修复动态内容为空时的崩溃问题并优化UI

- 将`Moment`实体中的`momentTextContent`字段类型从`String`修改为`String?`，以允许其为空，修复了多处因空内容引发的崩溃。
- 在多个UI组件中（如新闻、短视频、推荐等）添加了对`momentTextContent`的空值检查。
- 优化了“发现”页中智能体（Agent）卡片的UI样式，使用大图背景和渐变效果，并调整了按钮和文本布局。
- 为图片加载组件（`CustomAsyncImage`）增加了默认占位图，提升了加载过程中的用户体验。
- 在热门动态列表中，过滤掉没有图片的动态，确保UI显示正常。
- 修复了Prompt推荐页面的用户资料和AI聊天导航逻辑，并增加了防崩溃处理。

app/src/main/java/com/aiosman/ravenow/entity/Moment.kt

@@ -327,7 +327,7 @@ data class MomentEntity(
     // 是否关注
     val followStatus: Boolean,
     // 动态内容
-    val momentTextContent: String,
+    val momentTextContent: String?,
     // 动态图片
     @DrawableRes val momentPicture: Int,
     // 点赞数

app/src/main/java/com/aiosman/ravenow/ui/composables/Agent.kt

@@ -73,7 +73,8 @@ fun AgentCard(
                         agentEntity.avatar,
                         contentDescription = agentEntity.openId,
                         modifier = Modifier.size(40.dp),
-                        contentScale = ContentScale.Crop
+                        contentScale = ContentScale.Crop,
+                        defaultRes = com.aiosman.ravenow.R.mipmap.group_copy
                     )
                 }
                 Column(

app/src/main/java/com/aiosman/ravenow/ui/composables/Moment.kt

@@ -379,9 +379,9 @@ fun MomentContentGroup(
             )
         }
     }
-    if (momentEntity.momentTextContent.isNotEmpty()) {
+    if (!momentEntity.momentTextContent.isNullOrEmpty()) {
         Text(
-            text = momentEntity.momentTextContent,
+            text = momentEntity.momentTextContent ?: "",
             modifier = Modifier
                 .fillMaxWidth()
                 .padding(start = 16.dp, end = 16.dp, top = 8.dp),

app/src/main/java/com/aiosman/ravenow/ui/index/tabs/ai/Agent.kt

@@ -467,8 +467,7 @@ fun AgentCardSquare(
     navController: NavHostController
 ) {
     val AppColors = LocalAppTheme.current
-    val cardHeight = 180.dp
+    val cardHeight = 210.dp
-    val avatarSize = cardHeight / 3  // 头像大小为方块高度的三分之一
 
     // 防抖状态
     var lastClickTime by remember { mutableStateOf(0L) }
@@ -477,96 +476,76 @@ fun AgentCardSquare(
         modifier = Modifier
             .fillMaxWidth()
             .height(cardHeight)
-            .background(AppColors.secondaryBackground, RoundedCornerShape(12.dp))
+            .clip(RoundedCornerShape(12.dp))
-            .clickable {
+            .noRippleClickable {
                 if (DebounceUtils.simpleDebounceClick(lastClickTime, 500L) {
                         viewModel.goToProfile(agentItem.openId, navController)
                     }) {
                     lastClickTime = System.currentTimeMillis()
                 }
-            },
+            }
-        contentAlignment = Alignment.TopCenter
     ) {
-        Box(
+        // 背景大图
-            modifier = Modifier
-                .offset(y = 4.dp)
-                .size(avatarSize)
-                .background(AppColors.background, RoundedCornerShape(avatarSize / 2))
-                .clip(RoundedCornerShape(avatarSize / 2)),
-            contentAlignment = Alignment.Center
-        ) {
-            Image(
-                painter = painterResource(R.mipmap.group_copy),
-                contentDescription = "默认头像",
-                modifier = Modifier.size(avatarSize),
-            )
-            if (agentItem.avatar.isNotEmpty()) {
             CustomAsyncImage(
                 imageUrl = agentItem.avatar,
-                    contentDescription = "Agent头像",
+            contentDescription = agentItem.title,
-                    modifier = Modifier
+            modifier = Modifier.fillMaxSize(),
-                        .size(avatarSize)
+                contentScale = androidx.compose.ui.layout.ContentScale.Crop,
-                        .clip(RoundedCornerShape(avatarSize / 2)),
+            defaultRes = R.mipmap.rider_pro_agent
-                    contentScale = androidx.compose.ui.layout.ContentScale.Crop
         )
-            }
-        }
 
