feat: workspaces own their sessions; desktop parity; sidebar and settings cleanup

Workspace sessions (docs/plans/desktop-parity, phases 1-5 and 7):
- sessions.lane_id: a workspace lists only the sessions its panes held,
  stamped by bindRunSession (first writer wins, nested `claude -p`
  excluded); GET /api/sessions?lane=&archived=
- session row state dot, double-click rename, archive (sessions.archived_at,
  hides only); the activity bar's duplicate Sessions tab removed
- Fork beside Resume (--fork-session, Claude only), Ctrl/Cmd+click a live
  session opens it in a second pane, a diff line's comment is pasted into
  the workspace's last-focused pane (lib/panePaste.ts)

dashboard_runs stability:
- a pane's previous run is archived as <pane>@<started_at> instead of being
  overwritten by INSERT OR REPLACE
- a run is flagged abandoned only once its tmux session is gone, at boot and
  on the run-heal beat (panes outlive a server restart)

UI:
- sidebar: no footer, language or theme block; small collapse button in the
  brand corner; version + update check in the connection details modal, a
  status-bar dot while a release is out; language in Settings -> General
- one Switch component for every switch, the themed Checkbox for every
  checkbox (no native checkboxes)

Also: AI Tools catalog trimmed to 10 built-ins (custom-file prompt modes
tested through fixtures), and the workspace plans under docs/plans/ (the
multi-user server plan lives in the AgentHub-Server repo).

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

@@ -11,7 +11,6 @@
   "checkingForUpdates": "Đang kiểm tra cập nhật...",
   "close": "Đóng",
   "collapse": "Thu gọn thanh bên",
-  "collapseShort": "Thu gọn",
   "connection": "Kết nối",
   "connectionDetails": "Chi tiết kết nối",
   "connectionUptime": "Đã kết nối",
@@ -49,14 +48,6 @@
   "settings": "Cài đặt",
   "skipToContent": "Bỏ qua đến nội dung",
   "statsPersisted": "Số liệu được lưu sau khi tải lại",
-  "switchLanguage": "Chuyển sang {{language}}",
-  "switchTheme": "Chuyển sang {{theme}}",
-  "theme": "Giao diện",
-  "themeNames": {
-    "dark": "Tối",
-    "light": "Sáng",
-    "system": "Theo hệ thống"
-  },
   "throughput60s": "Lưu lượng · 60s qua",
   "topEventTypes": "Loại sự kiện phổ biến",
   "unitEvents": "sự kiện",
@@ -74,5 +65,6 @@
     "running": "{{count}} đang chạy",
     "needYou": "{{count}} cần bạn",
     "today": "Hôm nay {{cost}}"
-  }
+  },
+  "version": "Phiên bản"
 }