B4 frontend: probe task management modal on the nodes page

- ProbeTasksModal: self-loading/self-saving surface (B3 probe-meta
  pattern), tasks grouped by region label (ungrouped last), editor
  with name/region/target/interval/auto-join + agent-node multi
  select snapshotting baseNodeIds for the base-diff save; delete
  with confirm. Toolbar entry on NodeList (RadarChart icon), wired
  in NodesPage; NodeList call sites in two component tests updated
  for the new required prop.
- i18n pages.nodes.probeTasks.* (25 keys) in all 13 locales: zh-CN
  translated, en-US English, others English placeholder per repo
  convention; insertion verified pure-additive (351 insertions,
  0 deletions) and the i18n dead-key failures are byte-identical
  to the B3 baseline.
- tsc clean; oxlint 0/0 (baseline parity); oxfmt clean on touched
  files (3 pre-existing drift files untouched).

frontend/src/pages/nodes/NodeList.tsx

@@ -27,6 +27,7 @@ import {
   InfoCircleOutlined,
   MoreOutlined,
   PlusOutlined,
+  RadarChartOutlined,
   RightOutlined,
   SafetyCertificateOutlined,
   TeamOutlined,
@@ -48,6 +49,7 @@ interface NodeListProps {
   onSelectionChange: (ids: number[]) => void;
   onAdd: () => void;
   onMtls: () => void;
+  onProbeTasks: () => void;
   onEdit: (node: NodeRecord) => void;
   onDelete: (node: NodeRecord) => void;
   onProbe: (node: NodeRecord) => void;
@@ -218,6 +220,7 @@ export default function NodeList({
   onSelectionChange,
   onAdd,
   onMtls,
+  onProbeTasks,
   onEdit,
   onDelete,
   onProbe,
@@ -618,6 +621,9 @@ export default function NodeList({
         <Button icon={<SafetyCertificateOutlined />} onClick={onMtls}>
           {t('pages.nodes.mtls.title')}
         </Button>
+        <Button icon={<RadarChartOutlined />} onClick={onProbeTasks}>
+          {t('pages.nodes.probeTasks.title')}
+        </Button>
         {selectedIds.length > 0 && (
           <Button icon={<CloudDownloadOutlined />} onClick={onUpdateSelected}>
             {t('pages.nodes.updateSelected', { count: selectedIds.length })}