier = Modifier.padding(top = 8.dp))
+            record.changed.forEach { ChangedRow(it) }
+        }
+        if (record.added.isNotEmpty()) {
+            Heading("Добавлено · ${record.added.size}", modifier = Modifier.padding(top = 8.dp))
+            record.added.forEach { row ->
+                ChangeItem(row, details = listOf(row.lesson.type, row.lesson.teachers.joinToString(", "), row.lesson.rooms.joinToString(", ") { "ауд. $it" }, row.lesson.condition))
+            }
+        }
+        if (record.removed.isNotEmpty()) {
+            Heading("Удалено · ${record.removed.size}", modifier = Modifier.padding(top = 8.dp))
+            record.removed.forEach { row -> ChangeItem(row, removed = true, details = listOf(row.lesson.type, row.lesson.condition)) }
+        }
+        Text(
+            "Сверяйтесь с документом Word: при сомнениях он главнее.",
+            style = MaterialTheme.typography.bodyMedium,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.padding(top = 8.dp),
+        )
+    }
+}
+
+private fun whenText(row: ChangedLesson) =
+    (row.date?.let { parseDate(it).let { d -> "${d.shortWeekday()}, ${d.longLabel()}" } } ?: dayName(row.day)) + " · " + row.lesson.start
+
+@Composable
+private fun ChangedRow(change: LessonChange) {
+    Surface(shape = MaterialTheme.shapes.large, color = MaterialTheme.colorScheme.card, modifier = Modifier.fillMaxWidth()) {
+        Column(Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(4.dp)) {
+            Text(whenText(change.after), style = MaterialTheme.typography.labelLarge, color = MaterialTheme.colorScheme.primary)
+            Text(change.after.lesson.subject, style = MaterialTheme.typography.titleMediumEmphasized)
+            change.fields.forEach { f ->
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Text("${f.label}: ", style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
+                    Text(
+                        f.from,
+                        style = MaterialTheme.typography.bodyMedium.copy(textDecoration = TextDecoration.LineThrough),
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        modifier = Modifier.weight(1f, fill = false),
+                    )
+                    Icon(
+                        Icons.AutoMirrored.Rounded.ArrowForward,
+                        contentDescription = "на",
+                        modifier = Modifier.padding(horizontal = 6.dp).size(16.dp),
+                    )
+                    Text(f.to, style = MaterialTheme.typography.bodyMedium, modifier = Modifier.weight(1f, fill = false))
+                }
+            }
+            if (change.fields.isEmpty()) Text(
+                "Изменился текст ячейки Word",
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+            )
+        }
+    }
+}
+
+@Composable
+private fun ChangeItem(row: ChangedLesson, details: List<String>, removed: Boolean = false) {
+    Surface(
+        shape = MaterialTheme.shapes.large,
+        color = if (removed) MaterialTheme.colorScheme.surfaceContainer else MaterialTheme.colorScheme.card,
+        modifier = Modifier.fillMaxWidth(),
+    ) {
+        Column(Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(4.dp)) {
+            Text(
+                whenText(row),
+                style = MaterialTheme.typography.labelLarge,
+                color = if (removed) MaterialTheme.colorScheme.onSurfaceVariant else MaterialTheme.colorScheme.primary,
+            )
+            Text(
+                row.lesson.subject,
+                style = MaterialTheme.typography.titleMediumEmphasized.let {
+                    if (removed) it.copy(textDecoration = TextDecoration.LineThrough) else it
+                },
+                color = if (removed) MaterialTheme.colorScheme.onSurfaceVariant else MaterialTheme.colorScheme.onSurface,
+            )
+            details.filter { it.isNotBlank() }.joinToString(" · ").takeIf { it.isNotEmpty() }?.let {
+                Text(it, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.onSurfaceVariant)
+            }
+        }
+    }
+}