-        // 内容区域（名称和描述）
+        // 底部渐变与文字
+        Box(
+            modifier = Modifier
+                .align(Alignment.BottomStart)
+                .fillMaxWidth()
+                .background(
+                    Brush.verticalGradient(
+                        0f to Color.Transparent,
+                        1f to Color(0xB2000000)
+                    )
+                )
+                .padding(12.dp)
+        ) {
         Column(
             modifier = Modifier
                 .fillMaxWidth()
-                .padding(top = 4.dp + avatarSize + 8.dp, start = 8.dp, end = 8.dp, bottom = 48.dp), // 为底部聊天按钮留出空间
+                    .padding(bottom = 40.dp) // 为底部聊天按钮预留空间
-            horizontalAlignment = Alignment.CenterHorizontally
         ) {
             androidx.compose.material3.Text(
                 text = agentItem.title,
+                    color = Color.White,
                 fontSize = 14.sp,
-                fontWeight = androidx.compose.ui.text.font.FontWeight.W600,
+                    fontWeight = androidx.compose.ui.text.font.FontWeight.W700,
-                color = AppColors.text,
                 maxLines = 1,
-                overflow = androidx.compose.ui.text.style.TextOverflow.Ellipsis
+                    overflow = TextOverflow.Ellipsis
             )
-
+                Spacer(modifier = Modifier.height(4.dp))
-            Spacer(modifier = Modifier.height(8.dp))
-
             androidx.compose.material3.Text(
                 text = agentItem.desc,
-                fontSize = 12.sp,
+                    color = Color.White.copy(alpha = 0.92f),
-                color = AppColors.secondaryText,
+                    fontSize = 11.sp,
                 maxLines = 2,
-                overflow = androidx.compose.ui.text.style.TextOverflow.Ellipsis,
+                    overflow = TextOverflow.Ellipsis
-                modifier = Modifier.weight(1f, fill = false)
             )
             }
+        }
 
-        // 聊天按钮
+        // 底部居中 Chat 按钮
         Box(
             modifier = Modifier
                 .align(Alignment.BottomCenter)
                 .padding(bottom = 12.dp)
-                .width(60.dp)
+                .width(70.dp)
                 .height(32.dp)
-                .background(
+                .background(AppColors.text, RoundedCornerShape(16.dp))
-                    color = AppColors.text,
+                .noRippleClickable {
-                    shape = RoundedCornerShape(
-                        topStart = 14.dp,
-                        topEnd = 14.dp,
-                        bottomStart = 0.dp,
-                        bottomEnd = 14.dp
-                    )
-                )
-                .clickable {
                     if (DebounceUtils.simpleDebounceClick(lastClickTime, 500L) {
-                            // 检查游客模式，如果是游客则跳转登录
                             if (GuestLoginCheckOut.needLogin(GuestLoginCheckOutScene.CHAT_WITH_AGENT)) {
                                 navController.navigate(NavigationRoute.Login.route)
                             } else {
                                 viewModel.createSingleChat(agentItem.openId)
-                                viewModel.goToChatAi(
+                                viewModel.goToChatAi(agentItem.openId, navController)
-                                    agentItem.openId,
-                                    navController = navController
-                                )
                             }
                         }) {
                         lastClickTime = System.currentTimeMillis()
@@ -576,9 +555,9 @@ fun AgentCardSquare(
         ) {
             androidx.compose.material3.Text(
                 text = stringResource(R.string.chat),
-                fontSize = 15.sp,
                 color = AppColors.background,
-                fontWeight = androidx.compose.ui.text.font.FontWeight.W500
+                fontSize = 13.sp,
+                fontWeight = androidx.compose.ui.text.font.FontWeight.W600
             )
         }
     }
@@ -658,7 +637,8 @@ fun AgentLargeCard(
             imageUrl = agentItem.avatar,
             contentDescription = agentItem.title,
             modifier = Modifier.fillMaxSize(),
-            contentScale = androidx.compose.ui.layout.ContentScale.Crop
+            contentScale = androidx.compose.ui.layout.ContentScale.Crop,
+            defaultRes = R.mipmap.rider_pro_agent
         )
 
