feat(license): 退出授权文案精简与两态布局

未授权隐藏退出；Pro+管理员可见「退出授权」；成功只 reload 授权态不整页刷。

frontend/src/i18n/locales/en/license.ts

@@ -21,10 +21,11 @@ export default {
   activating: 'Activating…',
   activated: 'Pro activated — all features unlocked',
   activateFailed: 'Activation failed',
-  deactivate: 'Deactivate / release this instance',
+  deactivate: 'Deactivate license',
   deactivateConfirmTitle: 'Deactivate license?',
-  deactivateConfirmDesc: 'This releases the seat for this instance and returns the machine to Free. Online keys notify the license server first; on failure local state is kept (never silently cleared).',
+  deactivateConfirmDesc: 'This machine returns to Free. Online keys notify the server first; on failure local state is kept.',
   deactivateConfirm: 'Confirm deactivate',
+  graceBadge: 'Grace {{days}}d',
   deactivating: 'Deactivating…',
   deactivated: 'License deactivated — this machine is Free again',
   deactivateFailed: 'Deactivation failed',