fix: 修复回忆录序号问题；隐藏图片提示词，增加缩放和保存功能

app-android/app/src/main/java/com/huaga/life_echo/ui/components/memoir/ChapterCard.kt

@@ -36,24 +36,30 @@ import com.huaga.life_echo.utils.TextUtils
  * - 空章节：显示柔和的提示，引导用户去聊天
  * - 有内容章节：显示标题、状态、页数
  */
+/**
+ * @param displayIndex 展示用的章节序号（从 1 开始）。传入时按列表位置动态显示，不传则按 order_index 推算（兼容旧逻辑）。
+ */
 @Composable
 fun ChapterCard(
     chapter: ChapterDto,
     isEmpty: Boolean = false,
     onClick: () -> Unit,
     onGoChat: (() -> Unit)? = null,
+    displayIndex: Int? = null,
     modifier: Modifier = Modifier
 ) {
     if (isEmpty) {
         EmptyChapterCard(
             chapter = chapter,
             onGoChat = onGoChat,
+            displayIndex = displayIndex,
             modifier = modifier
         )
     } else {
         FilledChapterCard(
             chapter = chapter,
             onClick = onClick,
+            displayIndex = displayIndex,
             modifier = modifier
         )
     }
@@ -66,11 +72,12 @@ fun ChapterCard(
 private fun FilledChapterCard(
     chapter: ChapterDto,
     onClick: () -> Unit,
+    displayIndex: Int? = null,
     modifier: Modifier = Modifier
 ) {
     var isExpanded by remember { mutableStateOf(false) }
     
-    val chapterDisplayIndex = chapterOrderToDisplayIndex(chapter.order_index)
+    val chapterDisplayIndex = displayIndex ?: chapterOrderToDisplayIndex(chapter.order_index)
     
     val statusText = when (chapter.status) {
         "completed" -> "已整理 · 约${estimatePageCount(chapter.content)}页"
@@ -214,9 +221,10 @@ private fun FilledChapterCard(
 private fun EmptyChapterCard(
     chapter: ChapterDto,
     onGoChat: (() -> Unit)? = null,
+    displayIndex: Int? = null,
     modifier: Modifier = Modifier
 ) {
-    val chapterDisplayIndex = chapterOrderToDisplayIndex(chapter.order_index)
+    val chapterDisplayIndex = displayIndex ?: chapterOrderToDisplayIndex(chapter.order_index)
 
     Card(
         modifier = modifier.fillMaxWidth(),

app-android/app/src/main/java/com/huaga/life_echo/ui/components/memoir/ChapterReadingView.kt

@@ -20,9 +20,13 @@ import com.huaga.life_echo.ui.theme.AppTypography
 import com.huaga.life_echo.ui.theme.LightPurple
 import com.huaga.life_echo.utils.TextUtils
 
+/**
+ * @param displayIndex 展示用的章节序号（从 1 开始）。传入时与列表/全文阅读一致；不传则按 orderIndex 推算。
+ */
 @Composable
 fun ChapterReadingView(
     chapter: ChapterContentDto,
+    displayIndex: Int? = null,
     modifier: Modifier = Modifier
 ) {
     val blocks = remember(chapter.content, chapter.images) {
@@ -38,13 +42,15 @@ fun ChapterReadingView(
         )
     }
 
+    val chapterDisplayNum = displayIndex ?: chapterOrderToDisplayIndex(chapter.orderIndex)
+
     LazyColumn(
         modifier = modifier.fillMaxSize(),
         contentPadding = PaddingValues(horizontal = 16.dp, vertical = 16.dp)
     ) {
         item {
             Text(
-                text = "第${chapterOrderToDisplayIndex(chapter.orderIndex)}章",
+                text = "第${chapterDisplayNum}章",
                 fontSize = AppTypography.bodyMedium,
                 color = LightPurple,
                 modifier = Modifier.padding(bottom = 4.dp)

app-android/app/src/main/java/com/huaga/life_echo/ui/components/memoir/FullTextReadingView.kt

@@ -54,7 +54,7 @@ fun FullTextReadingView(
                     }
 
                     Text(
-                        text = "第${chapterOrderToDisplayIndex(chapter.orderIndex)}章",
+                        text = "第${index + 1}章",
                         fontSize = AppTypography.bodyMedium,
                         color = LightPurple,
                         fontWeight = FontWeight.Medium,

app-android/app/src/main/java/com/huaga/life_echo/ui/components/memoir/MemoirImageViewerDialog.kt

