test(desktop): wait for ready WorkHub layout surface

[Sun-GLiang]

Summary

Wait for the ready WorkHub surface's exact 1 项工作 projection before filling and submitting through its Composer. This prevents the layout E2E from treating the resolving Coordination status surface as submission-ready while preserving the existing result and non-overlap assertions.

Closes #3961

Verification

• Baseline stress loop before the change: 9 failed, 51 passed (--repeat-each=60 --workers=4)
• Focused layout E2E after the change: 20 passed (--repeat-each=20 --workers=1)
• Coordination startup failure/recovery E2E: 1 passed
• npx biome check apps/desktop/e2e/workhub-layout.spec.ts
• npm --workspace @maka/desktop run typecheck

AI use

Select exactly one:

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope: Codex analyzed and reproduced the race, implemented the E2E synchronization change, and ran verification.

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No

[Astro-Han]

Changes the readiness gate in apps/desktop/e2e/workhub-layout.spec.ts from the main landmark to the projected work count 1 项工作, so the test stops filling the Composer while the Coordination status surface is still resolving (#3961).

What I checked:

• The old locator getByRole('main', { name: 'WorkHub' }) becomes visible as soon as the shell mounts, which is strictly before the projection resolves. The new locator targets workCount from workhub-surface.tsx:625, which only renders once the projection has a count. So this is a strictly stronger gate, not a lateral move — it waits for the state the rest of the test actually depends on.
• The assertion still fails if the WorkHub surface never appears, so no coverage is lost by dropping the landmark check; the count only renders inside that surface.
• The preceding block creates exactly one Session, so 1 is the deterministic count rather than an incidental one.
• A hard-coded Chinese string is consistent with this file, which already locates by 重新生成 and fills 支付回调幂等性.

Test-only, no product change. Approving.

AI use: Claude Code (Opus) traced the new locator to the workCount copy in workhub-surface.tsx and checked what the old landmark actually gated on. The stress-loop numbers are the author's, reported and not independently re-run. The reviewer of record reviewed and accepted this.

简体中文

把 apps/desktop/e2e/workhub-layout.spec.ts 的就绪判据从 main landmark 换成投影出来的工作计数 1 项工作，避免在 Coordination 状态面还在解析时就往 Composer 里填内容（#3961）。

核对了四点：

• 旧的 getByRole('main', { name: 'WorkHub' }) 在外壳挂载时就可见，严格早于投影完成；新定位指向 workhub-surface.tsx:625 的 workCount，只有拿到计数才渲染。所以这是更强的判据，不是平移——它等的正是后续步骤真正依赖的状态。
• WorkHub 面若始终不出现，断言仍会失败，去掉 landmark 检查没有损失覆盖，因为计数只在该面内渲染。
• 前一段只创建了一个 Session，所以 1 是确定值而非偶然值。
• 硬编码中文串与本文件既有风格一致（已有 重新生成、支付回调幂等性）。

纯测试改动，无产品行为变化。Approve。