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).

server/data/ai-tools/cursor.json

@@ -1,6 +1,6 @@
 {
   "id": "cursor",
-  "label": "Cursor",
+  "label": "Cursor CLI",
   "detect": [
     "cursor-agent"
   ],
@@ -10,6 +10,9 @@
   "model": {
     "flag": "--model"
   },
+  "resume": [
+    "--continue"
+  ],
   "bypass": [
     "--yolo"
   ],
@@ -20,7 +23,10 @@
     "url": "https://cursor.com/install"
   },
   "update": {
-    "kind": "script"
+    "kind": "self",
+    "args": [
+      "update"
+    ]
   },
   "config": [
     {