fix(desktop): stabilize Runtime Host Session lifecycle races

[M4n5ter]

English

Summary

Stabilize two Desktop lifecycle paths that could race with Runtime Host Session revision changes:

• stop an active side-conversation Turn before retiring its durable Session copy, instead of relying on later catalog reads to recover cleanup;
• allow Session updates and removals a larger but still bounded CAS resynchronization window, rebuilding each request from a fresh Host projection.

The side-chat E2E now dismisses a Turn that deliberately remains active, so it verifies the production stop-before-retire contract. The Session client regression crosses four consecutive revision conflicts before committing, which reproduces the window that exceeded the previous three-attempt bound.

Fixes #2543
Fixes #2545

Verification

• npx biome check on all changed files
• npm run typecheck --workspace @maka/desktop --if-present
• npm run build:test
• focused Desktop unit tests: 50 passed
• complete Desktop unit suite: 1,131 passed
• affected Desktop E2E tests: 20/20 repeated runs passed, then 2/2 passed after rebasing onto current main

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

中文

摘要

修复两条会与 Runtime Host Session revision 变化发生竞态的 Desktop 生命周期路径：

• 关闭侧边对话时，先停止仍在运行的 Turn，再退休其持久化 Session 副本，不再依赖后续 catalog 读取碰巧驱动清理；
• 为 Session 更新与删除提供更大的、但仍有界的 CAS 重同步窗口，并在每次重试时从 Host 的最新投影重建请求。

侧边对话 E2E 现在会关闭一个刻意保持运行的 Turn，因此能验证生产路径的“先停止、后退休”契约。Session client 回归测试则会连续经历四次 revision conflict 后再提交，覆盖原三次尝试上限不足的窗口。

修复 #2543
修复 #2545

验证

• 对全部改动文件运行 npx biome check
• npm run typecheck --workspace @maka/desktop --if-present
• npm run build:test
• Desktop 定点单测：50 项通过
• Desktop 完整单测：1,131 项通过
• 相关 Desktop E2E：重复运行 20/20 通过；rebase 到最新 main 后再次运行 2/2 通过

检查清单

• 测试覆盖改动，并会在缺少修复时失败
• lint、format、typecheck 与相关测试套件均已在本地通过

此 PR 是否包含行为变化？

• 是——已在摘要中说明
• 否