refactor: 优化聊天和回忆录相关UI组件

- 优化ChatHeader聊天头部组件
- 优化ChatInputField聊天输入组件
- 优化MessageList消息列表组件
- 重构BookInfoCard书籍信息卡片
- 优化ChapterCard章节卡片

app-android/app/src/main/java/com/huaga/life_echo/ui/components/chat/ChatHeader.kt

@@ -11,6 +11,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
@@ -20,17 +21,49 @@ import com.huaga.life_echo.ui.theme.LightPurple
 
 /**
  * 聊天头部组件
+ * 
+ * @param title 标题
+ * @param isOnline 在线状态
+ * @param onBackClick 返回按钮点击回调
+ * @param modifier 修饰符
+ * @param isTransparent 是否透明化（默认false）
+ * @param transparencyType 透明化类型：0=完全透明, 1=半透明, 2=渐变透明
+ * @param alpha 透明度（0.0-1.0），用于半透明模式
  */
 @Composable
 fun ChatHeader(
     title: String,
     isOnline: Boolean = true,
     onBackClick: () -> Unit,
-    modifier: Modifier = Modifier
+    modifier: Modifier = Modifier,
+    isTransparent: Boolean = false,
+    transparencyType: Int = 0, // 0=完全透明, 1=半透明, 2=渐变透明
+    alpha: Float = 0.5f
 ) {
+    val backgroundColor = when {
+        isTransparent && transparencyType == 0 -> Color.Transparent // 完全透明
+        isTransparent && transparencyType == 1 -> LightPurple.copy(alpha = alpha) // 半透明
+        isTransparent && transparencyType == 2 -> Color.Transparent // 渐变透明（使用Brush）
+        else -> LightPurple // 不透明
+    }
+    
+    val backgroundModifier = when {
+        isTransparent && transparencyType == 2 -> Modifier.background(
+            Brush.verticalGradient(
+                colors = listOf(
+                    LightPurple.copy(alpha = 0.95f),
+                    LightPurple.copy(alpha = 0.0f)
+                )
+            )
+        )
+        else -> Modifier
+    }
+    
     Surface(
-        color = LightPurple,
+        color = backgroundColor,
-        modifier = modifier.fillMaxWidth()
+        modifier = modifier
+            .fillMaxWidth()
+            .then(backgroundModifier)
     ) {
         Row(
             modifier = Modifier

app-android/app/src/main/java/com/huaga/life_echo/ui/components/chat/ChatInputField.kt

@@ -14,7 +14,7 @@ import androidx.compose.ui.unit.sp
 import com.huaga.life_echo.ui.theme.LightPurple
 
 /**
- * 聊天输入框组件（支持高度自适应）
+ * 聊天输入框组件（支持高度自适应和键盘自适应贴合）
  */
 @Composable
 fun ChatInputField(
@@ -27,13 +27,14 @@ fun ChatInputField(
 ) {
     var textFieldHeight by remember { mutableStateOf(56.dp) }
     
+    // 使用 windowInsetsPadding 实现键盘自适应贴合，确保输入框紧贴键盘
     Surface(
         modifier = modifier
             .fillMaxWidth()
             .shadow(4.dp)
-            .windowInsetsPadding(WindowInsets.ime),
+            .windowInsetsPadding(WindowInsets.ime), // 自适应键盘高度，紧贴键盘
         color = MaterialTheme.colorScheme.surface,
-        shape = RoundedCornerShape(topStart = 16.dp, topEnd = 16.dp)
+        shape = RoundedCornerShape(topStart = 24.dp, topEnd = 24.dp)
     ) {
         Row(
             modifier = Modifier
@@ -64,7 +65,7 @@ fun ChatInputField(
                         fontSize = 14.sp
                     )
                 },
-                shape = RoundedCornerShape(28.dp),
+                shape = RoundedCornerShape(36.dp),
                 colors = OutlinedTextFieldDefaults.colors(
                     unfocusedBorderColor = Color.Transparent,
                     focusedBorderColor = LightPurple,

app-android/app/src/main/java/com/huaga/life_echo/ui/components/chat/MessageList.kt

@@ -6,7 +6,7 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.material3.Divider
+import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
@@ -134,7 +134,7 @@ fun TimeDivider(
         verticalAlignment = Alignment.CenterVertically,
         horizontalArrangement = Arrangement.Center
     ) {
-        Divider(
+        HorizontalDivider(
             modifier = Modifier.weight(1f),
             color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.2f)
         )
@@ -146,7 +146,7 @@ fun TimeDivider(
             fontWeight = FontWeight.Normal
         )
         Spacer(modifier = Modifier.width(8.dp))
-        Divider(
+        HorizontalDivider(
             modifier = Modifier.weight(1f),
             color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.2f)
         )

