feat(v0.6): kill a session directly from the Projects grid cards

The detail view could kill sessions, but the grid card's session rows were
enter-only. Add a ✕ kill button to each card session row (stopPropagation so it
doesn't also enter the session); makeSessionRow gains an optional onKill,
makeProjectCard an optional onKillSession, and mountProjects wires it to
DELETE /live-sessions/:id followed by a refresh.

Frontend-only. projects-panel tests +1 (51): ✕ present only with the callback,
click kills the right id without entering. Verified in-browser: a card with 2
sessions dropped to 1 after clicking ✕.

docs/PROGRESS_LOG.md

@@ -146,6 +146,15 @@
 - **commit**: <hash 或 N/A>
 ======================================================= -->
 
+### 2026-06-30 · v0.6 项目网格卡片 — 直接关掉 session
+
+- **状态**: `[x]` DONE。51 projects-panel 测试全绿(+1)· web typecheck 干净 · `build:web` OK · 真浏览器验证通过。
+- **需求**(用户): Projects 页面(网格卡片)下应该能直接关掉 session(此前只有详情页有 Kill,卡片 session 行只能点进入)。
+- **改动**(纯前端 `public/projects.ts` + style): `makeSessionRow` 加可选 `onKill` → 行尾 ✕ 按钮(`.proj-session-kill`,stopPropagation 不触发进入);`makeProjectCard` 加可选 `onKillSession` 透传;`mountProjects` 加 `killAndRefresh`(`DELETE /live-sessions/:id` 后 refresh)传入网格卡片。CSS `.proj-session-kill`(hover 变红)。
+- **测试**(+1): 卡片 session 行——无 onKillSession 时无 ✕;有时点 ✕ 调 onKill(id) 且不触发 onEnterSession。
+- **验证**: `npx tsc -p tsconfig.web.json` 干净;`npx vitest run projects-panel` 51/51;真浏览器:web-terminal 卡 2 个 session 行 → 点 ✕ → 杀掉并刷新为 1 行。
+- **commit**: (本次提交)
+
 ### 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。