test(shared): hubClientPayloadRequestsSocial + PayloadPaths + chatview adapter 补 137 个单元测试（Lane D #1764 第七批）

[DeliciousBuding]

Summary

延续 #1765–#1773，落地 Lane D 前端测试补债 (#1764) 第七批：给 3 个纯逻辑模块补 137 个单元测试。不改任何产品代码。

为什么选它

• hubClientPayloadRequestsSocial.ts（367 行）：27 个 social 请求 builder，optional 字段存在性（hasOwnProperty vs undefined）是回归风险点。
• hubClientPayloadPaths.ts（471 行）：96 个 path builder，qs/URLSearchParams 语义（0/false/'' 保留、null/undefined 跳过）与 percent-encoding 边界。
• chatview/adapter.ts（327 行）：transcript→chatview 适配核心；resolveCompactDividerIndices 此前零覆盖。

覆盖范围

• social（+23）：27 个 builder、optional message 存在性、method-only bodyless、编码（CJK/emoji/斜杠）、seq 边界
• paths（+27）：96 个 builder 全量、qs 假值保留、空串 id 双斜杠、unicode、publicCatalog 参数覆盖
• adapter（+87）：blocksToTranscriptItems 全分支（agent_timeline 展平/run_step_group 递归/tool call-result 合并）+ resolveUnreadAnchorItemIndex（12）+ resolveCompactDividerIndices（13，首次覆盖）

Test plan

• vitest run 新文件 — 137/137 通过
• tsc --noEmit 全包 0 错误
• CI 前端测试 job 通过

关联

• 里程碑：简化做减法 · Simplify & Slim Down (Do not dispatch agent tasks with the HTTP request context #100)
• Lane D 测试补债：[P1] 前端测试补债：shared/workbench 核心 store/hook/util 单元测试 #1764（第七批）
• real_tested=true：纯逻辑单测

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📥 Commits

Reviewing files that changed from the base of the PR and between 3737cdd and b638db0.

📒 Files selected for processing (3)

• app/shared/src/chatview/adapter.test.ts
• app/shared/src/hub/hubClientPayloadPaths.test.ts
• app/shared/src/hub/hubClientPayloadRequestsSocial.test.ts

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