修复: 审批不超时+重启恢复 + 其他小改

- APPROVAL_TIMEOUT_MS=Infinity(已决策:审批不做超时)
- V33 迁移: ai_conversations 加 pending_approvals 列
- save_conversation 持久化 pending_approvals
- ai_conversation_switch 从 DB 恢复 pending_approvals
- switchConversation 加 try/catch(对话不存在→建新)
- @项目 关联添加取消按钮(×)
- TopBar 底部无标题时图标右对齐
- TaskDetail.vue 删除重复 case

src/components/ai/ChatInput.vue

@@ -134,6 +134,7 @@
         </svg>
         <span class="ai-enrichment-badge">{{ enrichmentBadgeText }}</span>
       </button>
+      <button class="ai-enrichment-dismiss" @click="dismissEnrichment" title="取消关联">×</button>
       <div v-if="enrichmentExpanded" class="ai-enrichment-panel">
         <div class="ai-enrichment-label">{{ $t('aiChat.enrichmentLabel') }}</div>
         <pre class="ai-enrichment-body"><code>{{ enrichmentDetailText }}</code></pre>
@@ -485,6 +486,28 @@ const enrichmentDetailText = computed(() => {
   return lines.join('\n')
 })
 
+/** 取消 @项目 关联:清除 mentionSpan + 移除输入框中的 [@项目: xxx] 标记 */
+function dismissEnrichment() {
+  const projectSpans = pendingMentionSpans.value.filter(sp => sp.kind === 'project')
+  if (projectSpans.length === 0) return
+  // 从 inputText 中移除所有 [@项目: xxx] 标记
+  let text = inputText.value
+  for (const span of projectSpans) {
+    const label = text.slice(span.start, span.start + span.length)
+    // 替换标记 + 前后可能的空格为单个空格
+    const pattern = new RegExp(`\\s*${escapeRegex(label)}\s*`)
+    text = text.replace(pattern, ' ').trim()
+  }
+  inputText.value = text
+  // 清除 project 类型的 mentionSpan
+  pendingMentionSpans.value = pendingMentionSpans.value.filter(sp => sp.kind !== 'project')
+  enrichmentExpanded.value = false
+}
+
+function escapeRegex(s: string): string {
+  return s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
+}
+
 const mentionGroupLabel = computed(() => ({
   project: t('aiChat.mentionGroupProject'),
   task: t('aiChat.mentionGroupTask'),
@@ -1078,6 +1101,8 @@ defineExpose({
 
 /* ── ⑥.4 Phase 4: @项目展开摘要(输入区 enrichment 预览) ── */
 .ai-enrichment-bar {
+  display: flex;
+  align-items: center;
   margin-top: 6px;
   border: 0.5px solid color-mix(in srgb, var(--df-accent) 30%, transparent);
   border-radius: var(--df-radius);
@@ -1111,6 +1136,20 @@ defineExpose({
 .ai-enrichment-toggle--expanded .ai-enrichment-chevron {
   transform: rotate(180deg);
 }
+.ai-enrichment-dismiss {
+  flex-shrink: 0;
+  border: none;
+  background: transparent;
+  color: var(--df-text-dim);
+  cursor: pointer;
+  font-size: 14px;
+  padding: 0 4px;
+  line-height: 1;
+  transition: color 0.15s;
+}
+.ai-enrichment-dismiss:hover {
+  color: var(--df-danger);
+}
 .ai-enrichment-badge {
   flex: 1;
   min-width: 0;

src/components/ai/TopBar.vue

@@ -538,26 +538,26 @@ onBeforeUnmount(() => {
 .ai-bottom-tools {
   display: flex;
   align-items: center;
-  justify-content: space-between;
+
   padding: 0 14px 4px;
 }
 .ai-bottom-title {
   font-size: 11px;
   color: var(--df-text-secondary);
   min-width: 0;
-  flex: 1;
-  margin-right: 8px;
+  margin-right: auto;
+
 }
 .ai-bottom-tools-right {
   display: flex;
   align-items: center;
   gap: 4px;
   flex-shrink: 0;
+  margin-left: auto;
 }
 /* ═══ Provider Bar (header 中间区) ═══ */
 .ai-provider-bar {
   display: inline-flex;
-  align-items: center;
   gap: 4px;
   font-size: 11px;
   color: var(--df-text-secondary);