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/i18n/en/aiTool.ts

@@ -8,6 +8,8 @@ export default {
     rejectedHint: 'User rejected this action',
     // B-260616-12: tool execution slow hint (frontend fallback, no backend cancel IPC)
     executionSlow: 'Tool "{name}" is taking longer than expected, please wait…',
+    // BUG-260624-02: approval pending duration hint (>2min orange, >5min red)
+    waitTime: '⏱ Waiting {time}',
     // UX-260616-01: tool execution failure marker (AR-6 keeps status=completed, red to distinguish from success)
     executionFailed: 'Failed',
     executionFailedHint: 'Tool execution failed, see details below',