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/PricingSettings.tsx

@@ -12,6 +12,7 @@
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
+import { Checkbox } from "../Checkbox";
 import { useEffect, useState, useCallback, useRef, Fragment } from "react";
 import { useTranslation } from "react-i18next";
 import { DollarSign, Plus, Pencil, Trash2, Check, X, RotateCcw, Info } from "lucide-react";
@@ -571,15 +572,11 @@ export function PricingSettings({ vendor, allowReset = false, id = "pricing" }:
         </div>
         <div className="flex items-center gap-2">
           {hidden > 0 && (
-            <label className="inline-flex items-center gap-1.5 text-xs text-fg-secondary cursor-pointer select-none">
-              <input
-                type="checkbox"
-                checked={showAll}
-                onChange={(e) => setShowAll(e.target.checked)}
-                className="accent-current"
-              />
-              {t("pricing.showAll", { count: hidden })}
-            </label>
+            <Checkbox
+              checked={showAll}
+              onChange={setShowAll}
+              label={t("pricing.showAll", { count: hidden })}
+            />
           )}
           {allowReset && (
             <button