feat(grid): desktop split-grid watch board — v1 (single/1×2/2×2)

When several sessions are open on a large screen (≥1024px), the terminal
area can split into 1×2 or 2×2 so multiple LIVE, interactive terminals show
at once — a monitoring convenience for vibe-coding several Claude sessions.

Design keeps activeIndex as the single focused pane, so keybar/voice/approval
routing is unchanged; a new gridLayout + derived visible-set lets several
.term-cell wrappers show together inside a CSS-grid #term. The server and WS
protocol are untouched.

- public/grid-layout.ts (new): layout types/capacity, visibleIndices,
  matchMedia desktop gate (GRID_MIN_WIDTH=1024), persistence, toolbar toggle.
- tabs.ts: pane→.term-cell wrapper (header + terminal + inline-approve footer);
  applyLayout() owns show/hide + grid class + cell order + placeholders;
  board-aware activate() (never focuses a hidden pane); setFocused/setGridLayout
  delegate to it; renderCell/renderInlineApprove; refitVisible; notification
  suppression for on-screen panes (factoring in the home overlay).
- terminal-session.ts: show({focus}) so non-focused quadrants don't steal
  keyboard focus; onFocus callback (capture-phase pointerdown).
- main.ts: mount the toggle; window-focus refit → refitVisible.
- style.css: cell/grid model (.term-pane → relative flex child), focus ring,
  pending pulse, inline approve, placeholder, toggle + coarse-pointer targets.
- tests: grid-layout.test.ts + split-grid block in tabs.test.ts (+33).

Adversarial review (4 lenses → per-finding verify) caught and fixed a HIGH:
activate() was not board-aware, so opening a tab on a full grid focused a
hidden pane (typing into an invisible session). Verified: typecheck + build:web
clean, 1566 tests pass, grid-layout 95% / tabs 94% coverage.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/PROGRESS_LOG.md

@@ -24,6 +24,17 @@
 
 > 新会话读到的第一块。保持准确,只描述"此刻"。
 
+### 🖥️ SPLIT-GRID 看板 — 桌面多 session 分屏(2026-07-11,当前活跃)
+- **需求**: web/Mac 大屏、开多个 tab 时,把 `#term` 大窗切成 1×2 / 2×2 宫格,多个 **live 可交互**终端同屏,方便"vibe coding"时盯多个 Claude session。手机不做(<1024px 强制 single)。
+- **分支**: `feat/split-grid-view`(自 `feat/tunnel-automation`)。**用户决策(AskUserQuestion)**:全部阶段(v1→v2→v3)用多 agent + loop 完成;审批用**每格内联 ✓/✗**;成员=**前 N 个 tab(拖拽换序控制)**;布局=**single + 1×2 + 2×2**。
+- **编排**: orchestrator 亲写互锁的 5 文件(并行 builder 会互相踩),每阶段后**并行对抗式 review workflow**(4 lens → 逐条 verify)→ 修 confirmed → 复验绿 → commit → loop 下一阶段。
+- **[x] v1 DONE(2026-07-11)** — orchestrator 独立复验全绿:`npm run typecheck`(前后端两 config)干净、`build:web` 干净、**全套 1566 测试通过**(+33 新增),覆盖率 grid-layout.ts 95%/tabs.ts 94%(≥80 门槛)。
+  - **核心设计**: `activeIndex` 语义**不变**=聚焦格(keybar/voice/approval 全部零改动);新增 `gridLayout` + 派生 `visibleIndices`;每个 pane 包进 `.term-cell`(header + 终端 + 可选内联审批 footer);`applyLayout()` 独占 pane 显隐/grid class/cell 排序/占位符;`#term` 变 CSS grid。**服务端/WS 协议零改动**。
+  - **文件**: 新 `public/grid-layout.ts`(纯逻辑 + matchMedia 门 + 持久化 + toolbar 分段控件)、`tabs.ts`(applyLayout/renderCell/renderInlineApprove/setFocused/setGridLayout/refitVisible + `activate()` 改为**board-aware**)、`terminal-session.ts`(`show({focus})` 防 4 格抢焦点 + `onFocus` 回调)、`main.ts`(挂 toggle + refitVisible)、`style.css`(cell/grid/焦点环/pending 脉冲/内联审批/占位符/toggle + `.term-pane` 改 position:relative flex 子)。新测 `test/grid-layout.test.ts` + `tabs.test.ts` 追加 split-grid 块。
+  - **交叉验证抓修 3 真缺陷**:**HIGH** — `activate()` 原先非 board-aware:满格(4/4)时点 "+" 会让新 tab 成为 activeIndex 但 `display:none`,用户对着看不见的 session 打字(空最常见路径触发)。修:把 off-board→moveTab 上板逻辑折进 `activate()`,`setFocused`/`setGridLayout` 委托之。**LOW** — 通知抑制未算 `homeForced`(⌂ 覆盖时 pane 实际不在屏);修:`onScreen = !homeForced && isVisible`。**LOW** — toggle 触控尺寸(coarse-pointer 平板);修:`@media (pointer:coarse)` 加大。全部补了回归测试。
+- **[~] 下一步**: v2(1×3/2×3 布局、拖 tab 到格、Ctrl+` 循环焦点、单格最大化)→ v3(可拖拽分隔条、只读 monitor 格走 `/live-sessions/:id/preview` 免共享 PTY 缩放、布局预设)。
+- **探索产物**: 交互式原型 artifact(single/1×2/2×2 切换、点击移焦、内联审批)已给用户看过并据此拍板方向。
+
 ### 🔐 TUNNEL AUTOMATION — 零接触隧道注入(客户永不碰证书/密钥;2026-07-08)
 - **计划**: [PLAN_TUNNEL_AUTOMATION.md](./PLAN_TUNNEL_AUTOMATION.md)(design-locked)。目标:host 一条命令 onboard、device 登录一次即在硬件里生成不可导出密钥→CSR→拿证书,**无 .p12/AirDrop,私钥永不离设备**。三轨:A 控制面/PKI、B host agent、C 原生客户端(iOS/Android/desktop)。基础设施(frps/device-CA/frp-client-CA/nginx:8470 mTLS)已在 VPS M1 上线;本工作流建的是**自动化**(签发端点、njs cert→Host 绑定、硬件 keygen、host onboard)。
 - **分支**: `feat/tunnel-automation`(自 develop)。走 **MVP fast-path §7**(10 个 tracked task,见任务表 #1–#10),依赖图强制:A1 crypto → A2 契约 → A3 nginx 绑定为顺序地基,之后按职责(backend/host/iOS)扇出。