refactor(frontend): migrate off deprecated Ant Design 6 props

The repo's type-aware deprecation sweep (eslint.deprecated.config.js) reported fourteen findings; it now reports zero. Alert message becomes title and closable+onClose becomes closable.onClose; Select optionFilterProp moves into showSearch.optionFilterProp and suffixIcon becomes suffix; Drawer width becomes size; Progress trailColor becomes railColor. Behavior is unchanged apart from a few single-mode selects gaining type-to-filter, which the old prop already implied.

frontend/src/pages/settings/EmailTab.tsx

@@ -113,8 +113,7 @@ export default function EmailTab({ allSetting, updateSetting }: EmailTabProps) {
                       : <span><b>{stageLabel[testResult.stage || ''] || testResult.stage}:</b> {t('pages.settings.' + testResult.msg)}</span>
                   }
                   showIcon
-                  closable
-                  onClose={() => setTestResult(null)}
+                  closable={{ onClose: () => setTestResult(null) }}
                 />
               )}
             </Space>

frontend/src/pages/settings/TelegramTab.tsx

@@ -233,8 +233,7 @@ export default function TelegramTab({ allSetting, updateSetting }: TelegramTabPr
                   type={testResult.success ? 'success' : 'error'}
                   title={testResult.msg}
                   showIcon
-                  closable
-                  onClose={() => setTestResult(null)}
+                  closable={{ onClose: () => setTestResult(null) }}
                 />
               )}
             </Space>