diff --git a/static/src/components/chat/ChatArea.vue b/static/src/components/chat/ChatArea.vue
index 74d3dce..35fe352 100644
--- a/static/src/components/chat/ChatArea.vue
+++ b/static/src/components/chat/ChatArea.vue
@@ -52,6 +52,8 @@
           <template v-if="blockDisplayMode === 'minimal'">
             <MinimalBlocks
               :actions="msg.actions || []"
+              :conversation-running="streamingMessage"
+              :is-latest-message="index === latestMessageIndex"
               :icon-style="iconStyleSafe"
               :get-tool-icon="getToolIcon"
               :get-tool-status-text="getToolStatusText"
@@ -423,6 +425,7 @@ const userName = computed(() => {
 const filteredMessages = computed(() =>
   (props.messages || []).filter(m => !(m && m.metadata && m.metadata.system_injected_image) && m.role !== 'system')
 );
+const latestMessageIndex = computed(() => filteredMessages.value.length - 1);
 
 const DEFAULT_GENERATING_TEXT = '生成中…';
 const rootEl = ref<HTMLElement | null>(null);
diff --git a/static/src/components/chat/MinimalBlocks.vue b/static/src/components/chat/MinimalBlocks.vue
index a326fa2..20835e1 100644
--- a/static/src/components/chat/MinimalBlocks.vue
+++ b/static/src/components/chat/MinimalBlocks.vue
@@ -113,6 +113,8 @@ interface BlockGroup {
 
 const props = defineProps<{
   actions: Action[];
+  conversationRunning?: boolean;
+  isLatestMessage?: boolean;
   iconStyle?: (name: string) => any;
   getToolIcon?: (tool: any) => string;
   getToolStatusText?: (tool: any) => string;
@@ -129,6 +131,15 @@ const personalizationStore = usePersonalizationStore();
 const expandedGroups = ref(new Set<string>());
 const thinkingRefs = new Map<string, HTMLElement>();
 const summaryLoaders = new Map<string, Component>();
+const SUMMARY_PREVIEW_MAX_CHARS = 25;
+
+const truncateSummaryPreview = (raw: string) => {
+  const text = typeof raw === 'string' ? raw : '';
+  if (text.length > SUMMARY_PREVIEW_MAX_CHARS) {
+    return `${text.slice(0, SUMMARY_PREVIEW_MAX_CHARS)}...`;
+  }
+  return text;
+};
 
 // 获取摘要组的加载动画组件（每次action类型切换时随机一次）
 const getSummaryLoader = (groupId: string) => {
@@ -237,11 +248,11 @@ const getSummaryPreview = (actions: Action[]) => {
   if (!currentStep) return '';
 
   if (currentStep.type === 'thinking') {
-    // 思考内容：最多显示到第一个换行，且不超过50字符
+    // 思考内容：最多显示到第一个换行，且不超过25字符（不含...）
     const content = currentStep.content || '';
     const firstLineEnd = content.indexOf('\n');
     const textToShow = firstLineEnd > 0 ? content.substring(0, firstLineEnd) : content;
-    return textToShow.length > 50 ? textToShow.substring(0, 50) + '...' : textToShow;
+    return truncateSummaryPreview(textToShow);
   } else if (currentStep.type === 'tool') {
     // 工具：优先显示 intent_rendered 或 intent_full
     const tool = currentStep.tool;
@@ -254,7 +265,7 @@ const getSummaryPreview = (actions: Action[]) => {
       // 开启intent模式且有intent时，只显示intent
       const firstLineEnd = intentText.indexOf('\n');
       const textToShow = firstLineEnd > 0 ? intentText.substring(0, firstLineEnd) : intentText;
-      return textToShow.length > 50 ? textToShow.substring(0, 50) + '...' : textToShow;
+      return truncateSummaryPreview(textToShow);
     }
 
     // 没有intent或未开启intent模式时显示状态
@@ -274,6 +285,10 @@ const getSummaryPreview = (actions: Action[]) => {
 
