feat(tasks): вложенные задачи (подзадачи) + per-task меню «⋯»

Паритет веб-версии Задач:
- CalDAV: RELATED-TO;RELTYPE=PARENT в модели/парсере/билдере VTODO
  (DavTask.parentUid); createTask принимает parentUid; updateTask и
  toggleComplete сохраняют связь с родителем.
- TasksRepository/VM: createSubtask(parent), deleteTask(task) для любой
  задачи (не только открытой детали).
- UI: у задачи меню «⋯» → «Добавить вложенную задачу» / «Удалить задачу»;
  подзадачи рисуются под родителем с отступом 24dp; диалог ввода названия
  подзадачи. Подзадачи исключены из верхнего уровня (не дублируются).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

core/network/src/main/java/ru/forbion/f7cloud/core/network/CalDavClient.kt

@@ -75,6 +75,8 @@ data class DavTask(
     val description: String,
     val calendarName: String,
     val calendarHref: String,
+    /** UID родительской задачи (RELATED-TO;RELTYPE=PARENT) — для подзадач; пусто у корневых. */
+    val parentUid: String = "",
 ) {
     val isCompleted: Boolean
         get() = status.equals("COMPLETED", ignoreCase = true) || percentComplete >= 100
@@ -87,6 +89,11 @@ object CalDavClient {
     private val icsDue = Pattern.compile("DUE[^:]*:([^\\r\\n]+)", Pattern.CASE_INSENSITIVE)
     private val icsStatus = Pattern.compile("STATUS:([^\\r\\n]+)", Pattern.CASE_INSENSITIVE)
     private val icsUid = Pattern.compile("UID:([^\\r\\n]+)", Pattern.CASE_INSENSITIVE)
+    // RELATED-TO с необязательным RELTYPE=PARENT (или без параметров) → UID родителя.
+    private val icsRelatedTo = Pattern.compile(
+        "RELATED-TO(?:;[^:\\r\\n]*)?:([^\\r\\n]+)",
+        Pattern.CASE_INSENSITIVE,
+    )
     private val icsDtStamp = Pattern.compile("DTSTAMP[^:]*:([^\\r\\n]+)", Pattern.CASE_INSENSITIVE)
     private val icsLastModified = Pattern.compile("LAST-MODIFIED[^:]*:([^\\r\\n]+)", Pattern.CASE_INSENSITIVE)
     private val icsPriority = Pattern.compile("PRIORITY:([^\\r\\n]+)", Pattern.CASE_INSENSITIVE)
@@ -634,6 +641,7 @@ object CalDavClient {
         dueDate: LocalDate? = null,
         priority: Int = 0,
         description: String = "",
+        parentUid: String = "",
     ): DavTask {
         val uid = "${UUID.randomUUID()}@f7cloud.mobile"
         val ics = buildVTodoIcs(
@@ -644,6 +652,7 @@ object CalDavClient {
             priority = priority,
             percentComplete = 0,
             description = description,
+            parentUid = parentUid,
         )
         val url = calendar.href.trimEnd('/') + "/$uid.ics"
         val req = Request.Builder()
@@ -670,6 +679,7 @@ object CalDavClient {
             description = description,
             calendarName = calendar.displayName,
             calendarHref = calendar.href,
+            parentUid = parentUid,
         )
     }
 
@@ -691,6 +701,7 @@ object CalDavClient {
             priority = priority,
             percentComplete = percentComplete,
             description = description,
+            parentUid = task.parentUid, // не терять связь с родителем при правке подзадачи
         )
         val req = Request.Builder()
             .url(task.href)
@@ -938,6 +949,7 @@ object CalDavClient {
             description = extractIcs(icsDescription, ics),
             calendarName = calendarName,
             calendarHref = calendarHref,
+            parentUid = extractIcs(icsRelatedTo, ics).trim(),
         )
     }
 
@@ -949,6 +961,7 @@ object CalDavClient {
         priority: Int,
         percentComplete: Int,
         description: String,
+        parentUid: String = "",
     ): String {
         val now = Instant.now()
         return buildString {
@@ -976,6 +989,9 @@ object CalDavClient {
             if (description.isNotBlank()) {
                 appendLine("DESCRIPTION:${escapeIcsText(description)}")
             }
+            if (parentUid.isNotBlank()) {
+                appendLine("RELATED-TO;RELTYPE=PARENT:${escapeIcsText(parentUid)}")
+            }
             appendLine("END:VTODO")
             appendLine("END:VCALENDAR")
         }