         // 底部渐变与文字
@@ -776,23 +756,16 @@ fun AgentCard2(viewModel: AgentViewModel,agentItem: AgentItem,navController: Nav
                 },
             contentAlignment = Alignment.Center
         ) {
-            Image(
-                painter = painterResource(R.mipmap.group_copy),
-                contentDescription = "默认头像",
-                modifier = Modifier.size(48.dp),
-            )
-
-            if (agentItem.avatar.isNotEmpty()) {
             CustomAsyncImage(
                 imageUrl = agentItem.avatar,
                 contentDescription = "Agent头像",
                 modifier = Modifier
                     .size(48.dp)
                     .clip(RoundedCornerShape(24.dp)),
-                    contentScale = androidx.compose.ui.layout.ContentScale.Crop
+                contentScale = androidx.compose.ui.layout.ContentScale.Crop,
+                defaultRes = R.mipmap.group_copy
             )
         }
-        }
 
         Spacer(modifier = Modifier.width(12.dp))
 
@@ -998,7 +971,6 @@ fun ChatRoomCard(
         // 优先显示banner，如果没有banner则显示头像
         val imageUrl = if (chatRoom.banner.isNotEmpty()) chatRoom.banner else chatRoom.avatar
 
-        if (imageUrl.isNotEmpty()) {
         CustomAsyncImage(
             imageUrl = imageUrl,
             contentDescription = if (chatRoom.banner.isNotEmpty()) "房间banner" else "房间头像",
@@ -1010,17 +982,9 @@ fun ChatRoomCard(
                     topEnd = 12.dp,
                     bottomStart = 0.dp,
                     bottomEnd = 0.dp)),
-                contentScale = androidx.compose.ui.layout.ContentScale.Crop
+            contentScale = androidx.compose.ui.layout.ContentScale.Crop,
+            defaultRes = R.mipmap.rider_pro_agent
         )
-        } else {
-            // 默认房间图标
-            Image(
-                painter = painterResource(R.mipmap.rider_pro_agent),
-                contentDescription = "默认房间图标",
-                modifier = Modifier.size(cardSize * 0.4f),
-                colorFilter = ColorFilter.tint(AppColors.secondaryText)
-            )
-        }
 
         // 房间名称，重叠在底部
         Box(

app/src/main/java/com/aiosman/ravenow/ui/index/tabs/moment/tabs/hot/Moment.kt

@@ -136,22 +136,27 @@ fun DiscoverView() {
         contentPadding = androidx.compose.foundation.layout.PaddingValues(horizontal = 8.dp, vertical = 4.dp)
     ) {
         items(moments) { momentItem ->
+            // 如果图片列表为空，跳过这个 item
+            if (momentItem.images.isEmpty()) {
+                return@items
+            }
+            
             val debouncer = rememberDebouncer()
 
             val textContent = momentItem.momentTextContent
             // 对于英文和日文，每行字符数会更少，使用更保守的估算
-            val estimatedCharsPerLine = if (textContent.isNotEmpty()) {
+            val estimatedCharsPerLine = if (!textContent.isNullOrEmpty()) {
                 // 检测是否包含非中文字符（英文、日文等）
-                val hasNonChinese = textContent.any { 
+                val hasNonChinese = textContent?.any { 
                     val code = it.code
                     !(code >= 0x4E00 && code <= 0x9FFF) // 不在中文字符范围内
-                }
+                } ?: false
                 if (hasNonChinese) 15 else 20 // 英文/日文每行更少字符
             } else {
                 20
             }
-            val textLines = if (textContent.isNotEmpty()) {
+            val textLines = if (!textContent.isNullOrEmpty()) {
-                val estimatedLines = (textContent.length / estimatedCharsPerLine) + 1
+                val estimatedLines = ((textContent?.length ?: 0) / estimatedCharsPerLine) + 1
                 minOf(estimatedLines, 2) // 最多2行
             } else {
                 0
@@ -209,9 +214,9 @@ fun DiscoverView() {
                             .padding(horizontal = 8.dp, vertical = 8.dp)
                     ) {
                         // 文本内容区域，限制最大高度
-                        if (momentItem.momentTextContent.isNotEmpty()) {
+                        if (!momentItem.momentTextContent.isNullOrEmpty()) {
                             androidx.compose.material3.Text(
-                                text = momentItem.momentTextContent,
+                                text = momentItem.momentTextContent ?: "",
                                 modifier = Modifier.fillMaxWidth(),
                                 fontSize = 12.sp,
                                 color = AppColors.text,

