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/ToolCard.vue

@@ -42,7 +42,7 @@
         <div v-if="tc.reason" class="ai-tool-approval-reason">⚠ {{ tc.reason }}</div>
         <!-- BUG-260624-02: 审批挂起时长提示(>2分钟橙色,>5分钟红色) -->
         <div v-if="waitSecs > 0" class="ai-tool-wait-time" :class="'is-' + waitLevel">
-          ⏱ 已等待 {{ formatWaitTime(waitSecs) }}
+          ⏱ {{ $t('aiTool.waitTime', { time: formatWaitTime(waitSecs) }) }}
         </div>
         <!-- AE-2025-03: write_file 审批 diff 预览(红删绿增,行级)。旧文件不存在→tc.diff 为空,回退显上方 args content -->
         <div v-if="tc.diff" class="ai-tool-approval-diff">