android/app/src/main/kotlin/org/xtimms/psu/schedule/ui/HomeScreen.kt

@@ -131,6 +131,8 @@ fun HomeScreen(vm: MainViewModel, nav: AppNav) {
     var details by remember { mutableStateOf<Pair<Lesson, LocalDate>?>(null) }
     var editing by remember { mutableStateOf<Note?>(null) }
     var session by remember { mutableStateOf(false) }
+    val changes by vm.changes.collectAsStateWithLifecycle()
+    var changesOpen by remember { mutableStateOf(false) }
     val subgroup = settings?.subgroup
     val clock = rememberClock()
     val date = today()
@@ -209,6 +211,18 @@ fun HomeScreen(vm: MainViewModel, nav: AppNav) {
                     // Cards that appear, empty out or grow (attendance once marked, plans as they
                     // are ticked off) ease the rest of the overview into place.
                     if (!twoPane) item(key = "actions") { QuickActions(nav, Modifier.bleed(16.dp)) }
+                    // The university republished the document: what changed for the group, until seen.
+                    changes?.takeIf { !it.seen }?.let { record ->
+                        item(key = "changes") {
+                            AnimatedItem {
+                                ChangesCard(
+                                    record,
+                                    onShow = { changesOpen = true; vm.markChangesSeen(record) },
+                                    onClose = { vm.markChangesSeen(record) },
+                                )
+                            }
+                        }
+                    }
                     item(key = "week") { AnimatedItem { WeekReport(vm, t, subgroup, date, clock) } }
                     item(key = "session") { AnimatedItem { SessionCard(vm, t, onOpen = { session = true }) } }
                     item(key = "today-title") { AnimatedItem { DayTitle("Сегодня", date) } }
@@ -237,6 +251,9 @@ fun HomeScreen(vm: MainViewModel, nav: AppNav) {
             }
         }
     }
+    if (changesOpen) changes?.let { record ->
+        ModalBottomSheet(onDismissRequest = { changesOpen = false }) { ChangesSheet(record) }
+    }
     if (session) timetable?.let { t ->
         val exams = upcomingExams(vm, t)
         ModalBottomSheet(onDismissRequest = { session = false }) { SessionSheet(exams) }

android/app/src/main/kotlin/org/xtimms/psu/schedule/ui/MainViewModel.kt

@@ -39,6 +39,16 @@ class MainViewModel(application: Application) : AndroidViewModel(application) {
     /** The open group's exams; null until the first answer, then cached on the device. */
     val exams: StateFlow<org.xtimms.psu.schedule.data.ExamsResponse?> = app.repository.exams
 
+    /** What changed in the open group's document when the university last republished it. */
+    val changes: StateFlow<org.xtimms.psu.schedule.data.ScheduleChanges?> =
+        combine(app.repository.changes, app.repository.timetable) { list, t ->
+            t?.let { list.firstOrNull { it.document == t.document.id && it.group == t.group } }
+        }.stateIn(viewModelScope, SharingStarted.Eagerly, null)
+
+    fun markChangesSeen(record: org.xtimms.psu.schedule.data.ScheduleChanges) = viewModelScope.launch {
+        if (!record.seen) repository.markChangesSeen(record)
+    }
+
     /** Tasks and notes of the open group. */
     val notes: StateFlow<List<Note>> = combine(app.notes.notes, app.settings.flow) { list, s ->
         val key = s.current?.let(::groupKey)

android/app/src/main/kotlin/org/xtimms/psu/schedule/ui/SettingsScreen.kt

@@ -33,6 +33,9 @@ import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.setValue
+import androidx.compose.foundation.clickable
+import androidx.compose.material.icons.automirrored.rounded.KeyboardArrowRight
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
@@ -47,6 +50,8 @@ import org.xtimms.psu.schedule.notify.Reminders
 fun SettingsScreen(vm: MainViewModel, onBack: () -> Unit) {
     val settings by vm.settings.collectAsStateWithLifecycle()
     val timetable by vm.timetable.collectAsStateWithLifecycle()
+    val changes by vm.changes.collectAsStateWithLifecycle()
+    var changesOpen by androidx.compose.runtime.remember { androidx.compose.runtime.mutableStateOf(false) }
     val s = settings ?: return
     val context = LocalContext.current
     val permission = rememberLauncherForActivityResult(ActivityResultContracts.RequestPermission()) { granted ->
@@ -155,6 +160,24 @@ fun SettingsScreen(vm: MainViewModel, onBack: () -> Unit) {
                 val doc = timetable?.document
                 Info("Документ", doc?.name ?: "Группа не выбрана")
                 timetable?.semester?.let { Info("Семестр", it.label) }
+                changes?.let { record ->
+                    // The last republication of the document, also after its card was closed.
+                    Row(
+                        verticalAlignment = Alignment.CenterVertically,
+                        modifier = Modifier.fillMaxWidth().clip(MaterialTheme.shapes.medium)
+                            .clickable(onClickLabel = "Показать изменения") { changesOpen = true },
+                    ) {
+                        Column(Modifier.weight(1f)) {
+                            Text("Последние изменения", style = MaterialTheme.typography.bodyLarge)
+                            Text(
+                                changesLabel(record.count) + (changeDate(record.at)?.let { " · найдены $it" } ?: ""),
+                                style = MaterialTheme.typography.bodyMedium,
+                                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                            )
+                        }
+                        Icon(Icons.AutoMirrored.Rounded.KeyboardArrowRight, contentDescription = null)
+                    }
+                }
                 Info("Сервер", BuildConfig.API_URL)
                 Text(
                     "Расписание берётся из публичного каталога ПГУ и пересчитывается по таблице белых и зелёных недель. " +
@@ -166,6 +189,9 @@ fun SettingsScreen(vm: MainViewModel, onBack: () -> Unit) {
         }
         }
     }
+    if (changesOpen) changes?.let { record ->
+        androidx.compose.material3.ModalBottomSheet(onDismissRequest = { changesOpen = false }) { ChangesSheet(record) }
+    }
 }
 
 @Composable