优化: 前端扫描文案 i18n + parseStack 抽公共 + alert/confirm 换组件

- 扫描/目录状态文案走 $t（Projects/ProjectDetail，zh-CN+en 同步）
- parseStack 抽公共到 src/utils/project.ts（删两份本地实现）
- 8 处原生 alert/confirm 全换（confirm→ConfirmDialog / alert→Arco Message），控制流语义不变

Sprint 20 审查 ⑥⑦⑧。vue-tsc 0 error，验证 safe 0 issue

src/views/Ideas.vue

@@ -193,6 +193,9 @@
         </div>
       </div>
     </div>
+
+    <!-- 确认弹层（删除想法，替代原生 window.confirm） -->
+    <ConfirmDialog :visible="confirmState.visible" :msg="confirmState.msg" @result="answerConfirm" />
   </div>
 </template>
 
@@ -200,14 +203,31 @@
 import { ref, computed, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
 import { useI18n } from 'vue-i18n'
+import { Message } from '@arco-design/web-vue'
 import { useProjectStore } from '../stores/project'
 import { formatDate } from '../utils/time'
+import ConfirmDialog from '../components/ConfirmDialog.vue'
 import type { IdeaRecord } from '../api/types'
 
 const { t } = useI18n()
 const router = useRouter()
 const store = useProjectStore()
 
+// ── 确认弹层（替代原生 window.confirm，后者在 Tauri webview 带 localhost 来源信息无法去除） ──
+const confirmState = ref({ visible: false, msg: '', resolve: null as null | ((v: boolean) => void) })
+function confirmDialog(msg: string): Promise<boolean> {
+  return new Promise(resolve => {
+    confirmState.value.msg = msg
+    confirmState.value.visible = true
+    confirmState.value.resolve = resolve
+  })
+}
+function answerConfirm(ok: boolean) {
+  confirmState.value.visible = false
+  confirmState.value.resolve?.(ok)
+  confirmState.value.resolve = null
+}
+
 type FilterKey = 'all' | 'hot' | 'pending' | 'promoted'
 
 const activeFilter = ref<FilterKey>('all')
@@ -375,7 +395,7 @@ async function confirmCapture() {
 
 async function deleteCurrentIdea() {
   if (!currentIdea.value) return
-  if (!confirm(t('ideas.confirmDelete', { title: currentIdea.value.title }))) return
+  if (!await confirmDialog(t('ideas.confirmDelete', { title: currentIdea.value.title }))) return
   await store.deleteIdea(currentIdea.value.id)
   selectedId.value = null
 }
@@ -388,7 +408,7 @@ async function promoteToProject() {
   } catch (e: any) {
     const msg = e?.toString() ?? t('ideas.promoteFailed')
     console.error(t('ideas.promoteFailed'), e)
-    alert(msg)
+    Message.error(msg)
   }
 }