 // 判断摘要组是否正在运行（显示加载动画还是对勾）
 const isSummaryRunning = (actions: Action[], groupId: string) => {
+  if (!props.conversationRunning || !props.isLatestMessage) {
+    return false;
+  }
+
   // 找到当前 group 在 blockGroups 中的索引
   const currentIndex = blockGroups.value.findIndex(g => g.id === groupId);
   if (currentIndex === -1) return false;
@@ -465,10 +480,11 @@ watch(() => props.actions, () => {
 
 /* 摘要行（只有文字） */
 .summary-line-text {
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-  padding: 0;
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto;
+  align-items: start;
+  column-gap: 8px;
+  padding: 0 20px 0 15px;
   cursor: pointer;
   transition: background-color 0.2s;
 }
@@ -478,24 +494,26 @@ watch(() => props.actions, () => {
 }
 
 .summary-content-wrapper {
-  flex: 1;
+  min-width: 0;
   font-size: 15px;
   color: var(--claude-text-secondary);
   line-height: 1.7;
-  padding: 0 20px 0 15px;
+  padding: 0;
 }
 
 .summary-preview {
   display: block;
-  overflow: hidden;
-  text-overflow: ellipsis;
-  white-space: nowrap;
+  white-space: normal;
+  overflow-wrap: anywhere;
+  word-break: break-word;
   color: inherit;
 }
 
 .summary-status-icon {
   flex-shrink: 0;
-  margin-left: 8px;
+  margin-left: 0;
+  align-self: start;
+  margin-top: calc((1.7em - 18px) / 2);
   display: flex;
   align-items: center;
   justify-content: center;
diff --git a/static/src/components/chat/loaders/BouncingSquaresLoader.vue b/static/src/components/chat/loaders/BouncingSquaresLoader.vue
index 67d5c41..c198fb9 100644
--- a/static/src/components/chat/loaders/BouncingSquaresLoader.vue
+++ b/static/src/components/chat/loaders/BouncingSquaresLoader.vue
@@ -12,46 +12,43 @@
 
 <style scoped>
 .bouncing-squares-loader {
-  width: 40px;
+  --square-size: 3px;
+  --square-gap: 10px;
+  display: grid;
+  grid-template-columns: repeat(3, var(--square-size));
+  column-gap: var(--square-gap);
+  align-items: end;
+  width: calc(3 * var(--square-size) + 2 * var(--square-gap));
   height: 20px;
-  position: relative;
 }
 
 .square {
-  width: 3px;
-  height: 3px;
-  position: absolute;
+  width: var(--square-size);
+  height: var(--square-size);
   background-color: var(--claude-text-tertiary);
-  left: 15%;
-  transform-origin: 50%;
+  transform-origin: center bottom;
   animation: bounce-square .5s alternate infinite ease;
 }
 
 @keyframes bounce-square {
   0% {
-    top: 20px;
-    height: 2px;
-    transform: scaleX(1.7);
+    transform: translateY(0) scaleX(1.7) scaleY(0.7);
   }
 
   40% {
-    height: 3px;
-    transform: scaleX(1);
+    transform: translateY(-8px) scaleX(1) scaleY(1);
   }
 
   100% {
-    top: 0%;
+    transform: translateY(-17px) scaleX(1) scaleY(1);
   }
 }
 
