fix(ui/clipboard): surface fallback copy failure + unify PreflightInstallDialog

mateclaw-ui/src/components/skill/PreflightInstallDialog.vue

@@ -79,6 +79,7 @@ import { computed, ref, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { ElMessage } from 'element-plus'
 import { skillApi } from '@/api/index'
+import { copyToClipboard } from '@/utils/clipboard'
 
 interface RequirementStatus {
   key: string
@@ -146,21 +147,7 @@ function handleClose() {
 
 async function copy(cmd: string) {
   try {
-    if (navigator.clipboard) {
-      await navigator.clipboard.writeText(cmd)
-    } else {
-      // Fallback for clipboard-API-disabled contexts (eg http://). The
-      // textarea trick is broadly supported and avoids a noisy permission
-      // failure on the production-ish workflow.
-      const ta = document.createElement('textarea')
-      ta.value = cmd
-      ta.style.position = 'fixed'
-      ta.style.left = '-9999px'
-      document.body.appendChild(ta)
-      ta.select()
-      document.execCommand('copy')
-      document.body.removeChild(ta)
-    }
+    await copyToClipboard(cmd)
     ElMessage.success(t('common.copied'))
   } catch {
     ElMessage.warning(t('common.copyFailed'))

mateclaw-ui/src/utils/clipboard.ts

@@ -13,6 +13,7 @@ export async function copyToClipboard(text: string): Promise<void> {
   ta.style.left = '-9999px'
   document.body.appendChild(ta)
   ta.select()
-  document.execCommand('copy')
+  const ok = document.execCommand('copy')
   document.body.removeChild(ta)
+  if (!ok) throw new Error('Clipboard copy command failed')
 }