feat: right-click menus everywhere, workspace/session cost, long-term DB safety

Right-click menus: one portal shell (components/ContextMenu.tsx) for every
item with actions - sidebar/Recents/archived session rows (SessionMenu),
console tabs, pane headers, the Changes panel's files/tree/commits, the
workspace home, sessions outside a workspace (SessionRowMenu: Sessions
table, Dashboard, Activity, Workflow runs), prompt images, every Settings
list and every Claude Code/Codex config list (FileItemMenu). Buttons stay;
a delete keeps its button's confirm; the shell stops portal clicks from
reaching the card that opened it.

Status bar: Workspace $ and Session $ on the Workspace page, from
?lane= on GET /api/pricing/cost and the focused/replayed session's cost.

Database, no data dropped: synchronous=NORMAL, journal_size_limit 64 MB,
hourly PASSIVE checkpoint + PRAGMA optimize, idx_events_session_created
(replacing the redundant idx_events_session), watchdog reads
sessions.transcript_path, transcript parsed before the hook's write
transaction, GET /api/sessions/:id?events=0 for the web page (reloads only
on its own session, debounced), streamed export, transactional clear-data
and chunked cleanup, subagent import reads tool_use_ids once, runtime logs
rotated past 5 MB.

client/src/i18n/locales/vi/lanes.json

@@ -402,5 +402,18 @@
   "panes.newTerminal": "Terminal mới",
   "panes.close": "Đóng pane (session vẫn chạy dưới dạng tab)",
   "panes.resize": "Đổi kích thước pane",
-  "tabs.home": "Trang chủ workspace"
+  "tabs.home": "Trang chủ workspace",
+  "sessionMenu.open": "Mở",
+  "sessionMenu.openSplit": "Mở ở pane chia đôi",
+  "sessionMenu.details": "Chi tiết session",
+  "sessionMenu.copyId": "Sao chép ID session",
+  "sessionMenu.archive": "Lưu trữ",
+  "panes.show": "Hiện {{name}} ở đây",
+  "panes.splitNew.right": "Chia sang phải với terminal mới",
+  "panes.splitNew.bottom": "Chia xuống dưới với terminal mới",
+  "panes.closeShort": "Đóng pane",
+  "changes.copyPath": "Sao chép đường dẫn tương đối",
+  "changes.viewCommit": "Xem commit",
+  "changes.copySha": "Sao chép SHA của commit",
+  "changes.copySubject": "Sao chép commit message"
 }