style: satisfy the eslint lane on the plan surfaces

Drop the assertions eslint proved unnecessary (getByRole gains the element
type parameter instead, keeping tsc satisfied), declare the injected
setPlanMode as a function property (the seat face is this-free), and narrow
the fixture's command args without String()'s object stringification arm.

packages/client/ui-question/tests/question-composer.spec.tsx

@@ -119,7 +119,7 @@ describe('QuestionComposer', () => {
           detail: '# 实施计划\n\n- **先验证**现状\n- 修改 `QuestionComposer`',
           options: [{ label: '批准' }],
         }],
-      } as PendingWait<'question'>['payload'],
+      },
       vi.fn(),
     )
     const view = render(<QuestionComposer matched={carrier} interactions={[carrier]} {...kit} />)