refactor: 删除无用代码，优化资源

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

@@ -212,7 +212,6 @@ fun MainPage(viewModel: MainViewModel, modifier: Modifier = Modifier) {
                 showDeleteConfirmDialog = false
                 viewModel.apply {
                     deleteSelectedTodo()
-                    clearAllTodoSelection()
                 }
             },
             onDismiss = { showDeleteConfirmDialog = false },

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

@@ -56,7 +56,7 @@ fun ProgressFragment(
                     )
                 )
                 Text(
-                    text = "/",
+                    text = stringResource(R.string.placeholder_divider),
                     style = MaterialTheme.typography.displayMedium.copy(
                         fontWeight = FontWeight.Bold
                     )

app/src/main/res/values/strings.xml

@@ -31,4 +31,5 @@
     <string name="action_confirm">Confirm</string>
     <string name="title_warning">Warning</string>
     <string name="tip_delete_task">You are about to delete the %s selected tasks. Once deleted, these tasks cannot be recovered. Are you sure you want to delete them?</string>
+    <string name="placeholder_divider" translatable="false">/</string>
 </resources>