feat(v0.6): per-project detail view — branch/worktrees + active sessions

Clicking a project's name opens an in-app detail view (back button returns to
the grid) with:
- header: name, path, branch, dirty
- Branch / Worktrees: each `git worktree list` entry (branch or detached@head,
  main/current/locked/prunable tags, path) — a single-worktree repo shows its
  branch; a multi-worktree repo shows them all
- Active sessions (N): detailed rows (status, devices watching, started-ago)
  with Open + Kill
- the Claude/Codex/VS Code launcher row

Backend: src/http/worktrees.ts (parseWorktrees pure + listWorktrees via
execFile, no shell, best-effort); buildProjectDetail(cfg, path, liveSessions)
in projects.ts (validates absolute existing dir, reuses branch/dirty/session
helpers, uncached — detail is on-demand and wants fresh state); read-only
GET /projects/detail?path= (no Origin guard, like /projects; 400 missing /
404 invalid). Types: WorktreeInfo, ProjectDetail.

Frontend: detail view + navigation in projects.ts (grid<->detail), project
name becomes a link, Kill via DELETE /live-sessions/:id.

Tests +21 (452 total): worktree parser, buildProjectDetail (validation,
non-git, session merge, real git-init worktree), renderProjectDetail.
worktrees.ts 100% / projects.ts 93.8% cov. Verified in-browser: opened a
Claude session, then the detail showed its branch+worktree and the live
session with Open/Kill.

docs/PROGRESS_LOG.md

@@ -146,6 +146,18 @@
 - **commit**: <hash 或 N/A>
 ======================================================= -->
 
+### 2026-06-30 · v0.6 项目详情页 — branch/worktree + 详细 active session
+
+- **状态**: `[x]` DONE。**452 测试全绿**(+21)· 双 typecheck 干净 · `build:web` OK · 覆盖率 90.16/81.32(`worktrees.ts` 100% / `projects.ts` 93.8%)· 真端到端(curl + 真浏览器)验证通过。
+- **需求**(用户): 每个 project 的**详情页**——详细显示具体 active 的 session,以及具体的 **branch 或 worktree**。
+- **设计**: 点项目卡的**名字**进入应用内详情视图(`renderProjectDetail`,在 Projects 面板内切换,带"← All projects"返回)。分区:① 头部(名/路径/branch chip/dirty)② **Branch / Worktrees**(`git worktree list` 每条:branch 或 `detached @ head` + main/current/locked/prunable 标签 + 路径;单 worktree 即显示分支)③ **Active sessions(N)**(每条:状态点 + 标题 + `状态·👁设备数·started 多久前` + **Open** + **Kill ✕**)④ **Start** 启动器行(复用 Claude/Codex/Code)。再进 Projects 总是回到网格(不残留详情)。
+- **后端**: 新增 `src/http/worktrees.ts`(`parseWorktrees`(纯)+ `listWorktrees`,`git worktree list --porcelain`,execFile 无 shell,2s 超时,best-effort→[]);`projects.ts` 加 `buildProjectDetail(cfg, path, liveSessions)`(校验绝对存在目录→否则 null;复用 readBranch/readDirty/hasGitEntry/matchSessions;**不缓存**,详情按需要新鲜)。`src/server.ts` `GET /projects/detail?path=`(只读、无 Origin 守卫,同 /projects;path 缺→400、非法/不存在→404)。types 加 `WorktreeInfo`/`ProjectDetail`。
+- **前端**(`public/projects.ts` + style): `fetchProjectDetail`/`killSession`;`makeProjectCard` 加可选 `onOpenDetail`(名字变可点链接 `.proj-name-link`);`mountProjects` 加 grid↔detail 视图切换 + 自动刷新路由(详情每 5s 刷新);Kill 走 `DELETE /live-sessions/:id`(同源带 Origin)。详情视图样式 `.proj-detail*`/`.proj-wt-*`/`.proj-dsession*`。session meta 在 status=unknown 时省略状态点(不显示 `· ·`)。
+- **测试**(+21): `test/worktrees.test.ts`(parse:单/多/detached/locked/prunable/无尾空行/空);`projects.test.ts` buildProjectDetail(相对/不存在/文件→null、非 git 目录、假 repo 读 branch、session 按 cwd 前缀归并、**真 git init worktree**(realpath 规避 /var symlink));`projects-panel.test.ts` renderProjectDetail(null→not found+Back、头部、worktree 行+current tag、detached、session Open/Kill 接线+忽略 exited、空态+启动器、非 git)+ 名字链接。
+- **验证**: `npx tsc`(双)干净;`npx vitest run --coverage` 452/452(≥80×4);真浏览器:开 web-terminal 的 Claude session→进详情→显示 branch `v0.6-projects`(MAIN/CURRENT)+ Active sessions(1)(web-terminal,👁1,Open/✕)+ Start 启动器 + 返回。curl `/projects/detail` 返回 worktree(main/current/head)+ 缺/相对 path→400/404。
+- **安全**: `/projects/detail` 只读(git branch/status/worktree-list,execFile 无 shell + 超时),path 校验绝对存在目录;与 /projects 同威胁模型(不新增可变更面)。
+- **commit**: (本次提交)
+
 ### 2026-06-30 · v0.6 项目卡启动器 — Claude · Codex · VS Code logo 按钮
 
 - **状态**: `[x]` DONE。覆盖率 90.6/81.48/88.71/92.71(≥80×4)· 双 typecheck 干净 · `build:web` OK · 真浏览器 + 真 VS Code 端到端验证通过。