Kanban：补齐看板事件、链接与批量操作闭环 (#634)

* feat(kanban): add board-scoped event stream bridge

* test(kanban): align event refresh expectation

* feat(kanban): add links and partial bulk bridge

* test(kanban): align links bulk refresh expectation

* fix(kanban): treat mutation stderr as failed

tests/client/kanban-view.test.ts

@@ -32,6 +32,8 @@ const mockSetFilter = vi.hoisted(() => vi.fn())
 const mockRecoverSelectedBoard = vi.hoisted(() => vi.fn())
 const mockCreateBoard = vi.hoisted(() => vi.fn())
 const mockArchiveSelectedBoard = vi.hoisted(() => vi.fn())
+const mockStartEventStream = vi.hoisted(() => vi.fn())
+const mockStopEventStream = vi.hoisted(() => vi.fn())
 
 vi.mock('vue-router', () => ({
   useRoute: () => routeState,
@@ -57,6 +59,8 @@ vi.mock('@/stores/hermes/kanban', () => ({
     recoverSelectedBoard: mockRecoverSelectedBoard,
     createBoard: mockCreateBoard,
     archiveSelectedBoard: mockArchiveSelectedBoard,
+    startEventStream: mockStartEventStream,
+    stopEventStream: mockStopEventStream,
   }),
 }))