app/src/main/java/com/aiosman/ravenow/ui/index/tabs/moment/tabs/news/FullArticleModal.kt

@@ -150,7 +150,7 @@ fun FullArticleModal(
                 
                 // 帖子内容
                 NewsContent(
-                    content = if (moment.newsContent.isNotEmpty()) moment.newsContent else moment.momentTextContent,
+                    content = if (moment.newsContent.isNotEmpty()) moment.newsContent else (moment.momentTextContent ?: ""),
                     images = moment.images,
                     context = context
                 )

app/src/main/java/com/aiosman/ravenow/ui/index/tabs/moment/tabs/news/NewsScreen.kt

@@ -288,7 +288,7 @@ fun NewsItem(
             
             // 新闻内容（超出使用省略号）
             Text(
-                text = if (moment.newsContent.isNotEmpty()) moment.newsContent else moment.momentTextContent,
+                text = if (moment.newsContent.isNotEmpty()) moment.newsContent else (moment.momentTextContent ?: ""),
                 modifier = Modifier
                     .fillMaxWidth()
                     .padding(horizontal = 16.dp),

app/src/main/java/com/aiosman/ravenow/ui/index/tabs/moment/tabs/recommend/PostRecommendationItem.kt

@@ -132,12 +132,12 @@ fun PostRecommendationItem(
                 }
                 
                 // 文字内容
-                if (moment.momentTextContent.isNotEmpty()) {
+                if (!moment.momentTextContent.isNullOrEmpty()) {
                     Text(
                         modifier = Modifier
                             .fillMaxWidth(0.8f)
                             .padding(top = 4.dp),
-                        text = moment.momentTextContent,
+                        text = moment.momentTextContent ?: "",
                         fontSize = 16.sp,
                         color = Color.White,
                         style = TextStyle(fontWeight = FontWeight.Bold),

app/src/main/java/com/aiosman/ravenow/ui/index/tabs/moment/tabs/recommend/PromptRecommendationItem.kt

@@ -1,6 +1,7 @@
 package com.aiosman.ravenow.ui.index.tabs.moment.tabs.recommend
 
 import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
@@ -12,6 +13,7 @@ import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -25,8 +27,12 @@ import androidx.compose.ui.unit.sp
 import com.aiosman.ravenow.LocalAppTheme
 import com.aiosman.ravenow.LocalNavController
 import com.aiosman.ravenow.R
+import com.aiosman.ravenow.data.UserService
+import com.aiosman.ravenow.data.UserServiceImpl
 import com.aiosman.ravenow.ui.NavigationRoute
 import com.aiosman.ravenow.ui.composables.CustomAsyncImage
+import com.aiosman.ravenow.ui.navigateToChatAi
+import kotlinx.coroutines.launch
 
 /**
  * Prompt推荐Item组件
@@ -43,11 +49,47 @@ fun PromptRecommendationItem(
 ) {
     val AppColors = LocalAppTheme.current
     val navController = LocalNavController.current
+    val scope = rememberCoroutineScope()
+    val userService: UserService = UserServiceImpl()
+    
+    // 导航到个人资料
+    fun navigateToProfile() {
+        scope.launch {
+            try {
+                val profile = userService.getUserProfileByOpenId(openId)
+                // Prompt推荐的一定是AI账号，直接传递isAiAccount = true
+                navController.navigate(
+                    NavigationRoute.AccountProfile.route
+                        .replace("{id}", profile.id.toString())
+                        .replace("{isAiAccount}", "true")
+                )
+            } catch (e: Exception) {
+                // 处理错误，避免崩溃
+                e.printStackTrace()
+            }
+        }
+    }
+    
+    // 导航到AI聊天
+    fun navigateToChatAi() {
+        scope.launch {
+            try {
+                val profile = userService.getUserProfileByOpenId(openId)
+                navController.navigateToChatAi(profile.id.toString())
+            } catch (e: Exception) {
+                // 处理错误，避免崩溃
+                e.printStackTrace()
+            }
+        }
+    }
     
