优化: i18n硬编码清扫(8文件20+处中文字符串替为i18n)

- ToolCard: 已等待 → aiTool.waitTime

- ErrorBoundary: 堆栈详情 → error.stackDetails

- TopBar: 10处硬编码(tooltip+section标签+单位) → aiChat.* keys

- FileExplorer: 4处工程操作title → fileExplorer.*

- Tasks: 快捷菜单4处 → tasks.*

- EnrichmentPanel: 取消关联 → aiChat.enrichmentDismiss

- PlanProgress: 复用已有 aiChat.conflictsPending

- WorkflowDagDisplay: 删除中文fallback(已有i18n key)

- vue-tsc + vite build 通过

src/components/ai/EnrichmentPanel.vue

@@ -51,7 +51,7 @@ function toggleExpanded(current: boolean) {
       </svg>
       <span class="ai-enrichment-badge">{{ enrichmentBadgeText }}</span>
     </button>
-    <button class="ai-enrichment-dismiss" @click="emit('dismiss')" title="取消关联">×</button>
+    <button class="ai-enrichment-dismiss" @click="emit('dismiss')" :title="$t('aiChat.enrichmentDismiss')">×</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>