feature/tasks/src/main/java/ru/forbion/f7cloud/feature/tasks/TasksComponents.kt

@@ -4,6 +4,7 @@ import androidx.compose.animation.animateContentSize
 import androidx.compose.foundation.background
 import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -345,7 +346,10 @@ fun TasksRow(
     onToggleComplete: () -> Unit,
     onOpen: () -> Unit,
     modifier: Modifier = Modifier,
+    onAddSubtask: (() -> Unit)? = null,
+    onDelete: (() -> Unit)? = null,
 ) {
+    var menuOpen by remember { mutableStateOf(false) }
     val hasMeta = showMeta && (task.listName.isNotBlank() || task.percentComplete in 1..99 || task.due.isNotBlank())
     Column(
         modifier = modifier
@@ -401,6 +405,43 @@ fun TasksRow(
                         color = task.dueDateColor(),
                     )
                 }
+                // Меню «⋯»: вложенная задача / удалить (как в веб-версии)
+                if (onAddSubtask != null || onDelete != null) {
+                    Box {
+                        Text(
+                            "⋯",
+                            fontSize = 20.sp,
+                            fontWeight = FontWeight.Bold,
+                            color = F7Colors.TextSecondary,
+                            modifier = Modifier
+                                .size(24.dp)
+                                .clickable(
+                                    interactionSource = remember { MutableInteractionSource() },
+                                    indication = null,
+                                    onClick = { menuOpen = true },
+                                ),
+                            textAlign = androidx.compose.ui.text.style.TextAlign.Center,
+                        )
+                        androidx.compose.material3.DropdownMenu(
+                            expanded = menuOpen,
+                            onDismissRequest = { menuOpen = false },
+                            containerColor = androidx.compose.ui.graphics.Color.White,
+                        ) {
+                            onAddSubtask?.let { add ->
+                                androidx.compose.material3.DropdownMenuItem(
+                                    text = { Text("Добавить вложенную задачу", color = F7Colors.TextPrimary) },
+                                    onClick = { menuOpen = false; add() },
+                                )
+                            }
+                            onDelete?.let { del ->
+                                androidx.compose.material3.DropdownMenuItem(
+                                    text = { Text("Удалить задачу", color = F7Colors.Error) },
+                                    onClick = { menuOpen = false; del() },
+                                )
+                            }
+                        }
+                    }
+                }
             }
         }
         if (hasMeta) {
@@ -1064,3 +1105,42 @@ private fun SmartListSettingRow(
         }
     }
 }
+
+/** Диалог создания вложенной задачи (подзадачи) — по кнопке «Добавить вложенную задачу». */
+@Composable
+fun TaskSubtaskDialog(
+    parentTitle: String,
+    onConfirm: (String) -> Unit,
+    onDismiss: () -> Unit,
+) {
+    var text by remember { mutableStateOf("") }
+    Dialog(onDismissRequest = onDismiss) {
+        Surface(shape = RoundedCornerShape(16.dp), color = Color.White) {
+            Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(12.dp)) {
+                Text(
+                    "Вложенная задача",
+                    style = MaterialTheme.typography.titleMedium.copy(fontSize = 18.sp),
+                    fontWeight = FontWeight.SemiBold,
+                    color = F7Colors.TextPrimary,
+                )
+                Text(
+                    "к «$parentTitle»",
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = F7Colors.TextSecondary,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                )
+                F7OutlinedField(value = text, onValueChange = { text = it }, label = "Название")
+                Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                    F7SecondaryButton("Отмена", onClick = onDismiss, modifier = Modifier.weight(1f))
+                    F7PrimaryButton(
+                        text = "Создать",
+                        onClick = { onConfirm(text.trim()) },
+                        enabled = text.isNotBlank(),
+                        modifier = Modifier.weight(1f),
+                    )
+                }
+            }
+        }
+    }
+}

feature/tasks/src/main/java/ru/forbion/f7cloud/feature/tasks/TasksRepository.kt

@@ -29,6 +29,7 @@ data class TaskItem(
     val description: String,
     val listHref: String,
     val listName: String,
+    val parentUid: String = "",
 ) {
     val isCompleted: Boolean
         get() = status.equals("COMPLETED", ignoreCase = true) || percentComplete >= 100
@@ -46,6 +47,7 @@ data class TaskItem(
         description = description,
         calendarName = listName,
         calendarHref = listHref,
+        parentUid = parentUid,
     )
 }
 
@@ -80,6 +82,7 @@ class TasksRepository {
         dueDate: LocalDate? = null,
         priority: Int = 0,
         description: String = "",
+        parentUid: String = "",
     ): TaskItem {
         val client = authedClient(session)
         val calendar = calendarForHref(session, listHref)
@@ -90,6 +93,7 @@ class TasksRepository {
             dueDate = dueDate,
             priority = priority,
             description = description,
+            parentUid = parentUid,
         ).toTaskItem()
     }
 
@@ -157,6 +161,7 @@ class TasksRepository {
         description = description,
         listHref = calendarHref,
         listName = calendarName,
+        parentUid = parentUid,
     )
 
     private fun calendarSlug(href: String): String {

feature/tasks/src/main/java/ru/forbion/f7cloud/feature/tasks/TasksScreen.kt

@@ -17,6 +17,9 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.unit.dp
@@ -37,6 +40,8 @@ fun TasksScreen(
 ) {
     val vm: TasksViewModel = viewModel()
     val state by vm.state.collectAsState()
+    // Родитель для создаваемой подзадачи (открывает диалог ввода названия).
+    var subtaskParent by remember { mutableStateOf<TaskItem?>(null) }
 