 .square:nth-child(2) {
-  left: 45%;
   animation-delay: .2s;
 }
 
 .square:nth-child(3) {
-  left: auto;
-  right: 15%;
   animation-delay: .3s;
 }
 </style>
diff --git a/static/src/components/chat/loaders/RippleLoader.vue b/static/src/components/chat/loaders/RippleLoader.vue
index dd44af1..00c4a9e 100644
--- a/static/src/components/chat/loaders/RippleLoader.vue
+++ b/static/src/components/chat/loaders/RippleLoader.vue
@@ -19,20 +19,19 @@
 <style scoped>
 .ripple-loader {
   --cell-size: 3px;
-  --cell-spacing: 2px;
-  --cells: 3;
-  --total-size: calc(var(--cells) * (var(--cell-size) + 2 * var(--cell-spacing)));
-  display: flex;
-  flex-wrap: wrap;
-  width: var(--total-size);
-  height: var(--total-size);
+  --cell-gap: 4px;
+  display: grid;
+  grid-template-columns: repeat(3, var(--cell-size));
+  grid-template-rows: repeat(3, var(--cell-size));
+  gap: var(--cell-gap);
+  width: calc(3 * var(--cell-size) + 2 * var(--cell-gap));
+  height: calc(3 * var(--cell-size) + 2 * var(--cell-gap));
 }
 
 .cell {
-  flex: 0 0 var(--cell-size);
-  margin: var(--cell-spacing);
+  width: var(--cell-size);
+  height: var(--cell-size);
   background-color: transparent;
-  box-sizing: border-box;
   animation: 1.5s ripple ease infinite;
 }
 
diff --git a/static/src/components/chat/loaders/index.ts b/static/src/components/chat/loaders/index.ts
index af30df3..299ae44 100644
--- a/static/src/components/chat/loaders/index.ts
+++ b/static/src/components/chat/loaders/index.ts
@@ -18,8 +18,42 @@ export const loaderPool: Component[] = [
   RippleLoader
 ];
 
-// 随机获取一个加载动画
+// 至少间隔多少次后才允许重复（例如 4 表示最近 4 次不重复）
+const MIN_NON_REPEAT_WINDOW = 4;
+const recentPickedIndices: number[] = [];
+
+const pickRandomIndex = (indices: number[]) => {
+  const randomIndex = Math.floor(Math.random() * indices.length);
+  return indices[randomIndex];
+};
+
+// 随机获取一个加载动画（带“近期不重复”约束）
 export function getRandomLoader(): Component {
-  const randomIndex = Math.floor(Math.random() * loaderPool.length);
-  return loaderPool[randomIndex];
+  const poolSize = loaderPool.length;
+  if (poolSize === 0) {
+    throw new Error('loaderPool 不能为空');
+  }
+
+  // 不重复窗口不能超过 poolSize - 1，否则无解
+  const nonRepeatWindow = Math.max(0, Math.min(MIN_NON_REPEAT_WINDOW, poolSize - 1));
+
+  let candidateIndices = Array.from({ length: poolSize }, (_, i) => i);
+  if (nonRepeatWindow > 0 && recentPickedIndices.length > 0) {
+    const blocked = new Set(recentPickedIndices.slice(-nonRepeatWindow));
+    const filtered = candidateIndices.filter((idx) => !blocked.has(idx));
+    if (filtered.length > 0) {
+      candidateIndices = filtered;
+    }
+  }
+
+  const pickedIndex = pickRandomIndex(candidateIndices);
+  recentPickedIndices.push(pickedIndex);
+
+  // 控制历史队列长度，避免无限增长
+  const maxHistory = Math.max(poolSize * 2, nonRepeatWindow + 1);
+  if (recentPickedIndices.length > maxHistory) {
+    recentPickedIndices.splice(0, recentPickedIndices.length - maxHistory);
+  }
+
+  return loaderPool[pickedIndex];
 }
diff --git a/static/src/styles/components/chat/_chat-area.scss b/static/src/styles/components/chat/_chat-area.scss
index bcbfe63..9bd709a 100644
--- a/static/src/styles/components/chat/_chat-area.scss
+++ b/static/src/styles/components/chat/_chat-area.scss
@@ -112,8 +112,8 @@
 }
 
 .scroll-lock-toggle {
-    position: absolute;
-    right: 28px;
+    position: fixed;
+    right: 8px;
     bottom: 140px;
     z-index: 25;
     display: flex;
@@ -126,7 +126,7 @@
 }
 
 .chat-container--immersive .scroll-lock-toggle {
-    right: calc((100% - min(900px, 100%)) / 2 + 24px);
+    right: 8px;
 }
 
 .chat-container--mobile {