     Box(
         modifier = modifier
             .fillMaxSize()
             .background(Color.Black)
+            .clickable(
+                onClick = { navigateToProfile() }
+            )
     ) {
         // 背景大图
         CustomAsyncImage(
@@ -122,8 +164,8 @@ fun PromptRecommendationItem(
                 // Start chatting 按钮
                 Button(
                     onClick = {
-                        // 导航到聊天页面
+                        // 导航到AI聊天页面（区分AI聊天和普通聊天）
-                        navController.navigate("${NavigationRoute.Chat.route}/$openId")
+                        navigateToChatAi()
                     },
                     modifier = Modifier
                         .fillMaxWidth()

app/src/main/java/com/aiosman/ravenow/ui/index/tabs/moment/tabs/recommend/VideoRecommendationItem.kt

@@ -278,12 +278,12 @@ fun VideoRecommendationItem(
                     color = Color.White,
                     style = TextStyle(fontWeight = FontWeight.Bold)
                 )
-                if (moment.momentTextContent.isNotEmpty()) {
+                if (!moment.momentTextContent.isNullOrEmpty()) {
                     Text(
                         modifier = Modifier
                             .fillMaxWidth(0.8f)
                             .padding(top = 4.dp),
-                        text = moment.momentTextContent,
+                        text = moment.momentTextContent ?: "",
                         fontSize = 16.sp,
                         color = Color.White,
                         style = TextStyle(fontWeight = FontWeight.Bold),

app/src/main/java/com/aiosman/ravenow/ui/index/tabs/profile/composable/MomentCard.kt

@@ -178,7 +178,7 @@ fun TimeGroup(time: String = "2024.06.08 12:23") {
 
 @Composable
 fun ProfileMomentCard(
-    content: String,
+    content: String?,
     imageUrl: String,
     like: String,
     comment: String,
@@ -220,7 +220,7 @@ fun ProfileMomentCard(
                         columnHeight = coordinates.size.height
                     }
             ) {
-                if (content.isNotEmpty()) {
+                if (!content.isNullOrEmpty()) {
                     MomentCardTopContent(content)
                 }
                 MomentCardPicture(imageUrl, momentEntity = momentEntity)
@@ -237,7 +237,7 @@ fun ProfileMomentCard(
 }
 
 @Composable
-fun MomentCardTopContent(content: String) {
+fun MomentCardTopContent(content: String?) {
     val AppColors = LocalAppTheme.current
     Row(
         modifier = Modifier
@@ -247,7 +247,7 @@ fun MomentCardTopContent(content: String) {
     ) {
         Text(
             modifier = Modifier.padding(top = 16.dp, bottom = 0.dp, start = 16.dp, end = 16.dp),
-            text = content, fontSize = 16.sp, color = AppColors.text
+            text = content ?: "", fontSize = 16.sp, color = AppColors.text
         )
     }
 }

app/src/main/java/com/aiosman/ravenow/ui/index/tabs/shorts/ShortViewCompose.kt

@@ -447,12 +447,12 @@ fun VideoPlayer(
                     color = Color.White,
                     style = TextStyle(fontWeight = FontWeight.Bold)
                 )
-                if (moment.momentTextContent.isNotEmpty()) {
+                if (!moment.momentTextContent.isNullOrEmpty()) {
                     Text(
                         modifier = Modifier
                             .fillMaxWidth()
                             .padding(top = 4.dp),
-                        text = moment.momentTextContent,
+                        text = moment.momentTextContent ?: "",
                         fontSize = 16.sp,
                         color = Color.White,
                         style = TextStyle(fontWeight = FontWeight.Bold),