feat: 支持动态显示已完成待办

只是完成功能，后续会根据用户自定设置来动态显示

app/src/main/kotlin/cn/super12138/todo/ui/pages/main/MainPage.kt

@@ -1,9 +1,7 @@
 package cn.super12138.todo.ui.pages.main
 
 import androidx.activity.compose.BackHandler
-import androidx.compose.animation.AnimatedContent
 import androidx.compose.animation.AnimatedVisibility
-import androidx.compose.animation.animateColorAsState
 import androidx.compose.animation.expandIn
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
@@ -13,19 +11,8 @@ import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.rememberLazyListState
-import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.outlined.Close
-import androidx.compose.material.icons.outlined.Delete
-import androidx.compose.material.icons.outlined.SelectAll
-import androidx.compose.material.icons.outlined.Settings
 import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.Icon
-import androidx.compose.material3.IconButton
-import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
-import androidx.compose.material3.Text
-import androidx.compose.material3.TopAppBar
-import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.material3.adaptive.currentWindowAdaptiveInfo
 import androidx.compose.material3.rememberModalBottomSheetState
 import androidx.compose.runtime.Composable
@@ -38,9 +25,7 @@ import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.res.stringResource
 import androidx.window.core.layout.WindowWidthSizeClass
-import cn.super12138.todo.R
 import cn.super12138.todo.logic.database.TodoEntity
 import cn.super12138.todo.ui.pages.main.components.TodoFAB
 import cn.super12138.todo.ui.pages.main.components.TodoTopAppBar
@@ -72,6 +57,10 @@ fun MainPage(viewModel: MainViewModel, modifier: Modifier = Modifier) {
         }
     }
 
+    val showCompleted = true // 后续替换成用户设置
+    val filteredTodoList =
+        if (showCompleted) toDoList.value else toDoList.value.filter { item -> !item.isCompleted }
+
     BackHandler(enabled = !isSelectedIdsEmpty) {
         // 当按下返回键（或进行返回操作）时清空选择
         viewModel.clearAllTodoSelection()
@@ -114,7 +103,7 @@ fun MainPage(viewModel: MainViewModel, modifier: Modifier = Modifier) {
 
                 ManagerFragment(
                     state = listState,
-                    list = toDoList.value.filter { item -> !item.isCompleted },
+                    list = filteredTodoList,
                     onItemClick = { item ->
                         if (isSelectedIdsEmpty) {
                             openBottomSheet = true
@@ -154,10 +143,9 @@ fun MainPage(viewModel: MainViewModel, modifier: Modifier = Modifier) {
                         .weight(2f)
                         .fillMaxSize()
                 )
-
                 ManagerFragment(
                     state = listState,
-                    list = toDoList.value.filter { item -> !item.isCompleted },
+                    list = filteredTodoList,
                     onItemClick = { item ->
                         if (isSelectedIdsEmpty) {
                             openBottomSheet = true

app/src/main/kotlin/cn/super12138/todo/ui/pages/main/ManagerFragment.kt

@@ -68,6 +68,7 @@ fun ManagerFragment(
                     TodoCard(
                         content = item.content,
                         subject = Subjects.fromId(item.subject).getDisplayName(context),
+                        completed = item.isCompleted,
                         onCardClick = { onItemClick(item) },
                         onCardLongClick = { onItemLongClick(item) },
                         onChecked = { onItemChecked(item) },

app/src/main/kotlin/cn/super12138/todo/ui/pages/main/components/TodoCard.kt

@@ -26,6 +26,7 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextDecoration
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import cn.super12138.todo.R
@@ -35,6 +36,7 @@ import cn.super12138.todo.R
 fun TodoCard(
     content: String,
     subject: String,
+    completed: Boolean,
     onCardClick: () -> Unit = {},
     onCardLongClick: () -> Unit = {},
     onChecked: () -> Unit = {},
@@ -82,16 +84,18 @@ fun TodoCard(
                     style = MaterialTheme.typography.titleLarge,
                     maxLines = 1,
                     overflow = TextOverflow.Ellipsis,
+                    textDecoration = if (completed) TextDecoration.LineThrough else TextDecoration.None,
                     modifier = Modifier.basicMarquee() // TODO: 后续评估性能影响
                 )
                 Text(
                     text = subject,
                     style = MaterialTheme.typography.labelMedium,
+                    textDecoration = if (completed) TextDecoration.LineThrough else TextDecoration.None,
                     maxLines = 1
                 )
             }
 
-            AnimatedVisibility(!selected) {
+            AnimatedVisibility(!selected && !completed) {
                 IconButton(onClick = onChecked) {
                     Icon(
                         imageVector = Icons.Outlined.Check,