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

@@ -39,18 +39,13 @@ fun BookInfoCard(
     modifier: Modifier = Modifier
 ) {
     var isEditingTitle by remember { mutableStateOf(false) }
-    var isEditingSubtitle by remember { mutableStateOf(false) }
     var editedTitle by remember { mutableStateOf(book.title) }
-    var editedSubtitle by remember { mutableStateOf(book.subtitle ?: "") }
     val keyboardController = LocalSoftwareKeyboardController.current
     
     // 当book变化时更新编辑状态
     LaunchedEffect(book.title) {
         editedTitle = book.title
     }
-    LaunchedEffect(book.subtitle) {
-        editedSubtitle = book.subtitle ?: ""
-    }
     
     Card(
         modifier = modifier.fillMaxWidth(),
@@ -114,71 +109,35 @@ fun BookInfoCard(
                 }
             }
             
-            Spacer(modifier = Modifier.height(8.dp))
-            
-            // 副标题（可选，可编辑）
-            if (book.subtitle != null || isEditingSubtitle) {
-                if (isEditingSubtitle) {
-                    TextField(
-                        value = editedSubtitle,
-                        onValueChange = { editedSubtitle = it },
-                        singleLine = true,
-                        keyboardOptions = KeyboardOptions(imeAction = ImeAction.Done),
-                        keyboardActions = KeyboardActions(
-                            onDone = {
-                                isEditingSubtitle = false
-                                keyboardController?.hide()
-                                onSubtitleChange?.invoke(if (editedSubtitle.isNotBlank()) editedSubtitle else null)
-                            }
-                        ),
-                        placeholder = {
-                            Text("副标题（可选）")
-                        },
-                        colors = TextFieldDefaults.colors(
-                            focusedTextColor = MaterialTheme.colorScheme.onSurfaceVariant,
-                            unfocusedTextColor = MaterialTheme.colorScheme.onSurfaceVariant
-                        ),
-                        textStyle = MaterialTheme.typography.titleMedium
-                    )
-                } else {
-                    Row(
-                        modifier = Modifier
-                            .clickable { isEditingSubtitle = true }
-                            .padding(vertical = 4.dp),
-                        verticalAlignment = Alignment.CenterVertically
-                    ) {
-                        Text(
-                            text = book.subtitle ?: "",
-                            fontSize = 18.sp,
-                            color = MaterialTheme.colorScheme.primary
-                        )
-                        Spacer(modifier = Modifier.width(8.dp))
-                        Icon(
-                            imageVector = AppIcons.Edit,
-                            contentDescription = "编辑",
-                            tint = MaterialTheme.colorScheme.onSurfaceVariant,
-                            modifier = Modifier.size(16.dp)
-                        )
-                    }
-                }
-            } else {
-                // 添加副标题按钮
-                Text(
-                    text = "+ 添加副标题",
-                    fontSize = 14.sp,
-                    color = MaterialTheme.colorScheme.primary.copy(alpha = 0.6f),
-                    modifier = Modifier.clickable { isEditingSubtitle = true }
-                )
-            }
-            
             Spacer(modifier = Modifier.height(4.dp))
             
-            // 最后更新时间
+            // 书籍统计信息
+            Row(
+                modifier = Modifier.fillMaxWidth(),
+                horizontalArrangement = Arrangement.Center
+            ) {
+                if (book.total_words != null && book.total_words > 0) {
                     Text(
-                text = TimeUtils.formatUpdateTime(book.lastUpdatedAt),
+                        text = "${book.total_words}字",
+                        fontSize = 12.sp,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                }
+                if (book.total_pages != null && book.total_pages > 0) {
+                    if (book.total_words != null && book.total_words > 0) {
+                        Text(
+                            text = " · ",
+                            fontSize = 12.sp,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                    }
+                    Text(
+                        text = "${book.total_pages}页",
                         fontSize = 12.sp,
                         color = MaterialTheme.colorScheme.onSurfaceVariant
                     )
                 }
             }
         }
+    }
+}

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

@@ -32,8 +32,8 @@ fun ChapterCard(
     modifier: Modifier = Modifier
 ) {
     val statusText = when (chapter.status) {
-        "completed" -> "已整理${if (chapter.pageCount != null) " · 约${chapter.pageCount}页" else ""}"
+        "completed" -> "已整理"
-        "partial" -> "部分整理${if (chapter.pageCount != null) " · 约${chapter.pageCount}页" else ""}"
+        "partial" -> "部分整理"
         else -> "待补充"
     }
     
@@ -62,7 +62,7 @@ fun ChapterCard(
                 contentAlignment = Alignment.Center
             ) {
                 Text(
-                    text = String.format("%02d", chapter.orderIndex),
+                    text = String.format("%02d", chapter.order_index),
                     fontSize = 18.sp,
                     fontWeight = FontWeight.Bold,
                     color = Color.White