@@ -1,28 +1,56 @@
 package com.huaga.life_echo.ui.components.memoir
 
+import android.content.ContentValues
+import android.content.Context
+import android.os.Build
+import android.provider.MediaStore
+import android.widget.Toast
 import androidx.compose.foundation.background
-import androidx.compose.foundation.clickable
+import androidx.compose.foundation.gestures.detectTransformGestures
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
-import androidx.compose.material3.Text
+import androidx.compose.foundation.layout.size
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Close
+import androidx.compose.material.icons.filled.Download
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.graphicsLayer
+import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.window.Dialog
 import androidx.compose.ui.window.DialogProperties
 import coil.compose.AsyncImage
 import com.huaga.life_echo.network.models.ChapterImageDto
-import com.huaga.life_echo.ui.theme.AppTypography
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import java.net.URL
 
 @Composable
 fun MemoirImageViewerDialog(
     image: ChapterImageDto,
     onDismiss: () -> Unit,
 ) {
+    val context = LocalContext.current
+    val scope = rememberCoroutineScope()
+    var scale by remember { mutableFloatStateOf(1f) }
+    var offset by remember { mutableStateOf(Offset.Zero) }
+
     Dialog(
         onDismissRequest = onDismiss,
         properties = DialogProperties(usePlatformDefaultWidth = false),
@@ -30,28 +58,125 @@ fun MemoirImageViewerDialog(
         Box(
             modifier = Modifier
                 .fillMaxSize()
-                .background(Color.Black.copy(alpha = 0.9f))
+                .background(Color.Black.copy(alpha = 0.9f)),
-                .clickable(onClick = onDismiss),
-            contentAlignment = Alignment.Center,
         ) {
-            AsyncImage(
+            Box(
-                model = image.url,
+                modifier = Modifier.fillMaxSize(),
-                contentDescription = image.description,
+                contentAlignment = Alignment.Center,
-                contentScale = ContentScale.Fit,
+            ) {
+                Box(
+                    modifier = Modifier
+                        .fillMaxSize()
+                        .graphicsLayer(
+                            scaleX = scale,
+                            scaleY = scale,
+                            translationX = offset.x,
+                            translationY = offset.y,
+                        )
+                        .pointerInput(Unit) {
+                            detectTransformGestures { _, pan, zoom, _ ->
+                                scale = (scale * zoom).coerceIn(1f, 5f)
+                                if (scale > 1f) {
+                                    offset += pan
+                                } else {
+                                    offset = Offset.Zero
+                                }
+                            }
+                        },
+                    contentAlignment = Alignment.Center,
+                ) {
+                    AsyncImage(
+                        model = image.url,
+                        contentDescription = null,
+                        contentScale = ContentScale.Fit,
+                        modifier = Modifier
+                            .fillMaxSize()
+                            .padding(16.dp),
+                    )
+                }
+            }
+
+            // 顶部栏：关闭 + 保存
+            Box(
                 modifier = Modifier
                     .fillMaxSize()
-                    .padding(16.dp),
+                    .padding(8.dp),
-            )
+            ) {
-            if (image.description.isNotBlank()) {
+                IconButton(
-                Text(
+                    onClick = onDismiss,
-                    text = image.description,
-                    fontSize = AppTypography.bodyMedium,
-                    color = Color.White.copy(alpha = 0.7f),
                     modifier = Modifier
-                        .align(Alignment.BottomCenter)
+                        .align(Alignment.TopStart)
-                        .padding(bottom = 32.dp),
+                        .size(48.dp),
-                )
+                ) {
+                    Icon(
+                        imageVector = Icons.Default.Close,
+                        contentDescription = "关闭",
+                        tint = Color.White,
+                    )
+                }
+                IconButton(
+                    onClick = {
+                        scope.launch {
+                            val msg = saveImageToGallery(context, image.url)
+                            withContext(Dispatchers.Main) {
+                                Toast.makeText(context, msg, Toast.LENGTH_SHORT).show()
+                            }
+                        }
+                    },
+                    modifier = Modifier
+                        .align(Alignment.TopEnd)
+                        .size(48.dp),
+                ) {
+                    Icon(
+                        imageVector = Icons.Default.Download,
+                        contentDescription = "保存到相册",
+                        tint = Color.White,
+                    )
+                }
             }
+
         }
     }
 }
+
+private suspend fun saveImageToGallery(context: Context, url: String?): String =
+    withContext(Dispatchers.IO) {
+        if (url.isNullOrBlank()) return@withContext "图片地址无效"
+        try {
+            val connection = URL(url).openConnection().apply {
+                connectTimeout = 15_000
+                readTimeout = 15_000
+            }
+            connection.inputStream.use { input ->
+                val bytes = input.readBytes()
+                if (bytes.isEmpty()) return@withContext "图片数据为空"
+                val mimeType = connection.contentType?.substringBefore(";")?.trim() ?: "image/jpeg"
+                val isPng = mimeType.equals("image/png", ignoreCase = true)
+                val extension = if (isPng) "png" else "jpg"
+                val displayName = "memoir_${System.currentTimeMillis()}.$extension"
+                val contentValues = ContentValues().apply {
+                    put(MediaStore.Images.Media.DISPLAY_NAME, displayName)
+                    put(MediaStore.Images.Media.MIME_TYPE, mimeType)
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                        put(MediaStore.Images.Media.RELATIVE_PATH, "Pictures/LifeEcho")
+                        put(MediaStore.Images.Media.IS_PENDING, 1)
+                    }
+                }
+                val uri = context.contentResolver.insert(
+                    MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
+                    contentValues,
+                ) ?: return@withContext "保存失败"
+                context.contentResolver.openOutputStream(uri)?.use { out ->
+                    out.write(bytes)
+                }
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                    contentValues.clear()
+                    contentValues.put(MediaStore.Images.Media.IS_PENDING, 0)
+                    context.contentResolver.update(uri, contentValues, null, null)
+                }
+                "已保存到相册"
+            }
+        } catch (e: Exception) {
+            e.message ?: "保存失败"
+        }
+    }

