feat: workspace aliases, tab groups of split panes, native path picker (v2.1.0)

- /api/workspaces and `agenthub workspace(s)` / `--workspace` as aliases of
  /api/lanes and `agenthub lanes` / `--lane`; old names print one stderr note.
  REPL `help lanes|workspace|workspaces` resolves through the aliases.
- A workspace holds up to ten sessions (slots 0-9); every console tab is a
  group of 1-4 split panes (PaneGroups, agenthub.workspace.paneLayout);
  parseGroups keeps the stored active tab when an earlier one is dropped.
- Browse button beside path fields: POST /api/lanes/pick-path opens the OS
  picker on the server's desktop — loopback only and no forwarding header
  (EREMOTE), a display failure is ENODIALOG not a Cancel, the dialog is
  killed when the request closes, a folder field falls back to the in-app
  browser on any failure.
- Changes rail counts chip, image viewer (/git/raw), status bar session
  counts and per-day cost (`date=` on /api/pricing/cost).
- /agenthub-open and /agenthub-doctor run from the INSTALLED build
  (supersededBy), doctor offers fixes behind two confirmations; plugin-open
  treats a locked bootstrap as non-fatal.
- New-terminal shell waits for the first attach (issue #55).
- repo-onboarding / debug-live-issue skills removed.
- OpenAPI: pick-path, lane/date on /pricing/cost, tool on /run/history,
  /api/workspaces mount.

client/src/pages/Dashboard.tsx

@@ -2870,6 +2870,14 @@ export function Dashboard() {
           </div>
         </div>
         <div className="flex items-center gap-3">
+          {/* Monitor's Refresh sits LEFT of the tabs: on their right it pushed
+              Analytics/Monitor/Health aside every time Monitor opened.
+              Analytics and Health carry their own Refresh; one per view. */}
+          {monitorOn && (
+            <button onClick={load} className="btn-ghost flex-shrink-0">
+              <RefreshCw className="w-4 h-4" /> {t("common:refresh")}
+            </button>
+          )}
           {/* Tabs */}
           <div
             role="tablist"
@@ -2892,12 +2900,6 @@ export function Dashboard() {
               </button>
             ))}
           </div>
-          {/* Analytics and Health carry their own Refresh; one per view. */}
-          {monitorOn && (
-            <button onClick={load} className="btn-ghost flex-shrink-0">
-              <RefreshCw className="w-4 h-4" /> {t("common:refresh")}
-            </button>
-          )}
         </div>
       </div>