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/lib/api.ts

@@ -681,6 +681,10 @@ export const api = {
       cwd?: string;
       /** One CLI's sessions only (`claude`, `codex`, `antigravity`). */
       tool?: string;
+      /** The sessions this workspace owns (`sessions.lane_id`). */
+      lane?: number;
+      /** `false` = not archived, `true` = archived only; omitted = both. */
+      archived?: boolean;
       sort_by?: string;
       sort_desc?: boolean;
       limit?: number;
@@ -692,6 +696,8 @@ export const api = {
       if (params?.q) qs.set("q", params.q);
       if (params?.cwd) qs.set("cwd", params.cwd);
       if (params?.tool) qs.set("tool", params.tool);
+      if (params?.lane !== undefined) qs.set("lane", String(params.lane));
+      if (params?.archived !== undefined) qs.set("archived", params.archived ? "1" : "0");
       if (params?.sort_by) qs.set("sort_by", params.sort_by);
       // `!== undefined` (not truthiness) so an explicit `sort_desc: false` is preserved.
       if (params?.sort_desc !== undefined) qs.set("sort_desc", String(params.sort_desc));
@@ -733,6 +739,13 @@ export const api = {
      * @returns {@link SessionStats} for that one session.
      */
     stats: (id: string) => request<SessionStats>(`/sessions/${encodeURIComponent(id)}/stats`),
+    /** PATCH /api/sessions/:id — rename, or archive (hides it from its
+     *  workspace, deletes nothing). */
+    patch: (id: string, body: { name?: string; archived?: boolean }) =>
+      request<{ session: Session }>(`/sessions/${encodeURIComponent(id)}`, {
+        method: "PATCH",
+        body: JSON.stringify(body),
+      }),
     /**
      * GET /api/sessions/:id/transcripts - the picker list of available
      * transcripts (main agent, subagents, compaction markers) for this session.