app-android/app/src/main/java/com/huaga/life_echo/ui/screens/MyMemoirScreen.kt

@@ -248,7 +248,11 @@ fun MyMemoirScreen(
                     onBackClick = { viewModel.toggleFullTextReading() }
                 )
             } else if (selectedChapter != null) {
-                // 章节阅读视图
+                // 章节阅读视图：序号与列表一致，按在 chapterDtos 中的位置
+                val selectedDisplayIndex = remember(selectedChapter, chapterDtos) {
+                    val idx = chapterDtos.indexOfFirst { it.id == selectedChapter!!.id }
+                    if (idx >= 0) idx + 1 else null
+                }
                 val chapterContent = remember(selectedChapter, chapterDtos) {
                     val chapterDto = chapterDtos.find { it.id == selectedChapter!!.id }
                     ChapterContentDto(
@@ -375,7 +379,7 @@ fun MyMemoirScreen(
                         }
                     }
                     
-                    ChapterReadingView(chapter = chapterContent)
+                    ChapterReadingView(chapter = chapterContent, displayIndex = selectedDisplayIndex)
                 }
             }
         } else {
@@ -485,14 +489,19 @@ private fun MemoirTableOfContents(
                         )
                     }
                     
-                    // 章节列表（始终显示所有章节）；大字模式下卡片间距更大
+                    // 章节列表（始终显示所有章节）；序号按列表位置动态显示，避免预设章节与新增章节混序
-                    items(chapterDtos, key = { it.id }) { chapterDto ->
+                    items(
+                        count = chapterDtos.size,
+                        key = { chapterDtos[it].id }
+                    ) { index ->
+                        val chapterDto = chapterDtos[index]
                         val isEmpty = chapterDto.content.isBlank()
                         ChapterCard(
                             chapter = chapterDto,
                             isEmpty = isEmpty,
                             onClick = { onChapterClick(chapterDto) },
-                            onGoChat = if (isEmpty) onNavigateToChat else null
+                            onGoChat = if (isEmpty) onNavigateToChat else null,
+                            displayIndex = index + 1
                         )
                         Spacer(modifier = Modifier.height(cardSpacing))
                     }