test(web): restore coverage baseline above gate (63.14 -> 66.72 lines)

[DeliciousBuding]

背景

validate job 的 coverage baseline gate 挂：agenthub-web 与 agenthub-desktop 全指标回归（web lines 63.14 < 63.61 等）。

修复内容

web（3 文件，+304 行测试）

• executionTargetQueries.test.ts / hubAuth.test.ts：扩展 API 层测试
• toastStore.test.ts（新增）：覆盖 addToast/showToast/dismissToast/removeToast + 自动消失/上限 5/不可变

desktop（3 文件，新增）

• hubAuth.contract.test.ts / useAuth.test.ts / useDesktopCommands.behavior.test.ts

结果（本地 vitest --coverage）

指标	修复前	修复后	baseline
web lines	63.14	66.72	63.61
web statements	61.93	65.61	62.19
web functions	52.11	55.72	53.42
web branches	58.82	60.26	59.48

全部指标 ≥ baseline（未降低任何阈值），desktop 同组测试也超过其 baseline。

验证

web + desktop 测试全过（1737 passed, 0 failed, 0 skipped）。

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📥 Commits

Reviewing files that changed from the base of the PR and between 1d2feff and 260e24f.

📒 Files selected for processing (7)

• .gitignore
• app/desktop/src/api/hubAuth.contract.test.ts
• app/desktop/src/hooks/useAuth.test.ts
• app/desktop/src/hooks/useDesktopCommands.behavior.test.ts
• app/web/src/api/executionTargetQueries.test.ts
• app/web/src/api/hubAuth.test.ts
• app/web/src/stores/toastStore.test.ts

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