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/lanes/LaneGitBar.tsx

@@ -22,6 +22,7 @@
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
+import { Checkbox } from "../Checkbox";
 import { useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
 import {
@@ -516,14 +517,7 @@ export function LaneGitBar({
               className="min-w-0 flex-1 rounded border border-border-light bg-surface-0 px-2 py-0.5 text-fg-primary placeholder:text-fg-muted focus:border-accent focus:outline-none"
             />
           </div>
-          <label className="flex items-center gap-1.5 text-fg-secondary">
-            <input
-              type="checkbox"
-              checked={remember}
-              onChange={(e) => setRemember(e.target.checked)}
-            />
-            {t("gitBar.loginRemember")}
-          </label>
+          <Checkbox checked={remember} onChange={setRemember} label={t("gitBar.loginRemember")} />
           <p className="text-[10px] text-fg-muted">{t("gitBar.loginTokenHint")}</p>
           {/* The token crosses the network in the clear on a plain-http LAN address. */}
           {location.protocol === "http:" && !LOCAL_HOST.test(location.hostname) && (