     // Стрелка «назад» нижней панели на Задачах → показать панель списков (закрыть открытый список).
     LaunchedEffect(showListsRequest) {
@@ -109,6 +114,8 @@ fun TasksScreen(
                     onReload = { vm.refreshTasks(session) },
                     onToggleCompletedExpanded = vm::toggleCompletedExpanded,
                     onDeleteCompleted = { vm.deleteCompletedTasks(session) },
+                    onAddSubtask = { subtaskParent = it },
+                    onDeleteTask = { vm.deleteTask(session, it) },
                 )
             }
         }
@@ -149,6 +156,18 @@ fun TasksScreen(
         onDismiss = vm::closeSettings,
         onSwipeBack = vm::closeSettings,
     )
+
+    // Диалог «Добавить вложенную задачу»
+    subtaskParent?.let { parent ->
+        TaskSubtaskDialog(
+            parentTitle = parent.summary,
+            onConfirm = { title ->
+                vm.createSubtask(session, parent, title)
+                subtaskParent = null
+            },
+            onDismiss = { subtaskParent = null },
+        )
+    }
 }
 
 @OptIn(ExperimentalMaterial3Api::class)
@@ -168,7 +187,15 @@ private fun TasksMainContent(
     onReload: () -> Unit,
     onToggleCompletedExpanded: () -> Unit,
     onDeleteCompleted: () -> Unit,
+    onAddSubtask: (TaskItem) -> Unit,
+    onDeleteTask: (TaskItem) -> Unit,
 ) {
+    // Подзадачи (RELATED-TO) — рисуем под родителем с отступом; из верхнего уровня исключаем.
+    val childrenByParent = remember(state.visibleActiveGroups) {
+        state.visibleActiveGroups.flatMap { it.tasks }
+            .filter { it.parentUid.isNotBlank() }
+            .groupBy { it.parentUid }
+    }
     Column(modifier = Modifier.fillMaxSize()) {
         TasksToolbar(
             serverUrl = session.serverUrl,
@@ -218,13 +245,27 @@ private fun TasksMainContent(
                             modifier = Modifier.padding(bottom = 4.dp),
                         )
                     }
-                    items(group.tasks, key = { it.uid }) { task ->
+                    items(group.tasks.filter { it.parentUid.isBlank() }, key = { it.uid }) { task ->
-                        TasksRow(
+                        Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
-                            task = task,
+                            TasksRow(
-                            serverUrl = session.serverUrl,
+                                task = task,
-                            onToggleComplete = { onToggleComplete(task) },
+                                serverUrl = session.serverUrl,
-                            onOpen = { onOpenTask(task) },
+                                onToggleComplete = { onToggleComplete(task) },
-                        )
+                                onOpen = { onOpenTask(task) },
+                                onAddSubtask = { onAddSubtask(task) },
+                                onDelete = { onDeleteTask(task) },
+                            )
+                            childrenByParent[task.uid].orEmpty().forEach { sub ->
+                                TasksRow(
+                                    task = sub,
+                                    serverUrl = session.serverUrl,
+                                    onToggleComplete = { onToggleComplete(sub) },
+                                    onOpen = { onOpenTask(sub) },
+                                    onDelete = { onDeleteTask(sub) },
+                                    modifier = Modifier.padding(start = 24.dp),
+                                )
+                            }
+                        }
                     }
                 }
 

feature/tasks/src/main/java/ru/forbion/f7cloud/feature/tasks/TasksViewModel.kt

@@ -197,6 +197,7 @@ class TasksViewModel(
         summary: String,
         dueInput: String,
         priority: Int,
+        parentUid: String = "",
     ) {
         val listHref = _state.value.selectedListHref ?: return
         if (summary.isBlank()) {
@@ -218,6 +219,7 @@ class TasksViewModel(
                     summary = summary.trim(),
                     dueDate = dueDate,
                     priority = priority,
+                    parentUid = parentUid,
                 )
             }.onSuccess {
                 _state.update {
@@ -301,6 +303,30 @@ class TasksViewModel(
         }
     }
 
+    /** Удаление конкретной задачи из списка (per-task меню «⋯»), не только открытой детали. */
+    fun deleteTask(session: AuthSession, task: TaskItem) {
+        viewModelScope.launch(Dispatchers.IO) {
+            _state.update { it.copy(saving = true, error = null) }
+            runCatching { repository.deleteTask(session, task) }
+                .onSuccess {
+                    _state.update {
+                        it.copy(saving = false, detailTask = it.detailTask?.takeIf { d -> d.uid != task.uid })
+                    }
+                    _state.value.selectedListHref?.let { loadTasks(session, it) }
+                }
+                .onFailure { t ->
+                    _state.update {
+                        it.copy(saving = false, error = t.message ?: "Не удалось удалить", unauthorized = t is UnauthorizedException)
+                    }
+                }
+        }
+    }
+
+    /** Создать подзадачу к [parent] с заголовком [summary]. */
+    fun createSubtask(session: AuthSession, parent: TaskItem, summary: String) {
+        createTask(session, summary, "", 0, parentUid = parent.uid)
+    }
+
     fun deleteDetail(session: AuthSession) {
         val task = _state.value.detailTask ?: return
         viewModelScope.launch(Dispatchers.IO) {