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/run/LaneConsolePane.tsx

@@ -86,10 +86,6 @@ export interface LaneConsolePaneProps {
   hiddenRunIds?: string[];
   /** Reports the run this pane shows (null on the setup form). */
   onHandleChange?: (runId: string | null) => void;
-  /** A session to resume in this pane, from the Workspace's Sessions tab. A new
-   *  `nonce` is a new request; it goes through the same path as a resume from
-   *  the run history, live-run fallback included. */
-  resumeRequest?: { sessionId: string; model: string | null; nonce: number } | null;
   /** A live run to show in this pane (a session picked in the sidebar). It
    *  attaches to that tmux session only — nothing is started or resumed. */
   attachRequest?: { runId: string; nonce: string } | null;
@@ -116,7 +112,6 @@ export function LaneConsolePane({
   slot = 0,
   hiddenRunIds,
   onHandleChange,
-  resumeRequest,
   attachRequest,
 }: LaneConsolePaneProps) {
   const { t } = useTranslation("run");
@@ -492,23 +487,6 @@ export function LaneConsolePane({
     [busy, refreshList, t, lanes, slot, onLaneCreated, onLaneIdChange, attachToRun]
   );
 
-  const resumeRef = useRef(onResumeFromHistory);
-  resumeRef.current = onResumeFromHistory;
-  useEffect(() => {
-    const lane = latest.current.lanes.find((l) => l.id === laneId);
-    if (!resumeRequest || !lane) return;
-    void resumeRef.current({
-      session_id: resumeRequest.sessionId,
-      cwd: lane.cwd,
-      tool: lane.tool,
-      model: resumeRequest.model,
-      permission_mode: null,
-      effort: null,
-    } as DashboardRunHistoryItem);
-    // Only a new request (nonce) resumes; a lane switch never replays one.
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [resumeRequest?.nonce]);
-
   const onViewFromHistory = useCallback(
     (item: DashboardRunHistoryItem) => {
       if (item.session_id) void onResumeFromHistory(item);