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/components/settings/SettingsRow.tsx

@@ -7,6 +7,7 @@
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
+import { Switch } from "../Switch";
 import type { ReactNode } from "react";
 
 export function SettingsSection({
@@ -70,25 +71,7 @@ export function SettingsSwitchRow({
     <SettingsRow
       label={label}
       description={description}
-      control={
-        <button
-          type="button"
-          role="switch"
-          aria-checked={checked}
-          aria-label={label}
-          disabled={disabled}
-          onClick={() => onChange(!checked)}
-          className={`relative inline-flex h-5 w-9 rounded-full border-2 border-transparent transition-colors disabled:opacity-50 ${
-            checked ? "bg-accent" : "bg-surface-4"
-          }`}
-        >
-          <span
-            className={`pointer-events-none inline-block h-4 w-4 rounded-full bg-white shadow transition-transform ${
-              checked ? "translate-x-4" : "translate-x-0"
-            }`}
-          />
-        </button>
-      }
+      control={<Switch checked={checked} onChange={onChange} label={label} disabled={disabled} />}
     />
   );
 }